Relevant bibliographies by topics / U-Pb

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  2. Dissertations / Theses
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  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'U-Pb'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "U-Pb"

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Iwano, H., Y. Orihashi, M. Ogasawara, and T. Hirata. "Zircon multichronology: Fission-track, U-Pb, and combined fission-track-U-Pb studies." Island Arc 22, no. 3 (August 28, 2013): 261–63. http://dx.doi.org/10.1111/iar.12042.

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Yang, Wei, Yang-Ting Lin, Jian-Chao Zhang, Jia-Long Hao, Wen-Jie Shen, and Sen Hu. "Precise micrometre-sized Pb-Pb and U-Pb dating with NanoSIMS." Journal of Analytical Atomic Spectrometry 27, no. 3 (2012): 479. http://dx.doi.org/10.1039/c2ja10303f.

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Jahn, Bor-ming, and Henri Cuvellier. "PbPb and UPb geochronology of carbonate rocks: an assessment." Chemical Geology 115, no. 1-2 (July 1994): 125–51. http://dx.doi.org/10.1016/0009-2541(94)90149-x.

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Sharman, Glenn R., and Matthew A. Malkowski. "Modeling apparent Pb loss in zircon U–Pb geochronology." Geochronology 6, no. 1 (January 19, 2024): 37–51. http://dx.doi.org/10.5194/gchron-6-37-2024.

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Abstract. The loss of radiogenic Pb from zircon is known to be a major factor that can cause inaccuracy in the U–Pb geochronological system; hence, there is a need to better characterize the distribution of Pb loss in natural samples. Treatment of zircon by chemical abrasion (CA) has become standard practice in isotope dilution–thermal ionization mass spectrometry (ID-TIMS), but CA is much less commonly employed prior to in situ analysis via laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) or secondary ionization mass spectrometry (SIMS). Differentiating the effects of low levels of Pb loss in Phanerozoic zircon with relatively low-precision in situ U–Pb dates, where the degree of Pb loss is insufficient to cause discernible discordance, is challenging. We show that U–Pb isotopic ratios that have been perturbed by Pb loss may be modeled by convolving a Gaussian distribution that represents random variations from the true isotopic value stemming from analytical uncertainty with a distribution that characterizes Pb loss. We apply this mathematical framework to model the distribution of apparent Pb loss in 10 igneous samples that have both non-CA LA-ICP-MS or SIMS U–Pb dates and an estimate of the crystallization age, either through CA U–Pb or 40Ar/39Ar geochronology. All but one sample showed negative age offsets that were unlikely to have been drawn from an unperturbed U–Pb date distribution. Modeling apparent Pb loss using the logit–normal distribution produced good fits with all 10 samples and showed two contrasting patterns in apparent Pb loss; samples where most zircon U–Pb dates undergo a bulk shift and samples where most zircon U–Pb dates exhibited a low age offset but fewer dates had more significant offset. Our modeling framework allows comparison of relative degrees of apparent Pb loss between samples of different age, with the first and second Wasserstein distances providing useful estimates of the total magnitude of apparent Pb loss. Given that the large majority of in situ U–Pb dates are acquired without the CA treatment, this study highlights a pressing need for improved characterization of apparent Pb-loss distributions in natural samples to aid in interpreting non-CA in situ U–Pb data and to guide future data collection strategies.
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Amelin, Yuri. "U–Pb ages of angrites." Geochimica et Cosmochimica Acta 72, no. 1 (January 2008): 221–32. http://dx.doi.org/10.1016/j.gca.2007.09.034.

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Ito, Hisatoshi. "Simultaneous U–Pb and U–Th Dating Using LA-ICP-MS for Young (<0.4 Ma) Minerals: A Reappraisal of the Double Dating Approach." Minerals 14, no. 4 (April 22, 2024): 436. http://dx.doi.org/10.3390/min14040436.

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Simultaneous U–Pb and U–Th dating using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was performed on the ca. 0.1 Ma Toya tephra and the ca. 0.08 Ma SS14-28 U–Th zircon reference material. In U–Pb dating, both Th/U and Pa/U partitioning between magma and minerals were considered. In U–Th dating, both abundance sensitivity and molecular interferences on 230Th were reevaluated. As a result, the Toya tephra yielded an accurate weighted mean U–Pb age of 0.103 ± 0.029 Ma (2σ) using zircon and monazite. Conversely, the SS14-28 zircon yielded an inaccurate U–Pb age (0.25 ± 0.10 Ma), which was attributed to low 206Pb signal intensity. Both the Toya tephra zircon and the SS14-28 zircon yielded accurate U–Th model ages of 0.108 ± 0.014 Ma and 0.078 ± 0.007 Ma, respectively. The agreement of U–Pb and U–Th ages for Toya indicates that simultaneous U–Pb and U–Th dating is possible and viable. The inappropriate age of SS14-28 U–Pb age and appropriate U–Th model age also indicates it is preferable to apply both U–Pb and U–Th dating simultaneously for young (<0.4 Ma) zircons to check internal consistency. The proposed double dating approach may be especially useful for small grains when it otherwise would be impossible to obtain multiple ages from a single grain. By adopting simultaneous U–Pb and U–Th dating using LA-ICP-MS, zircon crystallization ages as old as 4.5 Ga to as young as 0.1 Ma (or even younger) can be obtained in a quick and cost-effective manner with a reasonable (~5% at 1σ) uncertainty.
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Vermeesch, Pieter. "Unifying the U–Pb and Th–Pb methods: joint isochron regression and common Pb correction." Geochronology 2, no. 1 (May 11, 2020): 119–31. http://dx.doi.org/10.5194/gchron-2-119-2020.

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Abstract. The actinide elements U and Th undergo radioactive decay to three isotopes of Pb, forming the basis of three coupled geochronometers. The 206Pb ∕238U and 207Pb ∕235U decay systems are routinely combined to improve accuracy. Joint consideration with the 208Pb ∕232Th decay system is less common. This paper aims to change this. Co-measured 208Pb ∕232Th is particularly useful for discordant samples containing variable amounts of non-radiogenic (“common”) Pb. The paper presents a maximum likelihood algorithm for joint isochron regression of the 206Pb ∕238Pb, 207Pb ∕235Pb and 208Pb ∕232Th chronometers. Given a set of cogenetic samples, this total-Pb/U-Th algorithm estimates the common Pb composition and concordia intercept age. U–Th–Pb data can be visualised on a conventional Wetherill or Tera–Wasserburg concordia diagram, or on a 208Pb ∕232Th vs. 206Pb ∕238U plot. Alternatively, the results of the new discordia regression algorithm can also be visualised as a 208Pbc ∕206Pb vs. 238U ∕206Pb or 208Pbc ∕207Pb vs. 235U ∕206Pb isochron, where 208Pbc represents the common 208Pb component. In its most general form, the total-Pb/U-Th algorithm accounts for the uncertainties of all isotopic ratios involved, including the 232Th ∕238U ratio, as well as the systematic uncertainties associated with the decay constants and the 238U ∕235U ratio. However, numerical stability is greatly improved when the dependency on the 232Th ∕238U-ratio uncertainty is dropped. For detrital minerals, it is generally not safe to assume a shared common Pb composition and concordia intercept age. In this case, the total-Pb/U-Th regression method must be modified by tying it to a terrestrial Pb evolution model. Thus, also detrital common Pb correction can be formulated in a maximum likelihood sense. The new method was applied to three published datasets, including low Th∕U carbonates, high Th∕U allanites and overdispersed monazites. The carbonate example illustrates how the total-Pb/U-Th method achieves a more precise common Pb correction than a conventional 207Pb-based approach does. The allanite sample shows the significant gain in both precision and accuracy that is made when the Th–Pb decay system is jointly considered with the U–Pb system. Finally, the monazite example is used to illustrate how the total-Pb/U-Th regression algorithm can be modified to include an overdispersion parameter. All the parameters in the discordia regression method (including the age and the overdispersion parameter) are strictly positive quantities that exhibit skewed error distributions near zero. This skewness can be accounted for using the profile log-likelihood method or by recasting the regression algorithm in terms of logarithmic quantities. Both approaches yield realistic asymmetric confidence intervals for the model parameters. The new algorithm is flexible enough that it can accommodate disequilibrium corrections and intersample error correlations when these are provided by the user. All the methods presented in this paper have been added to the IsoplotR software package. This will hopefully encourage geochronologists to take full advantage of the entire U–Th–Pb decay system.
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Bonamici, Chloë E., and Tyler B. Blum. "Reconsidering initial Pb in titanite in the context of in situ dating." American Mineralogist 105, no. 11 (November 1, 2020): 1672–85. http://dx.doi.org/10.2138/am-2020-7274.

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Abstract In situ U-Pb dating of titanite, which can preserve trace-element records of various petrologic processes but also incorporates significant initial Pb, has proliferated in recent years. The widespread use of titanite data to construct tectonic P-T-t paths warrants careful assessment of the available dating techniques, as well as attention to the assumptions that underpin the U-Pb data analysis. This contribution provides the first direct comparison of the two major analytical methods [SHRIMP (SIMS) and LA-ICP-MS] for in situ U-Pb titanite dating. A set of well-characterized titanite grains from Harrisville, New York, in the Adirondack Mountains were analyzed for U-Th-Pb isotopes along the same cross-grain traverses by Sensitive High Resolution Ion Microprobe (SHRIMP) and LA-ICP-MS. Both LA-ICP-MS and SHRIMP data sets define approximately linear arrays on the Tera-Wasserburg Concordia (semi-total Pb/U) diagram and would commonly be interpreted as representing a single date population with minor scatter. However, previous studies have suggested that Adirondack titanite actually records two regionally well-defined thermal events, ~50–100 m.y. apart. When titanite data arrays are treated in detail, attempts to determine concordia-intercept ages by robust three-dimensional linear regression produce large uncertainties and/or poor fit statistics that suggest that the data are not, in fact, isochronous. Grain-by-grain analysis of U-Pb titanite data shows that different subsets of titanite (determined by additional geochemical and microstructural data) show different patterns of U-Pb data. By comparing predictions for Pb-ingrowth evolution paths in Tera-Wasserburg diagrams with observed data, it is possible to recognize both a change in initial Pb composition and Pb loss in the Adirondack titanite U-Pb data set. This study provides an example of how greater geochronologic detail can be extracted from large in situ U-Pb titanite data sets. Even when precise dates are not recovered, geological processes and events that cause data scatter can be recognized through analysis of U-Pb data patterns using the Tera-Wasserburg diagram.
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Frebel, Anna, and Karl-Ludwig Kratz. "Stellar age dating with thorium, uranium and lead." Proceedings of the International Astronomical Union 4, S258 (October 2008): 449–56. http://dx.doi.org/10.1017/s1743921309032104.

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AbstractWe present HE 1523-0901, a metal-poor star in which the radioactive elements Th and U could be detected. Only three stars have measured U abundances, of which HE 1523-0901 has the most confidently determined value. From comparing the stable Eu, Os, and Ir abundances with measurements of Th and U, stellar ages can be derived. Based on seven such chronometer abundance ratios, the age of HE 1523-0901 was found to be ~13 Gyr. Only an upper limit for Pb could be measured so far. Knowing all three abundances of Th, U, and Pb would provide a self-consistent test for r-process calculations. Pb is the beta- plus alpha-decay end-product of all decay chains in the mass region between Pb and the onset of dominant spontaneous fission above Th and U. Hence, in addition to Th/U also Th, U/Pb should be used to obtain a consistent picture for actinide chronometry. From recent r-process calculations within the classical “waiting-point” model, for a 13 Gyr old star we predict the respective abundance ratios of logϵ(Th/U) = 0.84, logϵ(Th/Pb) = −1.32 and logϵ(U/Pb) = −2.16. We compare these values with the measured abundance ratios in HE 1523-0901 of logϵ(Th/U) = 0.86, logϵ(Th/Pb) > −1.0 and logϵ(U/Pb) > −1.9. With this good level of agreement, HE 1523-0901 is already a vital probe for observational “near-field” cosmology by providing an independent lower limit for the age of the Universe.
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Abdullin, Fanis, Luigi A. Solari, Jesús Solé, and Carlos Ortega-Obregón. "Technical note: LA–ICP-MS U–Pb dating of unetched and etched apatites." Geochronology 3, no. 1 (January 20, 2021): 59–65. http://dx.doi.org/10.5194/gchron-3-59-2021.

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Abstract. The same unetched and chemically etched apatite crystals from five rock samples were dated by the U–Pb method via laser ablation inductively coupled plasma mass spectrometry (LA–ICP-MS). The objective of this study is to test whether chemical etching required for apatite fission track analysis impacts the precision and accuracy of apatite U–Pb geochronology. The results of this experiment suggest that etching has insignificant effects on the accuracy of apatite U–Pb ages obtained by LA–ICP-MS. Therefore, LA–ICP-MS is reliable for U–Pb analysis as part of apatite fission track and U–Pb double dating.
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Dissertations / Theses on the topic "U-Pb"

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Sparrenberger, Irena. "A cassiterita da subprovíncia do Rio Paranã (GO): datações U-Pb e Pb-Pb e caracterização mineral." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/44/44134/tde-29092015-103828/.

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Esta dissertação teve como objetivo a implantação do método de datação U-Pb em cassiterita no Centro de Pesquisas Geocronológicas da Universidade de São Paulo. Para tanto, utilizaram-se amostras da mineralização estanífera da Subprovincia do Rio Paranã, extremo nordeste do Estado de Goiás. A área compreende unidades de idade mínima transamazônica, representadas pelo Complexo Granito-Gnáissico e pela Formação Ticunzal, superpostas por metassedimentos predominantemente psamíticos do Grupo Araí, com idade aproximada de 1.770 Ma, e intrudidos por granitóides estaníferos paleo a mesoproterozóicos. Pegmatitos alojados nas duas primeiras unidades correspondem a outras manifestações da mineralização de estanho na subprovíncia. Datações pelo método K-Ar em muscovita situaram a idade da mineralização nos pegmatitos entre cerca de 2.000 Ma e 2.130 Ma. As análises por U-Pb na cassiterita confirmaram estes valores na maior parte dos casos. Quanto aos granitóides, uma idade U-Pb em cassiterita de 1.535\'+OU-\'57 Ma foi obtida. A metodologia U-Pb em cassiterita mostrou-se útil, desde que tomadas precauções como a análise de várias amostras distintas e a caracterização mineral prévia da fase, a fim de selecionar amostras isentas de inclusões de minerais portadores de Pb. Datações pelo método Pb-Pb resultaram incorretas na maior parte das vezes em função de excesso de Pb comum derivado de inclusões, especialmente de feldspato. A composição isotópica de Pb mais radiogênica foi verificada em cassiterita de rocha granitóide, analogamente ao reportado em Gulson & Jones (1992), sugerindo que o método pode ter melhor resposta se aplicado em mineralizações neste tipo de rocha. Caracterizou-se a ocorrência de pelo menos duas fácies distintas mineralizadas nos pegmatitos, com base na natureza de suas inclusões.
The purpose of this work was to set up the cassiterite U-Pb method of dating at Centro de Pesquisas Geocronologicas of Universidade de São Paulo. Samples of tin mineralization from the subprovíncia do Rio Paranã, Goiás State, were used to perform the experience. The area includes units of transamazonian minimum ages, represented by complexo Granito-Gnáissico and formação Ticunzal , overlayed by metamorphosed sandstones mainly, with ages close to 1.770 Ma, and intruded by paleo to mesoproterozoic tin granites. Pegmatites that cut the first and second units correspond to another manifestation of tin mineralization in the area. Muscovite K-Ar ages situated the pegmatites mineralization between 2,000 Ma and 2,130 Ma. The cassiterite U-Pb analyses confirmed these values in most cases. In relation to the granitoids, one single U-Pb age in cassiterite of 1,535 \'+ ou -\' 57 Ma was obtained. The cassiterite U-Pb methodology proved useful since caution is taken, as dating of many distinct samples and mineralogical characterization of the phase prior to dating in order to select samples without inclusions of pb-bearing minerals. The most radiogenic isotopic composition of Pb was verified in cassiterite from a granitoid rock, in analogy to what was reported by Gulson & Jones (1992). This suggests that the method can give better results if applied to mineralization in such rocks. The occurrence of at least two mineralized distinct facies was characterized in the pegmatites, based on its inclusions peculiarities.
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Freitas, Vivian Azor de. "A geração de magmas ácidos na Província Magmática Paraná, região de Piraju-Ourinhos (SP): uma contribuição da geoquímica isotópica e de elementos traço em rochas e minerais." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-08062009-153408/.

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Os dacitos da região de Piraju-Ourinhos (SP), que se estendem por cerca de 60 km acompanhando o curso do rio Paranapanema, são as exposições mais setentrionais do magmatismo ácido da Província Magmática Paraná. Estratigraficamente, jazem sobre os arenitos eólicos da Formação Botucatu e são sobrepostos por derrames de basaltos de alto Ti tipo Pitanga. Diques e soleiras de basaltos presentes na região têm afinidades químicas variadas, podendo ser comparados aos tipos Paranapanema, Urubici e Pitanga. Os traquidacitos, classificação química dessas rochas, apresentam textura porfirítica com 5 a 15% de fenocristais de plagioclásio, clinopiroxênio, minerais opacos e apatita. A matriz afanítica a fanerítica fina é composta por vidro, plagioclásio, clinopiroxênio, quartzo e feldspato alcalino. Vidro pode constituir de 10 a 90% da matriz e em muitos casos está devitrificado, mostrando texturas reliquiares de quenching. Vesículas e amígdalas são abundantes em certas variedades de traquidacitos, podendo chegar a 40% da rocha. Foi obtida neste trabalho a idade U-Pb do magmatismo ácido por TIMS em concentrados de badeleíta e zircão. O valor, 134,4 ± 0,9 (2\'sigma\'), é mais exato e preciso que as idades obtidas previamente nos traquidacitos da região, 133 -134 ± 6 Ma (K-Ar, 1\'sigma\') e 128,7 ± 1 Ma (\'ANTPOT.40 Ar\'/\'ANTPOT.39 Ar\', 1\'sigma\'), e encontra-se no curto intervalo de tempo atualmente admitido para o clímax do vulcanismo na Província. As razões iniciais \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\' dos traquidacitos (0,7078 a 0,7080) são pouco mais radiogênicas que as dos basaltos (0,7056 a 0,7068), enquanto os valores de \'épsilon\'\'Nd IND.134\' são mais negativos (~ -5 versus -4). Tais diferenças sugerem que, embora os basaltos devam ter vínculo genético com o magmatismo ácido da região, deve existir alguma contribuição crustal na gênese das rochas vulcânicas ácidas. As razões iniciais \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\' obtidas por LA-ICPMS mostram valores idênticos na matriz e em fenocristais de plagioclásio e apatita (~0,7077), consistentes com cristalização em equilíbrio. Com exceção de um cristal de plagioclásio que é fortemente mais radiogênico (~0,7083) e outro menos radiogênico (~0,7074), podendo corresponder a duas diferentes suítes de antecristais. A maioria dos fenocristais de clinopiroxênio tem razões iniciais \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\' diferentes da matriz [em geral menores, entre 0,7045 e 0,7071; somente um cristal é mais radiogênico, 0,7084]. Junto com dois fenocristais de plagioclásio (com \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\' inicial de 0.7083 e 0.7074), eles não se formaram em equilíbrio com a matriz, e são prováveis antecristais. Modelamentos geoquímicos utilizando elementos maiores e elementos traço compatíveis e incompatíveis mostram que é possível obter o magma ácido após a cristalização fracionada de 60 a 80% de basalto tipo Pitanga. O principal obstáculo para esse modelo seria o hiato composicional de sílica entre os magmas ácidos e básicos; no entanto, esse hiato pode resultar de limitações físicas impostas à separação cristal-líquido em composições intermediárias e à extração por filter pressing de líquidos residuais mais evoluídos. As pequenas diferenças nas razões isotópicas de Sr e Nd entre as rochas ácidas e básicas podem ser explicadas por um modelo de AFC com 60% de cristalização de um magma basáltico e assimilação de 10-30% de líquido granítico derivado do embasamento pré-Cambriano. Por outro lado, o modelo de refusão de underplates basálticos prevê a geração de magmas ácidos com teores de elementos compatíveis (Ni, Cr e V) mais elevados, e portanto demandariam fracionamento para alcançar as composições observadas nos traquidacitos.
Dacitic rocks from Piraju-Ourinhos, State of São Paulo, outcrop for ca. 60 km along the Paranapanema River valley, and constitute the northernmost expositions of the Parana Magmatic Province acid magmatism. They rest directly over the Botucatu Formation eolic sandstones and are recovered by Pitanga-type high Ti basalt flows. Basalt dykes and sills that occur in the region show different chemical relationship and can be compared to the Paranapanema, Urubici and Pitanga basalt types. Chemically classified as trachydacites, these rocks are porphyritic with 5 to 15% plagioclase, clinopyroxene, opaque minerals and apatite phenocrysts. Aphanitic to phaneritic groundmass is composed of glass, plagioclase, clinopyroxene, quartz and alkali feldspar. Glass can make up 10 to 90% of the original groundmass and is usually devitrified, being recognized by relict quenching textures. Vesicles and amygdalas are abundants in such trachydacites varieties and can achieve to 40% of rock. In this work, the age of the acid magmatism was obtained by U-Pb TIMS in baddeleyite and zircon concentrates. The value [134.4 0,9 (2\'sigma\')], is more accurate and precise compared with ages previously obtained in the trachydacites from region [133 -134 ± 6 Ma (K-Ar); 128.7 ± 1 Ma (\'ANTPOT.40 Ar\'/\'39 ANTPOT.Ar\')], and within the short age interval currently admitted for the Paraná volcanism climax. Initial \'ANTPOT.87 Sr\'/\' ANTPOT.86 Sr\' ratios of the trachydacites (0.7078 to 0.7080) are slightly more radiogenic than those of associated basalts (0.7056 to 0.7068), whereas \'épsilon\'\'Nd IND.134\' are more negative (~ -5 versus -4). These differences suggest that, although the basalts must have a genetic link with the acid magmatism of region, some crustal contribution may exist in the acid magmas. Initial \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\' obtained by LA-ICPMS show identical values for the groundmass and plagioclase and apatite phenocrysts (~0.7077), consistent with equilibrium crystallization. Most of the clinopyroxene phenocrysts have initial \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\' different from the groundmass (usually smaller; 0.7045-0.7071; only one crystal is more radiogenic, 0.7084). Together with two the plagioclase phenocrysts (with initial \'ANTPOT.87 Sr\'/\'ANTPOT.86 Sr\'= 0.7083 and 0.7074), they did not crystallize in equilibrium to the groundmass, and are likely antecrysts. Geochemical modelling using major elements and both compatible and incompatible trace-elements show that it is possible to obtain the acid magmas after 60 to 80% fractional crystalization of a Pitanga-type basalt. The main obstacle for such model would be the wide compositional silic gap between acid and basic magmas.; however, this gap could result from physical limitations to crystal-liquid separation at intermediate compositions and to the extraction by filter pressing of more evolved residual liquids. The small differences in Sr-Nd isotopic signature between acid and basic rocks can be explained by an AFC model, with 60% of basaltic magma crystalization plus ~10-30% assimilation of a granitic liquid derived from the pre- Cambrian basament. On the other hand, a model of remelting of basalt underplates generates acid magmas with higher contents of compatible elements contents (Ni, Cr, V) and therefore would demand some fractionation to achieve the observed trachydacite compositions.
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Godeau, Nicolas. "Développement et application de la méthode Uranium-Plomb à la datation des carbonates diagénétiques dans les réservoirs pétroliers, et apport à la reconstruction temporelle de l'évolution des propriétés réservoir." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0149.

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L'apport de contraintes chronologiques absolues sur les différents évènements et processus qui ont modelé la Terre constitue un des défis majeurs dans de nombreux domaines des sciences de la terre et de l'environnement. C'est en particulier le cas pour les bassins sédimentaires qui jouent un rôle économique majeur en étant sources d'importantes ressources naturelles, en particulier en hydrocarbures. L'objectif de cette thèse est de développer la datation absolue des minéraux secondaires carbonatés par la méthode U-Pb. Ces minéraux, quasi ubiquistes dans les réservoirs, témoignent des processus diagénétiques, tectoniques et des circulations fluides qui ont affecté ces systèmes. Au cours de cette thèse, plusieurs développements méthodologiques ont été mis en œuvre avec pour objectifs de repousser les limites de la méthode U-Pb. Des techniques d’analyses innovantes, comme le couplage ablation laser/SF-ICP-MS ou la sonde ionique, ont été testées et ont permis d’accroître de plusieurs ordres de grandeur la résolution spatiale des analyses U-Pb. Ces méthodes, couplées à la méthode plus classique de dilution isotopique ont été appliquées avec succès dans différents contextes d’exploration pétrolière permettant notamment d’apporter des contraintes temporelles sur des éléments clés du système pétrolier, comme le timing de la création/préservation du réservoir ou encore de la migration des hydrocarbures. Les différents résultats obtenus ont permis de dresser une synthèse des contextes les plus favorables à l’application de la méthode U-Pb, et de donner ainsi une vision d’ensemble du potentiel de la datation U-Pb sur carbonates secondaires appliquée aux réservoirs pétroliers
Absolute chronological constraints on the different events and processes that have shaped the Earth constitute a major challenge in numerous realms in Earth and Environmental sciences. In particular this is the case for sedimentary basins that play a major economic role as being source of important hydrocarbon resources. The objective of this thesis is to develop absolute uranium-lead dating methodology on secondary carbonate minerals. This ubiquitous mineral phase in petroleum reservoirs testifies their complex geodynamic and diagenetic histories. In this study, several developments were implemented in order to circumvent the limits of U-Pb methodology. Innovative analysis techniques such as laser ablation coupled with SF-ICP-MS or ion probe were tested to increase the spatial resolution of the U-Pb analysis by several orders of magnitude. These methodologies coupled to the more traditional isotope dilution was successfully applied in different oil exploration context allowing to bring absolute constraints on key diagenetic events such as creation/preservation of reservoir properties or hydrocarbon migration. The results obtained during this study allowed to draw a synthetic model of the most favorable contexts for U-Pb method and gives an overview of the U-Pb dating potential to secondary carbonates applied to petroleum reservoirs
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Santos, Zalduegui Jose Francisco. "Evolution du complexe mafique-ultramafique du cabo ortegal (espagne) : etude isotopique des systemes u-pb, rb-sr et pb-pb." Paris 7, 1994. http://www.theses.fr/1994PA077329.

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Le complexe catazonal de cabo ortegal fait partie de la chaine varisque en europe occidentale. Des hypotheses diverses sur l'origine et evolution de ce complexe et complexes associes dans le no du massif iberique (ordenes, braganca et morais) ont ete proposees. Cependant, il restait encore de nombreux problemes a resoudre. Une etude gechronologique et geochimique a ete effectuee sur plusieurs echantillons provenant de ces complexes. Dans le cas du complexe de cabo ortegal, l'etude d'un meta-plagiogranite confirme l'existence d'un episode magmatique a ca. 470 ma (u-pb sur zircon) dans l'unite ophiolitique. L'existence d'un composant herite dans les zircons et la composition isotopique du sr initial suggerent une participation de materiaux crustaux dans la formation d'une croute oceanique. Cet episode magmatique est comparable a celui deja reconnu dans les granulites et eclogites du meme complexe. La datation u-pb et rb-sr sur quatre echantillons appartenant a l'unite granulitique/eclogitique indique l'existence d'un processus metamorphique majeur a ca. 390-400 ma. Il serait accompagne d'une fusion partielle du manteau et la croute. Cet age a ete interprete en relation avec un evenement de subduction suivi d'une obduction rapide des complexes. Dans le meme complexe, on a effectue une etude u-pb-pb et rb-sr des pyroxenites et peridotites exposees aux massifs d'herbeira et uzal. Les resultats indiquent que ces roches derivent d'une source avec de rapports u/pb et rb/sr plus elevees que ceux des sources morb a present. Finalement, dans l'unite de malpica tuy, situee structurellement au dessous du complexe du cabo ortegal, on a etabli l'age du magmatisme calc-alcalin a 480 ma (u-pb sur zircon) avec la participation d'un ancien composant de croute continentale (> 1800 ma). La datation rb-sr des roches metamorphiques en facies eclogite de cette unite indique un age de ca. 360 ma pour le refroidissement subsequent au metamorphisme de haute pression
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5

Gengo, Rafaela Machado. "Petrologia de ortognaisses e granitóides do Domínio Socorro, Nappe Socorro-Guaxupé, Seção Extrema-Camanducaia." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-03122014-095629/.

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A Nappe Socorro - Guaxupé representa um antigo arco magmático formado durante a fase colisional do Orógeno Brasília Meridional, um dos importantes eventos orogênicos do Neoproterozóico responsáveis pela aglutinação da porção ocidental do paleocontinente Gondwana. Na porção sudeste do Domínio Socorro, muitas das zonas de cisalhamento de direção NE-SW condicionaram a colocação de inúmeros corpos e batólitos de granitóides cálcio - alcalinos potássicos gerados a partir da fusão crustal sin - orogênica da nappe, durante o pico metamórfico em um ambiente de altas temperaturas a baixas profundidades. Na região são encontrados ortognaisses e migmatitos não correlacionáveis aos migmatitos estromáticos pelíticos a semi-pelíticos dominantes da Unidade Metatexítica da Nappe. Até o momento essas rochas eram consideradas parte do Complexo Amparo, como embasamento do Complexo Granitóide Socorro. Este trabalho apresenta dados geoquímicos, isotópicos e geocronológicos inéditos para rochas da região entre Extrema e Camanducaia, sul de Minas Gerais, e que permitiram caracterizar o magmatismo que deu origem a esses ortognaisses e sua evolução crustal, bem como determinar sua idade dentro do contexto Neoproterozóico da Nappe Socorro - Guaxupé. Idades U-Pb obtidas em cristais de zircão do paleossoma diorítico nos ortognaisses metatexíticos forneceram idade de 662,1 ± 5,1 Ma. Idades pontuais mais antigas entre 770 e 834 Ma foram encontradas apenas em núcleos herdados. Em ortognaisses dioríticos a granodioríticos, onde não foram iniciados processos de fusão parcial, idades U-Pb em zircões de um ortognaisse de composição diorítica forneceram idades entre 660 e 630 Ma, implicando em um magmatismo Neoproterozóico atuante ao longo do período pré a sin-colisional da Nappe Socorro Guaxupé, em um ambiente de arco magmático estacionário por pelo menos 30 Ma, situação análoga a que ocorre atualmente no arco magmático do Japão. O magmatismo que deu origem aos ortognaisses dioríticos a granodioríticos possui afinidades com a série cálcio-alcalina de alto K e características geoquímicas e isotópicas semelhantes à granitos do tipo I. Razões \'ANTPOT.87 Sr\'/ \'ANTPOT.86 \'Sr IND.i\' e valores de \'épsilon\'Nd negativos evidenciam fontes crustais empobrecidas em elementos incompatíveis. Na fase tardi a pós-colisional da Nappe, no período de 609 a 598 Ma, pulsos finais do magmatismo diorítico deram lugar ao magmatismo que resultou na colocação de diversos corpos de rochas monzodioríticas e monzoníticas, em parte com feições de interação e mistura de magmas e que possuem assinatura geoquímica do tipo A, semelhante às rochas do Plúton Piracaia, pós - colisional.
The Socorro - Guaxupé Nappe represents an ancient magmactic arc formed during the collisional phase of the Southern Brasília Orogen), one of the important Neoproterozoic orogenic events, responsible for the agglutination of the western portion of Gondwana paleo continent. In the southeastern portion of the Socorro Domain, many NE-SW shear zones controlled the intrusion of many bodies and batholiths of potássic calc-alkaline granitoids, generated by sin-orogenic crustal melting of the nappe in a shallow-depth, high-temperature environment, during the metamorphic peak. The orthogneisses and migmatites that crop out in the area are not related to the stromatic pelitic to semi-pelitic migmatites that are predominant in the nappe\'s Metatexitic Unit. So far, these rocks were considerated to be part of the Amparo Complex, which is the basement of the Socorro Granitoid Complex. This work present new geochemical, isotopic and geochronological data for rocks from the region between Extrema and Camanducaia, southern Minas Gerais, which allow the characterization of the magmatism that originated those orthogneisses and its crustal evolution, and also the determination of its age in the Neoproterozoic context of the Socorro-Guaxupé Nappe. U-Pb zircon ages obtained from dioritic paleossome of the metatexitic orthogneisses provided ages of 662,1 ± 5,1 My. Sporadic older ages from 770 to 834 My were found only in inherited cores. On dioritic to granodioritic orthogneiss where partial melting processes were not started, zircon crystals from an orthogneiss of dioritic composition provided 660 to 630 My U-Pb ages, implying an active Neoproterozoic magmatism during the pre- to sin-collisional period of the Socorro-Guaxupé Nappe, in a static magmatic arc environment for ate least 30 My, which is a condition similar to the present-day Japan\'s magmatic arc occurrence. The magmatism which originated the dioritic to granodioritic orthogneisses has affinities with the high-K calc-alkaline series and geochemical and isotopic characteristics similar to I-Type granites. \'ANTPOT.87 Sr\'/ \'ANTPOT.86 \'Sr IND.i\' rates and negative \'épsilon\'Nd values point to a crustal source depleted in incompatible elements. At the tardi- to post- collisional phase of the nappe, during the period from 609 to 598 My, the last pulses of dioritic magmatism gave place to a monzodioritic and monzonitic magmatism which resulted in the intrusion of many rock bodies with an A-Type geochemical signature similar to the post-collisional Piracaia Pluton, part of which exhibit magma interaction and magma mixing features.
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Triantafyllou, Antoine. "Évolution géodynamique d’un arc insulaire néoprotérozoïque de l’Anti -Atlas marocain : caractérisation des processus de croissance intra-océanique et d’accrétion." Thesis, Nantes, 2016. http://www.theses.fr/2016NANT4031/document.

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Les reliques néoprotérozoïques d’un système d’arc intra-océanique affleurent dans l’Anti-Atlas au Sud du Maroc, dans les fenêtres du Sirwa et de Bou Azzer. Les deux zones présentent des ensembles fortement tectonisés représentés au Nord par une séquence ophiolitique d’arrière-arc charriée sur des complexes d’arc accrétés au Sud. Ces complexes d’arc (complexes de Tachakoucht, Tazigzaout et Bougmane) sont composés de gneiss granodioritiques et d’amphibolites dont les protolithes, datés entre 750 et 730 Ma, montrent des signatures typiques d’arcs océaniques. Ces derniers ont été enfouis, déformés et métamorphisés sous des conditions de MP-MT (700°C – 8 kbar) à Tachakoucht et de HP-MT à Bougmane (750°C – 10 kbar) avant que des magmas basiques hydratés (hornblendites, gabbros à hornblende) d’affinités d’arcs océaniques ne les intrudent successivement à ~700 et ~650 Ma. Ces épisodes magmatiques ont bouleversé le régime thermique de l’arc entrainant la granulitisation et la fusion partielle des roches encaissantes à plusieurs niveaux crustaux de l’arc et générant des magmas granodioritiques à granitiques recoupant la section crustale du paléo-arc et de l’ophiolite sus-jacente. Cette étude de terrain, pétrologique, géochimique et géochronologique a mis en évidence trois épisodes de magmatisme océanique d’arc sur une période de plus de 120 Ma (de 760 à 640 Ma). La croissance de ce paleo-arc fut contrôlée par les phases successives d’alimentation magmatique mais aussi par des processus tectoniques d’épaississement en domaine intra-océanique et ce, avant l’obduction de l’arc sur le Craton Ouest africain autour de 630-600 Ma
Relics of an intra-oceanic arc system are exposed in the Anti-Atlas in southern Morocco, in the Sirwa and Bou Azzer windows. Both of these areas form a highly tectonized patchwork made of a back-arc ophiolitic sequence to the north thrusted onto accreted arc complexes to the south. These arc complexes (Tachakoucht, Tazigzaout and Bougmane complexes) are made of granodioritic gneisses and amphibolites with typical oceanic arc signature and for which igneous ages range from 750 to 730 Ma. These magmas were buried, deformed and metamorphosed under MP-MT conditions in Tachakoucht (700°C - 8kbar) and HP-MT in Bougmane (750°C - 10 kbar) prior to several magmatic events dated at 700 and 650 Ma and the intrusion of hydrous basic magmas (hornblende gabbros, hornblendites) with oceanic arc signatures. This episodic magmatism strongly perturbed the thermal regime of the arc leading to the granulitization of the host rocks at different levels of the arc crust and to the genesis of intermediate to felsic magmas (granodioritic to granitic). These ones have been segregated through the crustal section intruding both stacked paleo-arc and ophiolitic remnants. This field, petrological, geochemical and geochronological study established that oceanic arc magmatism in the Anti-Atlas occurred in three flare-ups on a 120 Ma long time span (760 to 640 Ma). The growth of the arc was controlled and driven both by successive magmatic inputs and intra-oceanic tectonic thickening processes while final collision of the intraoceanic system with the West African Carton occurred later, around 630-600 Ma
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SANTOS, Lucilene dos. "Caracterização petrológica e geoquímica dos granitoides intrudidos ao longo da zona de cisalhamento Coxixola, Província Borborema, NE Brasil: plutons Serra Branca e Coxixola." Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/10434.

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CNPq
Os granitoides estudados (plutons Serra Branca - GPSB e Coxixola - GPC) intrudem ortognaisses e migmatitos paleoproterozóicos a arqueanos, e rochas supracrustais Neoproterozóicas. Os GPSB, sienogranitos leucocráticos, equigranulares, contendo localmente enclaves de granitos porfiríticos (GPC) e dioritos, compreendem intrusão alojada em terminações extensionais de zonas de cisalhamento NE-SW transcorrentes sinistrais, ramificações da zona de cisalhamento Coxixola (ZCC), destral com direção E-W. Os GPC compreendem quartzo sienitos, quartzo monzonitos e sieno a monzogranitos, porfiríticos, deformados no estado sólido, com anfibólio de composição ferro - edenita, edenita e Mg - hornblenda. Enxames de enclaves máficos, quartzo dioritos a quartzo monzonitos, ocorrem orientados na direção E - W. A fO2 varia de intermediária (GPSB) a elevada (GPC). Estimativas de temperaturas liquidus utilizando saturação em zircão, variam entre 836 °C - 893 °C (GPC) e 783 °C - 843 °C (GPSB). Os granitoides estudados mostram valores fortemente negativos de εNd(t) e idades modelo (TDM) paleoproterozóicas. U-Pb em zircão por SHRIMP definiu uma idade de 560 ± 5 Ma para os GPSB, e por LA-ICP-MS definem idades de 573 ± 3 Ma para um dique de leucogranito que corta os GPC e de 580 ± 7 Ma para os GPC. Os GPSB são ricos em SiO2 (> 70%), levemente peraluminosos, com padrões ETR fracionados, mostrando profundas anomalias negativa de Eu, e padrões Spidergram com depressões em Nb, Ta, Sr, P e Ti. São classificados como granitoides trans-alcalinos ferrosos, tipo-A pós-orogênico. Os GPC mostram teores intermediários de SiO2 de 55-67 %, são metaluminosos, magnesianos, tipo-I mostrando padrões de ETR fracionados e caracterizados pela ausência ou anomalias fracamente positivas de Eu, e padrões Spidergram com depressões em Th, Nb, Ta, Ti. Assinaturas isotópicas e geoquímicas sugerem que os granitoides estudados foram originados pela mistura de magmas gerados pela fusão de crosta paleoproterozóica ou arqueana e pequena fração de material Neoproterozóico em diferentes épocas da história evolutiva da ZCC.
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Pineda, Ramírez Camila Andrea. "Geocronología U/Pb en circones de la ignimbrita Pudahuel." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137862.

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Geóloga
La Ignimbrita Pudahuel corresponde a un depósito asociado al Complejo Volcánico Maipo perteneciente la Zona Volcánica Sur de la Cordillera de los Andes, en la zona central de Chile. Su génesis es asociada a la formación de la Caldera Diamante y se infiere que se trató de una gran erupción, cuyo volumen se estima en aproximadamente 450 km3. La edad de esta ignimbrita es un tema controversial debido a las diferencias encontradas en los trabajos geocronológicos realizados en ella que, mediante diferentes métodos de datación, entregan edades de 0,45 Ma, 2,3 Ma y 0,15 Ma aproximadamente. Se observan afloramientos tanto en Chile como en Argentina, sin embargo, el presente trabajo considera solo localidades en la zona chilena. Se realizaron mediciones químicas en fenocristales de plagioclasa encontrados en el depósito, a partir de las cuales se infiere que el magma en que se originaron estos cristales posee un carácter diferenciado y aparentemente no sufrió grandes variaciones composicionales en la cámara magmática. El grueso de este trabajo consistió en el estudio morfológico y geocronológico de aproximadamente 900 circones separados de la Ignimbrita Pudahuel. El estudio morfológico y textural de estos cristales se realizó mediante imágenes de cátodo- luminiscencia obtenidas con el equipo SEM, mientras que la determinación de isótopos de U/Pb para geocronología se realizó con el equipo LA-ICPMS-MC del Departamento de Geología de la Universidad de Chile. Los datos obtenidos indican una fuerte presencia de tres poblaciones de edades para estos cristales. La localización de las muestras que presentan estas poblaciones indica que aparentemente no existe un nexo entre ellas ya que su presencia no está restringida a alguna de las facies definidas para la Iginimbrita, a algún cauce particular por donde se pudo haber desplazado o a una cierta distancia de la fuente. Por lo anterior se piensa que la ausencia de estas poblaciones en algunas localidades puede deberse a errores estadísticos. Las dos poblaciones más antiguas que pueden ser identificadas (una de: 10,17 +0,08 -0,22; y otra de: 5,22 +0,06 -0,03) son asociadas a eventos diferentes del que originó a la Ignimbrita Pudahuel, probablemente de carácter local en la zona donde posteriormente se formó la Caldera Diamante. La otra población identificada posee edades menores a 1 Ma. La edad más probable para esta población es de 0,13 +0,03 -0,02 Ma, sin embargo, los datos que representan esta edad pertenecen principalmente a una sola muestra. Si no se considera esta muestra la edad más probable es de 0,39 +0,03 -0,06 Ma. Ambas edades son coherentes con trabajos de dataciones realizados anteriormente en la Ignimbrita, pero de todas formas corresponderían a una edad más joven que la considerada actualmente. Según lo anterior se propone que la edad de 0,13 Ma corresponde a la del evento eruptivo que originó a la Ignimbrita Pudahuel, mientras que la de 0,39 Ma correspondería a cristales que se encontraban en la cámara magmática previos a la erupción y que por lo tanto el tiempo de residencia del magma silíceo al que pertenecían sería de aproximadamente 300 ka. Si bien el método analítico utilizado no es el más adecuado para este tipo de muestras, las edades obtenidas se pueden corregir. Debido a la controversia existente en torno a la edad de la Ignimbrita Pudahuel es de vital importancia realizar dichas correcciones para validar estos datos e integrarlos al debate.
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9

Neace, Erika R. "Zircon LA-ICPMS Geochronology of the Cornubian Batholith, SW England." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448912006.

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Maurin, Jean-Christophe. "Analyse de zônes décrochantes dans le Fossé de la Benoue (Nigéria) et systématiques U-Pb et Pb-Pb appliquées aux minéralisations uranifères et Pb-Zn associées." Grenoble : ANRT, 1985. http://catalogue.bnf.fr/ark:/12148/cb37594951d.

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Books on the topic "U-Pb"

1

Petrovich, Shcherbak Nikolaĭ, ed. Mineralʹnye U-Pb vozrasty dokembrii͡a vostochnoĭ chasti Baltiĭskogo shchita. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1987.

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Guerrot, C. Archéen et protérozoïque dans la chaîne hercynienne ouest-européenne: Géochimie isotopique (Sr-Nd-Pb) et géochronologie U-Pb sur zircons. Rennes, France: Editions du C.A.E.S.S., Université de Rennes I, 1989.

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Teufel, Stephan. Vergelichende U-Pb- und Rb-Sr-Alterbestimmungen an Gesteinen des Ubergangsbereiches Saxthuringikum/Moldanubikum,NE-Bayern. Gottingen: Im Selbstverlag der Geologischen Inst.der Georg-August-Univ., 1988.

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Toth, Margo I. Constraints on the formation of the Bitterroot lobe of the Idaho Batholith, Idaho and Montana, from U-Pb zircon geochronology and feldspar Pb isotopic data. Washington, DC: U.S. G.P.O., 1992.

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E, Villeneuve M., ed. Tectonic subdivision and U-Pb geochronology of the crystalline basement of the Alberta Basin, western Canada. Ottawa, Canada: Geological Survey of Canada, 1993.

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A, Agar Robert, Saudi Arabia. Deputy Ministry for Mineral Resources, and Geological Survey (U.S.), eds. U-Pb isotopic evidence for accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1986.

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A, Agar Robert, Saudi Arabia. Deputy Ministry for Mineral Resources., and Geological Survey (U.S.), eds. U-Pb isotopic evidence for accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1986.

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A, Agar Robert, Saudi Arabia. Deputy Ministry for Mineral Resources., and Geological Survey (U.S.), eds. U-Pb isotopic evidence for accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1986.

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A, Agar Robert, Saudi Arabia. Deputy Ministry for Mineral Resources., and Geological Survey (U.S.), eds. U-Pb isotopic evidence for accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1986.

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A, Agar Robert, Saudi Arabia. Deputy Ministry for Mineral Resources., and Geological Survey (U.S.), eds. U-Pb isotopic evidence for accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1986.

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Book chapters on the topic "U-Pb"

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Amelin, Yuri. "Meteorites (U–Pb)." In Encyclopedia of Marine Geosciences, 559–62. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_111.

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Amelin, Yuri. "Meteorites (U–Pb)." In Encyclopedia of Scientific Dating Methods, 1–6. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_111-1.

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Getty, Stephen R., and Donald J. Depaolo. "U-Pb and Th-Pb Geochronology in Quaternary Rocks." In AGU Reference Shelf, 121–29. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/rf004p0121.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, and I. Savysyuk. "(Sr,Pb)(Y,U)(Ti,Fe)20O38." In Structure Types. Part 9: Space Groups (148) R-3 - (141) I41/amd, 82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02702-4_44.

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Chelle-Michou, Cyril, and Urs Schaltegger. "U–Pb Dating of Mineral Deposits: From Age Constraints to Ore-Forming Processes." In Isotopes in Economic Geology, Metallogenesis and Exploration, 37–87. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_3.

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AbstractThe timing and duration of ore-forming processes are amongst the key parameters required in the study of mineral systems. After more than a century of technical developments, innovations and investigation, the U–Pb system arguably is the most mature radioisotopic system in our possession to conduct absolute dating of a wide range of minerals across geological environments and metallogenic processes. Here, we review the basics of U–Pb geochronology, the key historic developments of the method, and the most commonly used analytical techniques (including data reduction, Pb-correction, uncertainty propagation and data presentation) and minerals while pointing out their respective advantages, weaknesses and potential pitfalls. We also highlight critical aspects that need to be considered when interpreting a date into the age of a geological process (including field and petrographic constraints, open-system behavior, handling and interpretation of uncertainties). While U–Pb geochronology is strongly biased toward zircon dating, we strive to highlight the great diversity of minerals amenable to U–Pb dating (more than 16 mineral species) in the context of mineral systems, and the variety of geological events they can potentially date (magmatism, hydrothermal activity, ore-formation, cooling, etc.). Finally, through two case studies we show (1) how multi-mineral geochronological studies have been used to bracket and decipher the age of multiple geological events associated with the world-class Witwatersrand gold province, and (2) how rather than the absolute age, the duration and rate of the mineralizing event at porphyry copper deposits opens new avenues to understand ore-forming processes and the main controls on the size of such deposits. The improving precision, accuracy and spatial resolution of analyses in tandem with high-quality field and petrographic observations, numerical modelling and geochemical data, will continue to challenge paradigms of ore-forming processes and contribute significant breakthroughs in ore deposit research and potentially to the development of new exploration tools.
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Su, Ben-Xun. "Zircon U–Pb Geochronlogy and Hf–O Isotopes." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 69–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_5.

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Suzuki, Kazuhiro, and Daniel J. Dunkley. "Uranium–Lead, Chemical Isochron U–Pb Method (CHIME)." In Encyclopedia of Scientific Dating Methods, 863–69. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_200.

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Suzuki, Kazuhiro, and Daniel J. Dunkley. "Uranium-Lead, Chemical Isochron U-Pb Method (CHIME)." In Encyclopedia of Scientific Dating Methods, 1–9. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_200-1.

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Harrison, T. Mark, Elizabeth J. Catlos, and Jean-Marc Montel. "14. U-Th-Pb Dating of Phosphate Minerals." In Phosphates, edited by Matthew J. Kohn, John Rakovan, and John M. Hughes, 523–58. Berlin, Boston: De Gruyter, 2002. http://dx.doi.org/10.1515/9781501509636-017.

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Tolosana-Delgado, R., K. G. van den Boogaart, E. Fišerová, K. Hron, and I. Dunkl. "Joint Compositional Calibration: An Example for U–Pb Geochronology." In Springer Proceedings in Mathematics & Statistics, 181–209. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44811-4_12.

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Conference papers on the topic "U-Pb"

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Smye, Andrew. "Applications and Limitations of U-Pb Thermochronology." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2417.

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Smye, Andrew J. "APPLICATIONS AND LIMITATIONS OF U-PB THERMOCHRONOLOGY." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-302498.

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Sundell, Kurt E., and Joel E. Saylor. "UNMIXING DETRITAL ZIRCON U-PB AGE DISTRIBUTIONS." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305507.

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Schaltegger, Urs, Nicolas Greber, Maria Ovtcharova, Sean Gaynor, Blair Schoene, Jörn-Frederik Wotzlaw, Joshua Davies, and Federico Farina. "U-Pb geochronology at 100ppm age uncertainty." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5741.

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Neymark, Leonid, Richard Moscati, Anatoly Larin, and John Slack. "How Robust is the Cassiterite U-Pb Geochronometer?" In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1917.

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Glorie, Stijn, Alexander Simpson, Jack Gillespie, Martin Hand, Sarah Gilbert, and Chris Kirkland. "Detrital apatite Lu-Hf and U-Pb geochronology." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.4941.

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Stephens, Travis Scott, Chad J. Pritchard, and Paul O’Sullivan. "U-PB GEOCHRONOLOGY OF SILVER HILL, SPOKANE COUNTY, WASHINGTON." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-298572.

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Hofmann, Albrecht. "Pb isotopic evidence for U exchange with the core?" In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5468.

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Beranoaguirre, Aratz, Leo Millonig, Richard Albert, Horst Marschall, and Axel Gerdes. "U-Pb dating of metamorphic Ilmenite by LA-ICPMS." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.18381.

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Millonig, Leo, Aratz Beranoaguirre, Richard Albert, Horst Marschall, and Axel Gerdes. "Garnet reference material for in situ U-Pb dating." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.20819.

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Reports on the topic "U-Pb"

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Parrish, R. R., and J. W. H. Monger. New U - Pb Dates From southwestern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132915.

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Parrish, R. R. Miscellaneous U - Pb Zircon Dates From Southeast British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132919.

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Bickerton, L., D. J. Kontak, I. M. Samson, J. B. Murphy, and D A Kellett. U-Pb geochronology of the South Mountain Batholith, Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2018. http://dx.doi.org/10.4095/306421.

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Bevier, M. L., and J. B. Whalen. U-Pb geochronology of Silurian granites, Miramichi Terrane, New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129075.

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Monger, J. W. H., and V. J. McNicoll. New U-Pb dates from southwestern Coast Belt, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193341.

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Davidson, A., and O. van Breemen. U-Pb ages of granites near the Grenville Front, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/195176.

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Jones, S. L., J. R. Anderson, G. L. Fraser, C. J. Lewis, and S. M. McLennan. A U-Pb Geochronology Compilation for Northern Australia: Version 2, 2018. Geoscience Australia, 2018. http://dx.doi.org/10.11636/record.2018.049.

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Tuzzolino, A. L., P. B. O'Sullivan, L. K. Freeman, and R. J. Newberry. Zircon U-Pb age data, Ray Mountains area, Bettles Quadrangle, Alaska. Alaska Division of Geological & Geophysical Surveys, May 2016. http://dx.doi.org/10.14509/29662.

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Mortensen, J. K., R. I. Thorpe, W. A. Padgham, J. E. King, and W J Davis. U-Pb zircon ages for felsic volcanism in Slave Porvince, N.W.T. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/126606.

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Bevier, M. L., and R. G. Anderson. U - Pb and K - Ar Geochronometry, Iskut River area, Nw B.c. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131192.

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