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Academic literature on the topic 'Nd isotopy'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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Journal articles on the topic "Nd isotopy"

Azovskova, O. B., E. I. Soroka, M. Yu Rovnushkin, and N. G. Soloshenko. "Sm-Nd isotopy of the dykes of the Vorontsovskoe gold-ore deposit (Northern Urals)." Vestnik of Geosciences 9 (2020): 3–6. http://dx.doi.org/10.19110/geov.2020.9.1.

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The Vorontsovskoye gold-ore deposit (Northern Urals) generally corresponds to the Carlin-type. One of the deposit features is the presence of numerous dykes of mafic and middle chemical composition, of normal and increased alkalinity. Sm-Nd isotope studies for the first time confirmed the dykes formation age 340 ± 35 Ma. These data can be indicative of the post-collisional stage of magmatism in this area. The positive Nd values suggest a probable abyssal magmatic source of Nd.

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Martynov, Yu A., J. I. Kimura, A. I. Khanchuk, A. V. Rybin, A. A. Chashchin, and A. Yu Martynov. "Magmatic sources of quaternary lavas in the Kuril island arc: New data on Sr and Nd isotopy." Doklady Earth Sciences 417, no. 1 (2007): 1206–11. http://dx.doi.org/10.1134/s1028334x07080168.

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Moiseev, A. V., M. V. Luchitskaya, I. V. Gul’pa, V. B. Khubanov, and B. V. Belyatsky. "Vendian and Permian-Triassic plagiogranite magmatism of the Ust’-Belaya Mountains, West-Koryak fold system, Northeastern of Russia." Геотектоника, no. 1 (April 1, 2019): 87–114. http://dx.doi.org/10.31857/s0016-853x2019187-114.

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Vendian and Permian-Triassic plagiogranite magmatism is distinguished for Ust’-Belsky and Algansky terranes of West-Koryak fold system. U–Pb zircon ages from Vendian and Permian-Triassic plagiogranites are 556 ± 3 Ma (SIMS), 538 ± 7 Ma (LA–ICP–MS) and 235 ± 2 Ma (SIMS) consequently. It is revealed, that Vendian and Permian-Triassic plagiogranites are mainly low-K and low-Al. Sr–Nd isotopy and rare-earth element patterns allow supposing their formation by partial melting of primarily mantle substrate or by fractional crystallization of basic magma. Vendian plagiogranites formed within active margin in ensimatic island arc simultaneously with deposition of lower part of volcanic-sedimentary complex of Otrozhninskaya slice. We suggest the Permian-Triassic plagiogranites were being formed within the limits of Ust’-Belsky segment of Koni-Taigonos arc during partial melting of melanocratic ophiolite material build up as fragments in accretionary structure of that arc or by fractional crystallization of basic magmas melted from the similar substrate.

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Wu, Li, Ling, et al. "Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis." Minerals 9, no. 10 (2019): 583. http://dx.doi.org/10.3390/min9100583.

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The oxygen (O) and neodymium (Nd) isotopic composition of monazite provides an ideal tracer of metamorphism and hydrothermal activity. Calibration of the matrix effect and monitoring of the external precision of monazite O–Nd isotopes with microbeam techniques, such as secondary ion mass spectrometry (SIMS) and laser ablation-multicollector-inductively coupled plasma-mass spectrometry (LA-MC-ICPMS), require well-characterized natural monazite standards for precise microbeam measurements. However, the limited number of standards available is impeding the application of monazite O–Nd isotopes. Here, we report on the RW-1 monazite as a potential new working reference material for microbeam analysis of O–Nd isotopes. Microbeam measurements by electron probe microanalysis (EPMA), SIMS, and LA-MC-ICPMS at 10–24 µm scales have confirmed that it is homogeneous in both elemental and O–Nd isotopic compositions. SIMS measurements yield δ18O values consistent, within errors, with those obtained by laser fluorination techniques. Precise analyses of Nd isotope by thermal ionization mass spectrometry (TIMS) are consistent with mean results of LA-MC-ICPMS analyses. We recommend δ18O = 6.30‰ ± 0.16‰ (2SD) and 143Nd/144Nd = 0.512282 ± 0.000011 (2SD) as being the reference values for the RW-1 monazite.

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van de Flierdt, Tina, Alexander M. Griffiths, Myriam Lambelet, Susan H. Little, Torben Stichel, and David J. Wilson. "Neodymium in the oceans: a global database, a regional comparison and implications for palaeoceanographic research." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2081 (2016): 20150293. http://dx.doi.org/10.1098/rsta.2015.0293.

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The neodymium (Nd) isotopic composition of seawater has been used extensively to reconstruct ocean circulation on a variety of time scales. However, dissolved neodymium concentrations and isotopes do not always behave conservatively, and quantitative deconvolution of this non-conservative component can be used to detect trace metal inputs and isotopic exchange at ocean–sediment interfaces. In order to facilitate such comparisons for historical datasets, we here provide an extended global database for Nd isotopes and concentrations in the context of hydrography and nutrients. Since 2010, combined datasets for a large range of trace elements and isotopes are collected on international GEOTRACES section cruises, alongside classical nutrient and hydrography measurements. Here, we take a first step towards exploiting these datasets by comparing high-resolution Nd sections for the western and eastern North Atlantic in the context of hydrography, nutrients and aluminium (Al) concentrations. Evaluating those data in tracer–tracer space reveals that North Atlantic seawater Nd isotopes and concentrations generally follow the patterns of advection, as do Al concentrations. Deviations from water mass mixing are observed locally, associated with the addition or removal of trace metals in benthic nepheloid layers, exchange with ocean margins (i.e. boundary exchange) and/or exchange with particulate phases (i.e. reversible scavenging). We emphasize that the complexity of some of the new datasets cautions against a quantitative interpretation of individual palaeo Nd isotope records, and indicates the importance of spatial reconstructions for a more balanced approach to deciphering past ocean changes. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.

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PE-PIPER, GEORGIA, and DAVID J. W. PIPER. "Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models." Geological Magazine 138, no. 6 (2001): 653–68. http://dx.doi.org/10.1017/s0016756801005957.

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Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas. Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.

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Viehmann, Sebastian. "Hf-Nd Isotopes in Archean Marine Chemical Sediments: Implications for the Geodynamical History of Early Earth and Its Impact on Earliest Marine Habitats." Geosciences 8, no. 7 (2018): 263. http://dx.doi.org/10.3390/geosciences8070263.

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The Hf-Nd isotope systems are coupled in magmatic systems, but incongruent Hf weathering (‘zircon effect’) of the continental crust leads to a decoupling of the Hf-Nd isotope systems in low-temperature environments during weathering and erosion processes. The Hf-Nd isotope record was recently dated back from the Cenozoic oceans until the Archean, showing that both isotope systems were already decoupled in seawater 2.7 Ga ago and potentially 3.4 Ga and 3.7 Ga ago. While there might have existed a hydrothermal pathway for Hf into Archean seawater, incongruent Hf weathering of more evolved, zircon-bearing uppermost continental crust that was emerged and available for subaerial weathering accounts for a significant decoupling of Hf-Nd isotopes in the dissolved (<0.2 µm) and suspended (>0.2 µm) fractions of Early Earth’s seawater. These findings contradict the consensus that uppermost Archean continental crust was (ultra)mafic in composition and predominantly submerged. Hence, Hf-Nd isotopes in Archean marine chemical sediments provide the unique potential for future research to trace the emergence of evolved continental crust, which in turn has major implications for the geodynamical evolution of Early Earth and the nutrient flux into the earliest marine habitats on Earth.

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Tretyakov, A. A., A. V. Pilitsyna, K. E. Degtyarev, et al. "Neoproterozoic granitoid magmatism and granulite metamorphism in the Chu-Kendyktas terrane (Southern Kazakhstan, Central Asian Orogenic Belt): Zircon dating, Nd isotopy and tectono-magmatic evolution." Precambrian Research 332 (September 2019): 105397. http://dx.doi.org/10.1016/j.precamres.2019.105397.

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Abbott, April N., Brian A. Haley, Aradhna K. Tripati, and Martin Frank. "Constraints on ocean circulation at the Paleocene–Eocene Thermal Maximum from neodymium isotopes." Climate of the Past 12, no. 4 (2016): 837–47. http://dx.doi.org/10.5194/cp-12-837-2016.

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Abstract. Global warming during the Paleocene–Eocene Thermal Maximum (PETM) ∼ 55 million years ago (Ma) coincided with a massive release of carbon to the ocean–atmosphere system, as indicated by carbon isotopic data. Previous studies have argued for a role of changing ocean circulation, possibly as a trigger or response to climatic changes. We use neodymium (Nd) isotopic data to reconstruct short high-resolution records of deep-water circulation across the PETM. These records are derived by reductively leaching sediments from seven globally distributed sites to reconstruct past deep-ocean circulation across the PETM. The Nd data for the leachates are interpreted to be consistent with previous studies that have used fish teeth Nd isotopes and benthic foraminiferal δ13C to constrain regions of convection. There is some evidence from combining Nd isotope and δ13C records that the three major ocean basins may not have had substantial exchanges of deep waters. If the isotopic data are interpreted within this framework, then the observed pattern may be explained if the strength of overturning in each basin varied distinctly over the PETM, resulting in differences in deep-water aging gradients between basins. Results are consistent with published interpretations from proxy data and model simulations that suggest modulation of overturning circulation had an important role for initiation and recovery of the ocean–atmosphere system associated with the PETM.

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FELITSYN, SERGEI B., and ALEXANDER P. GUBANOV. "Nd isotope composition of early Cambrian discrete basins." Geological Magazine 139, no. 2 (2002): 159–69. http://dx.doi.org/10.1017/s0016756801006252.

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A Nd isotope map of early Cambrian epeiric basins has been inferred from the Nd isotopic signature recorded in phosphatic Small Shelly Fossils. The most radiogenic εNd(t) values characterize water reservoirs along the Avalonian and Cadomian belts, while εNd(t) values of −10 to −20 were obtained in Laurentia and East Gondwanan Australia and China. Such a distribution of Nd isotope signatures results from the different provenance of early Cambrian epeiric seas: juvenile magmatic arcs and/or cordilleran for Mongolia, Siberia, Iberia and adjacent terranes, and cratonic sources for Laurentia and East Gondwana. Biogenic apatite of Small Shelly Fossils may be a useful tool for mapping of Nd isotope composition and documenting water mass exchange between discrete basins.

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Dissertations / Theses on the topic "Nd isotopy"

Maurer, Victor Câmara. "Caracterização geocronológica (U-Pb), geoquímica e isotópica (Sr, Nd, Hf) do complexo Rio Capivari no terreno Embu." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-17062016-141231/.

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O Complexo Rio Capivari (CRC) é constituído por ortognaisses migmatíticos de composições graníticas a tonalíticas e anfibolitos subordinados (magmas toleíticos) em lascas tectônicas no Terreno Embu. As composições dos gnaisses do CRC são predominantemente cálcio-alcalinas a álcali-cálcicas. Idades U-Pb em núcleos de zircão com zoneamento oscilatório indicam cristalização magmática dos protólitos em três períodos principais 2.4, 2.2-2.1 e 2.0 Ga. Idades metamórficas foram reconhecidas em bordas de zircão totalmente escuras nas imagens de catodoluminescência e variam entre 620-590 Ma. A suíte sideriana (2.4 Ga) apresenta caráter juvenil, como evidenciado pelos valores positivos de \'\'épsilon\'\'IND.Nd\' (+3.8) e \'\'épsilon\'\'IND.Hf\' (+0.3 a +4.8) e pela ausência de núcleos de zircão herdado, comumente encontrados em rochas que sofreram retrabalhamento crustal. A suíte de idades riacianas (2.2-2.1 Ga) apresenta idades modelos TDM arqueanas (2.6-3.3 Ga), valores negativos de \'\'épsilon\'\'IND.Nd\' (-12.0 a -4.0) e negativos a levemente positivos de \'\'épsilon\'\'IND.Hf\' (-7.8 a +0.5). Portanto, tais rochas derivam de retrabalhamento de reservatórios crustais antigos. A suíte de idade orosiriana (2.0 Ga) apresenta fontes mais antigas e retrabalhadas com valores altamente negativos de \'\'épsilon\'\'IND.Nd\' (-10.4) e \'\'épsilon\'\'IND.Hf\' (-1.2 a -13.6), sugerindo prolongada residência crustal com idades modelo \'T IND.DM\' e \'T IND.Hf\' >3.3 Ga. As assinaturas de elementos traços em rocha total e a química de zircão sugerem fontes máficas para o gnaisse sideriano. Reservatórios de crosta média, mas de profundidades variáveis, parecem ser a principal fonte dos gnaisses riacianos e orosirianos. Análises em diagramas tectônicos discriminantes baseados em elementos traços de rocha total com elevadas razões \'La/Yb IND.(N)\' (>10), Nb/Yb (>2) e Th/Yb (>1), somados aos valores de \'Y IND.2\'\'O IND.3\' (<3000 ppm), U/Yb (>0.5) e Nb/Yb (0.01-0.10) da química de zircão, sugerem que ambas as suítes de idades foram geradas em ambientes de arco magmático continental, mas com um gap de 200-300 Ma entre o gnaisse sideriano e os gnaisses riacianos sem dados ou informações geológicas. Perfis multielementos (elementos traços) comparativos entre representação de amostras típicas de arco continental associado à subducção de crosta oceânica (margem andina) e amostras de arcos de ilha (Ilhas Mariana) confirmam afinidade com ambiente de arco continental para o CRC, associado à subducção de placa oceânica, principalmente para o gnaisse sideriano. Apesar de pouco representativo, devido ao número de amostras (n=1), uma acresção juvenil em 2.4 Ga colabora para uma dinâmica contínua da evolução da crosta continental. O papel desempenhado pelo CRC na evolução geral do Terreno Embu permanece enigmático. Os dados isotópicos de \'\'épsilon\'\'IND.Nd(590)\' e \'ANTPOT.87 Sr\'/\'ANTPOT.88 Sr IND.(i)\' do CRC (-27.3 a -19.7 e 0.704 a 0.722, respectivamente) indicam evolução temporal não compatível com o requerido para as fontes dos granitos ediacaranos do Terreno Embu, que exigem a participação de reservatórios mais primitivos (\'\'épsilon\'\'IND.Nd(590)\' -13 a -7) e empobrecidos em Rb (\'ANTPOT.87 Sr\'/\'ANTPOT.88 Sr IND.(i)\' \'\'QUASE IGUAL A\' 0,710).
The Rio Capivari Complex (RCC) comprises migmatitic orthogneisses with granitic to tonalitic compositions and subordinate amphibolites (tholeiitic magmas), that occur in tectonics contacts within the Embu Terrane. The RCC orthogneisses are predominantly calc-alkaline to alkali-calcic. U-Pb zircon ages obtained on oscillatory zoned zircon cores indicate protolith magmatic crystallization into three main periods 2.4, 2.2-2.1 and 2.0 Ga. CL-dark zircon rims yield dates between 620-590 Ma, interpreted as metamorphic overprinting. The Siderian suite (2.4 Ga) show juvenile character, as evidenced by positive \'\'épsilon\'\'IND.Nd(t)\' (+3.8) and \'\'épsilon\'\'IND.Hf(t)\' (+0.3 to +4.8) values and absence of inherited zircon grains, commonly found in reworking crustal rocks. The Rhyacian suite (2.2-2.1 Ga) has Archean model ages (\'T IND.DM\' = 2.6-3.3 Ga), negative values of \'\'épsilon\'\'IND.Nd(t)\' (-12.0 to -4.0) and negative to slightly positive \'\'épsilon\'\'IND.Hf(t)\' values (-7.8 to +0.5). Therefore, such rocks most likely derived from reworking of older crustal reservoirs. The Orosirian suite (2.0 Ga) has even older sources with strongly negative \'\'épsilon\'\'IND.Nd(t)\' (-10.4) and \'\'épsilon\'\'IND.Hf(t)\' (-1.2 to -13.6) suggesting prolonged crustal residence time with \'T IND.DM\' and \'T IND.HF\' > 3.3 Ga. Whole-rock trace element and zircon chemistry indicate mafic sources for the Siderian suite. Middle crust reservoirs, at varying depths, appear to be the main source of the Rhyacian and Orosirian suites. According to analysis in discriminating tectonic diagrams the whole rock trace elements with high ratios \'La/Yb IND.(N)\' (> 10), Nb/Yb (> 2) and Th/Yb (> 1), added to the amounts of \'Y IND.2\'\'O IND.3\' (<3,000 ppm), U/Yb (> 0.5) and Nb/Yb (0.01 to 0.10) from zircon chemistry, suggest that all three suites were generated on continental magmatic arc environments, but with a gap of 200-300 Ma between the Siderian suite and the Rhyacian and Orosirian suites without data or geological information. Comparative multi-elements profiles (trace elements) between representation of typical continental arc samples associated with the oceanic crust subduction (Andean margin) and samples of island arcs (Mariana Islands) confirm affinity with continental arc environment for the RCC, associated with subduction oceanic plate, mainly for the Siderian suite. In spite of the small dataset, the results of this study indicate a juvenile accretion at 2.4 Ga, what suggests a continuous dynamic of continental crust evolution. The RCC role on the tectonic evolution of the Embu terrane remains enigmatic. The isotopic data \'\'épsilon\'\'IND.Nd(590)\' and \'ANTPOT.87 Sr\'/\'ANTPOT.88 Sr(i)\' of the RCC (-27.3 to -19.7 and 0.704-0.722, respectively) indicate an evolution not compatible with the sources for the Ediacaran granites of the Embu Terrane, requiring the participation of more primitive reservoirs (\'\'épsilon\'\'IND.Nd(590)\' -13 to -7) (ANTPOT.87 Sr\'/\'ANTPOT.88 Sr(i)\'\'QUASE IGUAL A\' 0.710).

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Via, Rachael Kathleen. "Evolution of Atlantic deep-water circulation: from the greenhouse to the icehouse." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2609.

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To better understand how the evolution of Cenozoic deep-water circulation related to changes in global climate and ocean basin configuration, we generated Nd isotope records from Ocean Drilling Program sites in the southeastern Atlantic to track deep water mass composition through time. We used fossil fish debris from ODP Sites 1262-1264 (Leg 208), spanning present-day water depths of 2500-4750 m, to reconstruct the isotopic signature of deep waters over the past ~53 Ma. The data indicate an initial transition from relatively non-radiogenic values (??Nd=~-10) at 53 Ma to more radiogenic values (~-8.5) at ~32 Ma. From ~32 Ma to 3.85 Ma, the Nd signal becomes more nonradiogenic, ~-12.3 at the top of the record. Comparison of our data with Nd isotopic records derived from a North Atlantic Fe-Mn crust show similar non-radiogenic values (~-10.5) in the 53??32 Ma interval and a trend toward more non-radiogenic values beginning at ~20 Ma. The data likely reflect an overall shift from a Southern Ocean deep water source to the ultimate incursion of deep waters from the North Atlantic. The non-radiogenic values at the base of the record reflect a Southern Ocean source of deep water. The shift toward more radiogenic values indicates an increased contribution of Pacific waters to the Southern Ocean source as the tectonic gateways changed after ~35-33 Ma. The subsequent trend toward more non-radiogenic Nd isotope values is approximately concurrent with the increase of benthic foraminiferal ??18O values, based on comparison with a compilation of global data. Thus, changes in oceanic gateway configuration in addition to overall cooling and the build-up of continental ice on Antarctica may have altered the Nd isotope character of Southern Ocean deep waters during the early Oligocene.

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Nowicki, G. [Verfasser]. "Kernspektroskopische Untersuchungen der Isotone ¹³⁷Nd und ¹³⁹Sm / G. Nowicki." Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/118725276X/34.

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Bell, Nicholle Georgina Anneke. "Molecular-scale characterisation of humic substances using isotope-filtered nD NMR spectroscopy." Thesis, University of Edinburgh, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716584.

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Humic substances (HS), the complex mixture of organic molecules produced by microbial and abiotic degradation of plant and animals residues, are the major components of organic matter in soil and natural waters. As such, they are vital to the integrity of soil, play important roles in nutrient biogeochemical cycling and determine the mobility and fate of both nutrients and contaminants. How HS enact their varied roles, however, is largely unknown due to the lack of comprehension of their molecular make-up. What is known is that they contain aromatic (e.g. phenols, condensed aromatics) and aliphatic (e.g. carbohydrates, lipids) molecules with prevailing carboxyl and hydroxyl functionalities. As for other complex chromatographically inseparable mixtures, high-resolution analytical techniques such as Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) as well as Nuclear Magnetic Resonance (NMR) spectroscopy have been applied to study HS composition at the molecular level. While FT-ICR MS can provide molecular formulae, it is only NMR that can unveil structures. Until now, however, very few unambiguous structures of individual molecules have emerged from standard NMR experiments. This is because purposely designed multidimensional NMR experiments are required to achieve ‘spectroscopic separation’ where chromatography fails. In this work, ‘spectroscopic separation’ was accomplished with the aid of chemical modification in the form of 13C methylation of COOH and OH groups. 13C containing tags allow the observation of signals only from molecules carrying these tags. In combination with purposelydesigned isotope-filtered NMR experiments, these tags act as spies reporting on their surrounding structure. This is achieved by utilising scalar and dipolar couplings to transfer the polarisation between protons and carbons of the 13CH3O groups and nuclei of the parent molecules. The necessary spectral resolution is attained using 3D/4D NMR experiments. This approach provides access to an array of correlated chemical shifts of HS molecules and represents a paradigm shift in the use of tags in investigations of complex mixtures: instead of focusing only on the tags, they are used to obtain structural information from the molecules they are attached to. The compounds at the centre of this investigation are the phenols of HS. These molecules are thought to be important in many of the key processes in organic matter rich soils, particularly peat. For example, their accumulation is thought to impair the activity of extracellular enzymes essential for the degradation of peat HS. Understanding the nature and source of phenols would provide a more fundamental framework for rationalising their role in peat, as well as other carbon rich soils. The developed methodology was initially tested on model mixtures containing 3 or 9 phenolic compounds before applying it to a operational fraction of HS, fulvic acid, extracted from a Scottish raised peat bog. For this fulvic acid, over 30 major phenolic molecules/moieties were identified, many of which can be directly traced to the flora prevalent in the vicinity of the sampling site. For the first time in 150 years of HS research, a novel analytical methodology has yielded unambiguous structural information, providing the first steps towards understanding the various roles of HS in natural systems.

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Secchiari, Arianna. "Geochemical and Sr, Nd, Pb isotope investigation of the New Caledonia ophiolite." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT173.

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L’ophiolite de Nouvelle Calédonie présente une des plus grandes sections de manteau océanique obductées au monde, offrant une perspective unique pour l’étude des processus du manteau supérieur. Les roches du manteau appartiennent à une séquence ophiolitique “atypique”, dominée par des harzburgites réfractaires avec quelques lherzolites à spinelle et à plagioclase. À l'exception de quelques cumulats mafiques-ultramafiques, la partie crustale de l'ophiolite est totalement absente. Cette ophiolite a été étudiée depuis plusieurs décennies, toutefois sa nature ultra-appauvrie a rendu très difficile une caractérisation géochimique détaillée. La littérature scientifique ne regroupe que quelques données sur les éléments en trace et les données isotopiques sont totalement inexistantes. Dans ce travail de thèse, une étude géochimique exhaustive (éléments majeurs, en trace et isotopes Sr-Nd-Pb) des péridotites et des roches mafiques associées à l’ophiolite a été réalisée. Les péridotites sont des tectonites avec des textures porphyroclastiques. Les lherzolites à spinelle ont 7-8 vol.% de clinopyroxène riche en Na2O et Al2O3 (jusqu’à Na2O 0.5 wt.%; 6.5 wt.% Al2O3), teneur en Fo de l’olivine de 88.5 à 90.0 mol.%, bas valeurs du Cr# du spinelle (13-17), attestant la nature fertiles de ces roches. A l’inverse les harzburgites costituent des roches très réfractaires : ils ne contiennent pas de clinopyroxène primaire et les teneurs en Fo de l’olivine (90.9-92.9 mol.%), le Mg# de l’orthopyroxène et le Cr# du spinelle (39-71) sont élevés. Les spectres de concentrations en REE présentent des caractéristiques typiques de formation dans un environnement abyssal pour les lherzolites à spinelle, alors que les harzburgites ont des spectres en U typiques d’environnement d’avant-arc. Les compositions en REE des lherzolites à spinelle sont compatibles avec un bas degré de fusion fractionnée (8-9%) d'une source DMM, commençant dans le domaine de stabilité du grenat. Au contraire les concentrations en REE des harzburgites indiquent un haut degré de fusion d’une source DMM, en accord avec une fusion hydratée en environnement d’avant-arc. Les lherzolites à plagioclase présentent des microtextures d’imprégnation, des spinelles riches en Cr2O3 et TiO2 et un enrichissement progressif en REE, Ti, Y, Zr. Les modèles des éléments en trace indiquent que les lherzolites à plagioclase résultent des lherzolites à spinelle par séquestration des liquides MORB très appauvris au sein de la lithosphère océanique.Les roches intrusives sont des gabbronorites à olivine avec des compositions très appauvries (87.3≤Fo ol≤88.9 mol.%, 87.7≤Mg# Cpx≤92.2, An Pl=90-96 mol.%). Le haut Mg#, le bas teneur de TiO2 des pyroxènes, la composition en anorthite du plagioclase et le modèle des éléments en trace montrent que les magmas parents des gabbronorites sont des magmas primitifs, très appauvries, formés dans un environnement de subduction
The New Caledonia ophiolite hosts one of the largest obducted mantle section in the world, hence providing a unique insight for the study of upper mantle processes. These mantle rocks belong to an “atypical” ophiolitic sequence, which is dominated by refractory harzburgites but it also includes minor spinel and plagioclase lherzolites. Upper crust is notably absent in the ophiolite, with the exception of some mafic-ultramafic cumulates cropping out in the southern part of the island. Although the New Caledonia ophiolite has been under investigation for decades, its ultra-depleted nature has made its characterization an analytical challenge, so that few trace element data are available, while isotopic data are completely missing. In this thesis a comprehensive geochemical study (major, trace element and Sr-Nd-Pb isotopes) of the peridotites and the associated intrusive mafic rocks from the New Caledonia ophiolite has been carried out. The peridotites are low-strain tectonites showing porphyroclastic textures. Spinel lherzolites are undepleted lithotypes, as attested by the presence of 7-8 vol.% of Na2O and Al2O3-rich clinopyroxene (up to 0.5 wt.% Na2O; 6.5 wt.% Al2O3), Fo content of olivine (88.5-90.0 mol.%) and low Cr# of spinel (13-17). Conversely, harzburgites display a refractory nature, proven by the remarkable absence of primary clinopyroxene, very high Fo content in olivine (90.9-92.9 mol.%), high Mg# in orthopyroxene (89.8-94.2) and Cr# in spinel (39-71). REE contents show abyssal-type patterns for spinel lherzolites, while harzburgites display U-shaped patterns, typical of fore-arc settings.Spinel lherzolites REE compositions are consistent with relatively low degree (8-9%) of fractional melting of a DMM source, starting in the garnet stability field. Conversely, REE models for harzburgites indicate high melting degrees (20-25%) of a DMM mantle source under spinel faies conditions, consistent with hydrous melting in forearc setting. Plagioclase lherzolites exhibit melt impregnation microtextures, Cr- and TiO2-enriched spinels and REE, Ti, Y, Zr progressive increase with respect to spinel lherzolites. Impregnation models indicate that plagioclase lherzolites may derive from spinel lherzolites by entrapment of highly depleted MORB melts in the shallow oceanic lithosphere. Mafic intrusives are olivine gabbronorites with a very refractory composition, as attested by high Fo content of olivine (87.3-88.9 mol.%), very high Mg# of clinopyroxene (87.7-92.2) and extreme anorthitic content of plagioclase (An = 90-96 mol.%). The high Mg#, low TiO2 concentrations in pyroxenes and the anorthitic composition of plagioclase point out an origin from ultra-depleted primitive magmas in a convergent setting. Geochemical trace element models show that the parental melts of gabbronorites are primitive magmas with striking depleted compositions, bearing only in part similarities with the primitive boninitic melts of Bonin Islands. The first Sr, Nd and Pb isotope data obtained for the New Caledonia ophiolite highlight the presence of DM mantle source variably modified by different processes.Nd-Sr-Pb isotopic ratios for the lherzolites (+6.98≤ƐNdi≤+10.97) indicate a DM source that suffered low-temperature hydrothermal reactions. Harzburgites are characterized by a wide variation of Sr, Nd and Pb isotopic values, extending from DM-type to EMII compositions (-0.82≤ƐNdi≤+17.55), suggesting that harzburgite source was strongly affected by subduction-related processes. Conversely, combined trace element and Sr-Nd-Pb isotopic data for gabbronorites indicate a derivation from a source with composition similar to Indian-type mantle, but affected by fluid input in subduction environment

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Kay, Andrew. "Sm-Nd isotope, major element, and trace element geochemistry of the Nashoba terrane, eastern Massachusetts." Thesis, Boston College, 2012. http://hdl.handle.net/2345/bc-ir:107672.

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Thesis advisor: Christopher J. Hepburn
The Nashoba terrane in eastern Massachusetts comprises Cambrian-Ordovician mafic to felsic metavolcanic rocks and interlayered sediments metamorphosed during the mid-Paleozoic and intruded by a series of dioritic to granitic plutons during the Silurian to earliest Carboniferous. This work comprises two parts discussing the Sm-Nd isotope characteristics and major and trace element geochemistry of the Nashoba terrane: the first discusses the Cambrian-Ordovician metamorphosed units, the second discusses the Silurian-Carboniferous plutons. Part I: The Nashoba terrane in eastern Massachusetts lies between rocks of Ganderian affinity to the northwest and Avalonian affinity to the southeast. Its relationship to either domain was unclear and has been investigated. Major and trace element geochemical data indicate a mix of arc, MORB, and alkaline rift related signatures consistent with an origin of the terrane as a primitive volcanic arc-backarc complex built on thinned continental crust. Newly determined Sm-Nd isotopic data clarifies the original tectonic setting. Amphibolites of the Marlboro and Nashoba Formations have high εNd values (+4 to +7.5) consistent with formation in a primitive volcanic arc with minimal interaction between arc magmas and crust. Intermediate and felsic gneisses have moderate εNd values between +1.2 and –0.75 indicating a mixture of juvenile arc magmas and an evolved (likely basement) source. Depleted mantle model ages of 1.2 to 1.6 Ga indicate a Mesoproterozoic or older age for this source. Metasedimentary rocks have negative εNd values between –6 and –8.3 indicating derivation primarily from an isotopically evolved source (or sources). The model ages of these metasedimentary rocks (1.6 to 1.8 Ga) indicate a source area of Paleoproterozoic or older age. The εNd values and model ages of the intermediate and felsic rocks and metasedimentary rocks indicates that the basement to the Nashoba terrane is Ganderian rather than Avalonian. The Nashoba terrane therefore represents a southward continuation of Ganderian arc-backarc activity as typified by the Penobscot and/or Popelogan-Victoria arc systems and the Tetagouche-Exploits backarc basin in the northern Appalachians. Part II: Between 430 and 350 Ma the Nashoba terrane experienced episodic dioritic and granitic plutonism. Previous workers have suggested a supra-subduction zone setting for this magmatism based on the calc-alkaline nature of the diorites. Previously determined major and trace element geochemical data along with newly determined Sm-Nd isotopic data indicate that a subduction zone was active beneath the Nashoba terrane during the majority of the 430 to ca. 350 Ma magmatism (and likely throughout). Trace element geochemistry indicates a strong arc component in all magmas and suggests that the various Silurian to Carboniferous plutonic rocks of the Nashoba terrane could all have been derived by modification of a slightly enriched NMORB-type source via subduction zone input and crustal contamination. Most of the rocks from this period have intermediate εNd values consistent with contamination of juvenile magmas by an evolved source. The late Proterozoic model ages for most of these rocks suggest the Ganderian basement of the Nashoba terrane as the source of evolved material. One rhyolite from the nearby Newbury Volcanic Complex (of unknown affinity) has a moderately negative εNd value consistent with derivation by partial melting of Cambrian-Ordovician metasedimentary rocks of the Nashoba terrane. This suggests that the Newbury Volcanic Complex formed as the surface expression of mid-Paleozoic Nashoba terrane plutonism. Geochemical and isotopic similarities between the plutonic rocks of the Nashoba terrane and widespread contemporary Ganderian plutonism suggest that the Nashoba terrane remained a part of Ganderia during its transit and accretion to the Laurentian margin. Significantly younger model ages in the youngest granitic rocks indicate that Avalonian crust may have underthrust the Nashoba terrane after 400 Ma and contributed to the generation of these granites
Thesis (MS) — Boston College, 2012
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences

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Chen, Tianyu [Verfasser]. "The geochemical cycling and paleoceanographic application of combined oceanic Nd-Hf isotopes / Tianyu Chen." Kiel : Universitätsbibliothek Kiel, 2013. http://d-nb.info/1044891807/34.

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Thorogood, E. J. "Provenance of the pre-Devonian sediments of England and Wales : Sm-Nd isotopic evidence." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293429.

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Anglin, Carolyn Diane Carleton University Dissertation Geology. "Sm-Nd and Sr isotopic studies of scheelite from some Superior Province gold deposits." Ottawa, 1992.

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Simien, Frédéric. "Croissance crustale et contraintes paléogéographiques apportées par les isotopes du Nd dans les sédiments." Paris, Institut de physique du globe, 1998. http://www.theses.fr/1998GLOB0005.

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Il n'existe pas de consensus pour savoir si la masse continentale a été extraite du manteau très tôt dans l'Histoire de la Terre ou bien si elle a été différenciée au cours du temps. Les études en Sm-Nd apportent des contraintes à ce problème car l'isotope père et l'isotope fils sont presque exclusivement fractionnés lors d'un épisode de différenciation crustale. Il est donc possible de dater depuis quand les matériaux font partie de la croûte. L'application de ce couple aux shales permet une approche à grande échelle car ils représentent une moyenne de la croûte continentale. Les évolutions des compositions isotopiques en Nd des séries paléozoïques en Europe de l'ouest et dans l'est du Canada indiquent qu'il n'y a pas eu de grand apports de matériaux juvéniles dans la masse sédimentaire au cours du Paléozoïque, même durant les orogenèses. Les informations apportées par cette méthode peuvent contraindre les reconstructions paléogéographiques. En accord avec les données stratigraphiques et paléontologiques, nous proposons qu'il faille reconsidérer les modèles d'évolution géodynamique dans lesquels un océan Sud Armorcain séparait la Bretagne de l'Espagne au cours du Paléozoïque. Les données canadiennes nous permettent de proposer un modèle d'évolution pour les zones exotiques des Appalaches. Nous pensons que la zone Avalon se situait à proximité de l'Amérique du Sud à l'aube du Paléozoïque, puis qu'elle a été accolée au continent nord Américain vers l'Ordovicien moyen (450 Ma). Pour la zone Méguma, nous pensons qu'elle devrait être rattachée à l'Afrique de l'ouest au Protérozoïque supérieur puis qu'elle est entrée en collision avecle continent Nord américain au Carbonifère (300 Ma). Dans la dernière partie, la compilation des données isotopiques en Sm-Nd dans les sédiments détritiques à grain fin permet d'avoir une idée de l'évolution de la croûte à l'échelle globale depuis presque 4 Ga. Malheureusement, pour pouvoir déterminer la courbe de croissance crustale, il nous faudrait connaître le volume de sédiments injectés dans le manteau au cours du temps et la taille du réservoir de type manteau appauvri dans les temps très anciens.

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Books on the topic "Nd isotopy"

Vroon, Pieter Zeger. Subduction of continental material in the Banda Arc, eastern Indonesia: Sr-Nd-Pb isotope and trace-element evidence from volcanics and sediments. Faculteit Aardwetenschappen der Rijksuniversiteit Utrecht, 1992.

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Survey, Ontario Geological. Geochronology Compilation Map For Ontario : Sheet 2: Southern Ontario: Grenville : Province and Environs : rb-sr, nd-sm, U-pb, and Other Isotopic Systems. s.n, 1986.

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Kwon, Sung-Tack. Pb-Sr-Nd isotope study of the 100 to 2700 Ma old alkalic rock-carbonatite complexes in the Canadian Shield: Inferences on the geochemical and structural evolution of the mantle. University Microfilms International, 1987.

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A, Ayuso Robert, De Vivo B, and Geological Survey (U.S.), eds. A geochemical and isotopic (Nd-Pb) comparison of volcanic rocks erupted during the last 3,550 yrs. B.P. of interplinian activity of Somma-Vesuvius volcano, southern Italy. U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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A geochemical and isotopic (Nd-Pb) comparison of volcanic rocks erupted during the last 3,550 yrs. B.P. of interplinian activity of Somma-Vesuvius volcano, southern Italy. U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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Book chapters on the topic "Nd isotopy"

DePaolo, Donald J. "Overview of Nd Isotopic Variations." In Minerals and Rocks. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-48916-7_5.

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Tripathy, Gyana Ranjan, Sunil Kumar Singh, and S. Krishnaswami. "Sr and Nd Isotopes as Tracers of Chemical and Physical Erosion." In Advances in Isotope Geochemistry. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-10637-8_26.

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DePaolo, Donald J. "Igneous Processes and Nd Isotopic Variations." In Minerals and Rocks. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-48916-7_4.

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DePaolo, Donald J. "Correlation of Nd Isotopic Variations with Other Isotopic Variations." In Minerals and Rocks. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-48916-7_6.

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DePaolo, Donald J. "Nd Isotopes as Tracers in Planetary Evolution." In Minerals and Rocks. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-48916-7_3.

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Sukhoruchkin, S. I., and Z. N. Soroko. "Graphs for Isotopes of 60-Nd(Neodymium)." In Nuclei with Z = 55 - 100. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-70609-0_7686.

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Kinny, Peter D., and Roland Maas. "12. Lu-Hf and Sm-Nd isotope systems in zircon." In Zircon, edited by John M. Hanchar and Paul W. O. Hoskin. De Gruyter, 2003. http://dx.doi.org/10.1515/9781501509322-015.

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Tanimizu, Masaharu, and Tsuyoshi Tanaka. "Ce-Nd-Sr Isotope Systematics of Eucrites and Lunar Rocks." In Origin of Elements in the Solar System. Springer US, 2002. http://dx.doi.org/10.1007/0-306-46927-8_41.

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D'Antonio, Massimo, George R. Tilton, and Lucia Civetta. "Petrogenesis of Italian Alkaline Lavas Deduced from Pb-Sr-Nd Isotope Relationships." In Earth Processes: Reading the Isotopic Code. American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm095p0253.

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Okano, Osamu, and Mitsunobu Tatsumoto. "Petrogenesis of Ultramafic Xenoliths from Hawaii Inferred From Sr, Nd, and Pb Isotopes." In Earth Processes: Reading the Isotopic Code. American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm095p0135.

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Conference papers on the topic "Nd isotopy"

Asai, Shiho, Keisuke Okumura, Yukiko Hanzawa, et al. "Validation of Correlations Between Nd Isotopes and Difficult-to-Measure Nuclides Predicted With Burn-Up Calculation Code by Postirradiation Examination." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59086.

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Correlations between Nd isotopes and difficult-to-measure (DTM) nuclides, such as Se-79, Tc-99, Sn-126, and Cs-135, predicted using a calculation code have been validated by postirradiation examination (PIE). The calculation was performed with a burnup calculation code, MVP-BURN, using the updated nuclear data library JENDL-4.0. An irradiated PWR fuel with a burnup of 44.9 GWd/t and a cooling time of 7458 days was used as a standard sample. The concentrations of Nd isotopes in the sample solutions were determined by inductively coupled plasma mass spectrometry (ICP-MS) after purification by two consecutive anion-exchange separations. The ratios of Se-79 and Cs-135 to Nd isotopes (Nd-145, Nd-146, and Nd-145+Nd-146) calculated using MVP-BURN were in good agreement with PIE values within the deviations of 8% and 6%, respectively. This indicates that these calculated ratios are applicable to the scaling factors of Se-79 and Cs-135. For Tc-99 and Sn-126, the calculated values were respectively about 50% and 20% higher than the PIE values. These overestimations were mainly caused by the lack of the contribution of an insoluble residue to the measured concentrations.

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Ouhachi, M., M. R. Oudih, M. Fellah, and N. H. Allal. "Exotic decay investigation of Nd isotopes." In 1ST INTERNATIONAL CONFERENCE ON RADIATIONS AND APPLICATIONS (ICRA-2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5048147.

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Frossard, Paul, Maud Boyet, Audrey Bouvier, Pierre Bonnand, and Delphine Auclair. "Deciphering Nd and Sm Isotope Composition in Chondrites." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.755.

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Grigoriev, I. S., A. B. Diachkov, S. K. Kovalevich, et al. "Nd-150 isotope enrichment by laser selective photoionization method." In SPIE Proceedings, edited by Willy L. Bohn, Vladimir S. Golubev, Andrey A. Ionin, and Vladislav Y. Panchenko. SPIE, 2006. http://dx.doi.org/10.1117/12.660417.

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Lee, Seung-Gu, and Young-Rok Park. "REE, Nd, Sr and Eu Isotope Geochemistry of Anorthosite at Sancheong Area, Korea." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1443.

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Roberts, Daniel, Tu-Hann Lu, Pamela Gutierrez, Catherine Chauvel, and Edward Inglis. "High-Precision Nd and W Isotopic Measurements Using a Nu TIMS." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2208.

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Duggan, Brian Daniel. "HF-ND ISOTOPES OF EQUATORIAL PACIFIC OXYHYDROXIDE LEACHATES ACROSS THE EOT." In 65th Annual Southeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016se-273830.

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An, Emily, Ellen Martin, Kelly Deuerling, and Jonathan B. Martin. "IMPACT OF GLACIAL RETREAT AND WEATHERING ON NORTH ATLANTIC ND ISOTOPES." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357831.

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Rahlf, Peer, Georgi Laukert, Edmund Hathorne, and Martin Frank. "Congo River Influence on the Atlantic’s Rare Earth Element and Nd/Hf Isotope Distributions." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2157.

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Tilhac, Romain, Graham C. Begg, Suzanne Yvette O'Reilly, and William L. Griffin. "Hf-Nd Isotope Decoupling in the Mantle: A Brief Review and New Geodynamic Perspectives." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2600.

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Reports on the topic "Nd isotopy"

Roddick, J. C., R. W. Sullivan, and F. O. Dudas. Precise Calibration of Tracer Compositions For Sm - Nd Isotopic Studies. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132926.

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Peterson, T. D., S. Pehrsson, T. Skulski, and H. Sandeman. Compilation of Sm-Nd isotope analyses of igneous suites, western Churchill Province. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/285360.

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Ahmad, I., C. J. Lister, and L. R. Morss. Lifetimes in neutron-rich Nd isotopes measured by Doppler profile method. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/166329.

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Snow, Mathew S., Theresa Giglio, John Olson, et al. Quantification of ⁸⁵Rb, ¹³⁶Ce, ¹⁴²Nd and ¹⁵⁰Nd Enriched Isotope Standards. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1408520.

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KIM, H., M. HERMAN, S. F. MUGHABGHAB, P. OBLOZINSKY, D. ROCHMAN, and LEE. Y.-O. EVALUATION OF NEUTRON CROSS SECTIONS FOR A COMPLETE SET OF Nd ISOTOPES. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/921937.

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Anglin, C. D. Preliminary Sm - Nd Isotopic Analyses of Scheelites From Val D'or Gold Deposits, Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131262.

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Whalen, J. B., R. A. Stern, N. Rayner, et al. Flin Flon TGI3 digital compilation of Shield margin NATMAP Nd isotopic and geochemical data. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2008. http://dx.doi.org/10.4095/224747.

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Mitchell, R. K., O. van Breemen, W. J. Davis, and R. Buenviaje. Sm-Nd isotopic data from the Canadian Shield north of 60 degrees latitude, northern Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/287188.

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Thériault, R. J. Reconnaissance Nd isotopic study of the Paleoproterozoic rocks of Meta Incognita Peninsula, southern Baffin Island, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/210056.

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Theriault, R. J. Methods for Rb-Sr and Sm-Nd isotopic analyses at the geochronology laboratory, Geological Survey of Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129062.

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