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Journal articles on the topic 'Sedimentary Crystallization'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Kazim, Muna Faraj, Muthana khleel Ibrahiem, and Ahmed R. Abd ElLatif. "Effect of Sedimentary Environment in Iron and Manganese Crystallization Index of some Soil of Anbar Government." IOP Conference Series: Earth and Environmental Science 1262, no. 8 (2023): 082043. http://dx.doi.org/10.1088/1755-1315/1262/8/082043.

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Abstract This study was conducted to elucidate the impact of depositional conditions on different sedimentary and desert environments on the crystallization index of iron and manganese. The study area is located within the administrative boundaries of Anbar Governorate. Eight desert valleys were selected, including Al-Qaim Valley, Al-Mohammadi Valley, Al-Damamah Valley, Hauran Valley, Al-Baghdadi Valley, Zaghdan Valley, Al-Sahliyah Valley, and Al-Sheikh Hadeed Valley, with two pedons per site, one in the sedimentary deposits and one in the desert deposits. The samples were prepared for laborat

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2

Doig, Ronald, J. Brendan Murphy, and R. Damian Nance. "U–Pb geochronology of Late Proterozoic rocks of the eastern Cobequid Highlands, Avalon Composite Terrane, Nova Scotia." Canadian Journal of Earth Sciences 28, no. 4 (1991): 504–11. http://dx.doi.org/10.1139/e91-044.

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In the Cobequid Highlands of Nova Scotia, low-grade late Precambrian arc-related volcano-sedimentry rocks typical of the Avalon Composite Terrane overlie platformal metasedimentry rocks and are spatially associated with gneisses previously considered to be basement to both these units. U–Pb zircon dates of 580–587 Ma from an orthogneiss and an amphibolite are similar to the U–Pb zircon dates of 580–610 Ma from both syntectonic granites in ductile shear zones and high-level posttectonic plutons that intruded the Avalonian successions. Hence, the gneisses do not represent basement but are an int

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Glushkova, V. E., I. S. Peretyazhko, E. A. Savina, and Е. А. Khromova. "Minerals of the Olivine Group from Melilite–Nepheline Paralavas of Combustion Metamorphic Complexes of Mongolia." Zapiski RMO (Proceedings of the Russian Mineralogical Society) CLII, no. 1 (2023): 61–77. http://dx.doi.org/10.31857/s0869605523010045.

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Olivine group minerals were formed in melilite-nepheline paralavas in two combustion metamorphic (CM) complexes as result of thermal alterations of sedimentary rocks caused by multistage current and quaternary wild coal fires. Products of decomposition of the olivine solid solution into Ca-bearing fayalite and kirschsteinite have been found in paralavas of the Khamaryn–Khural–Khiid CM complex. And, besides these two minerals, forterite–fayalite, monticellite–kirschsteinite and simplectite intergrowths of kirschsteinite with nepheline were detected in paralavas of the Nyalga PM complex. Olivine

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Peretyazhko, Igor S., and Elena A. Savina. "Melting Processes of Pelitic Rocks in Combustion Metamorphic Complexes of Mongolia: Mineral Chemistry, Raman Spectroscopy, Formation Conditions of Mullite, Silicate Spinel, Silica Polymorphs, and Cordierite-Group Minerals." Geosciences 13, no. 12 (2023): 377. http://dx.doi.org/10.3390/geosciences13120377.

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Melted rocks (clinkers and paralavas) of the Mongolian combustion metamorphic (CM) complexes were formed during modern and ancient (since the Quaternary) wild-fires of brown coal layers in the sedimentary strata of the Early Cretaceous Dzunbain Formation. According to XRD, Raman spectroscopy, and SEM-EDS data, cordierite, sekaninaite, indialite, ferroindialite, silica polymorphs, mullite, Fe-mullite, anhydrous Al-Fe-Mg silicate spinel (presumably new mineral), and other phases were identified. It has been established that isomorphic impurity of potassium in the cordierite-group minerals does n

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Putnis, Andrew, Manuel Prieto, and Lurdes Fernandez-Diaz. "Fluid supersaturation and crystallization in porous media." Geological Magazine 132, no. 1 (1995): 1–13. http://dx.doi.org/10.1017/s0016756800011389.

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AbstractThe relationship between the supersaturation at the point of crystallization and the rate at which supersaturation increases has been studied from nucleation experiments on barite BaSO4, strontianite SrCO3, witherite BaCO3 and gypsum CaSO4.2H2O. The crystallization experiments have been carried out by the counter-diifusion of cations and anions through a column of porous silica gel transport medium. Nucleation is suppressed in a finely-porous medium resulting in very high values of supersaturation before crystallization from the solution begins. This threshold supersaturation for nucle

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6

Machado, Marcos Da Silva, Guilherme Loriato Potratz, Marcio Ignacio Alves, et al. "SHRIMP U-PB DATA OF THE PALEOPROTEROZOIC, REGIÃO DOS LAGOS COMPLEX, RIO DE JANEIRO, BRAZIL: IMPLICATIONS TO RIBEIRA BELT EVOLUTION." Journal of Sedimentary Environments 2, no. 4 (2008): 301–18. http://dx.doi.org/10.12957/jse.2017.32650.

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The studied region is located in the Rio de Janeiro State (SE, Brazil) and is part of the Ribeira Belt, in the central portion of the Mantiqueira Province. The rocks of this region were included in the Brasiliano/Pan-African orogeny, from Neoproterozoic to the early Paleozoic. The basement is comprised of Paleoproterozoic rocks, sedimentary and volcano-sedimentary rocks from Mesoproterozoic and Neoproterozoic and intrusive granitic rocks from the Neoproterozoic. These rocks are interpreted as associations of magmatic arcs, sedimentary sequences of passive margins and tardi-kinematic granites,

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García-Romero, Emilia, and Mercedes Suárez. "A structure-based argument for non-classical crystal growth in natural clay minerals." Mineralogical Magazine 82, no. 1 (2018): 171–80. http://dx.doi.org/10.1180/minmag.2017.081.031.

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ABSTRACTEvidence of crystallization by particle attachment in synthetic materials is described in numerous contributions. However, efforts to establish the contribution of the particle attachment mechanism to inorganic crystallization in natural environments have barely begun. Here, we show, for the first time, evidence that confirms oriented particle attachment as a crystal growth mechanism that is relevant in sedimentary environments. In these natural settings, oriented particle attachment operates during the formation of highly anisotropically structured clay minerals, which constitute one

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8

Minguez, Jose Maria, and Javier Elorza. "Diagenetic volume-for-volume replacement: force of crystallization and depression of dissolution." Mineralogical Magazine 58, no. 390 (1994): 135–42. http://dx.doi.org/10.1180/minmag.1994.058.390.12.

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AbstractThe concept of force of crystallization is combined with that of depression of dissolution to explain diagenetic volume-for-volume replacement in both cases, either when the pressure is increased in early sedimentary settings, or when it is diminished in a late exposure. Also, a new textural criterion is added to the three classical ones in order to recognize diagenetic volume-for-volume replacement, and calculations are carried out to estimate the speed of the replacement.

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Alexeev, N. L., V. A. Maslov, V. D. Kaminsky, et al. "New data on the age of metamorphic rocks from the granite-greenstone ruker terrane (the southern Prince Charles Mountains, East Antarctica)." Доклады Академии наук 487, no. 6 (2019): 644–49. http://dx.doi.org/10.31857/s0869-56524876644-649.

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Paper presents results of isotope studies of primary igneous and sedimentary rocks of Mawson and Menzies series from the southern Prince Charles Mountains, East Antarctica. Obtained data show that igneous protholith crystallization of Mawson orthogneiss occurred at 3164,2±9,2-3163,2±7,8 Ma ago. The Mawson orthogneiss were a basement for Menzies series sediment. The maximum time of sediment deposition is estimated to be in the range of 3,0-3,1 Ga. Sediment protholith involves an admixture of Paleoarchean material.

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Pereira, Manuel Francisco, Cristina Gama, Ícaro Dias da Silva, et al. "Chronostratigraphic framework and provenance of the Ossa-Morena Zone Carboniferous basins (southwest Iberia)." Solid Earth 11, no. 4 (2020): 1291–312. http://dx.doi.org/10.5194/se-11-1291-2020.

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Abstract. Carboniferous siliciclastic and silicic magmatic rocks from the Santa Susana–São Cristovão and Cabrela regions contain valuable information regarding the timing of synorogenic processes in SW Iberia. In this region of the Ossa-Morena Zone (OMZ), late Carboniferous terrigenous strata (i.e., the Santa Susana Formation) unconformably overlie early Carboniferous marine siliciclastic deposits alternating with volcanic rocks (i.e., the Toca da Moura volcano-sedimentary complex). Lying below this intra-Carboniferous unconformity, the Toca da Moura volcano-sedimentary complex is intruded and

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Abdelhamid, Marzouk Mohamed Aly, B. G. Mousa, Hassan Waqas, et al. "Artificial Thermal Quenching and Salt Crystallization Weathering Processes for the Assessment of Long-Term Degradation Characteristics of Some Sedimentary Rocks, Egypt." Minerals 12, no. 11 (2022): 1393. http://dx.doi.org/10.3390/min12111393.

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This research aims at investigating the deterioration of limestone rocks due to the influences of thermal quenching and salt crystallization weathering tests and predicting their long-term durability. Therefore, six types of limestones were quarried from different provinces of Egypt and subjected to 50 cycles of thermal quenching and 25 cycles of salt crystallization weathering processes. The porosity, Schmidt hammer rebound hardness, ultrasound pulse velocity, Brazilian tensile strength, and uniaxial compression strength were determined before and after weathering processes. In addition, the

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Garda, Gianna M., Paulo Beljavskis, Caetano Juliani, and Dailto Silva. "Geochemistry of tourmalines associated with iron formation and quartz veins of the Morro da Pedra Preta Formation, Serra do Itaberaba Group (São Paulo, Brazil)." Anais da Academia Brasileira de Ciências 75, no. 2 (2003): 209–34. http://dx.doi.org/10.1590/s0001-37652003000200008.

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Tourmalines of intermediate schorl-dravite composition occur in iron formation (including metachert and tourmalinites), metasediments, calc-silicate and metabasic/intermediate rocks of the Morro da Pedra Preta Formation, a volcanic-sedimentary sequence of the Serra do Itaberaba Group (northeast of São Paulo City, southeastern Brazil). The Morro da Pedra Preta Formation is crosscut by quartz veins that contain both intermediate schorl-dravite and an alkali-deficient, Cr-(V-)bearing tourmaline, in which the occupancy of the X-site is ϑ0.51Ca0.33Na0.15, characterizing it as intermediate to foitit

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13

FISCHEL, DANIELLE P., MÁRCIO M. PIMENTEL, REINHARDT A. FUCK, and RICHARD ARMSTRONG. "U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil." Anais da Academia Brasileira de Ciências 73, no. 3 (2001): 445–60. http://dx.doi.org/10.1590/s0001-37652001000300012.

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U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanic sample yielded 2115 ± 23 Ma and from the granite yielded 2089 ± 14 Ma, interpreted as crystallization ages of these rocks. Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicating a crystallization age of 2262 ± 110 Ma and positive epsilonNd(T) = +3.0 interpreted as a juvenile magmatic event. Nd isotopic analyses on samples from the Jurubat

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14

NZALI, Timothée, Jean-Clair DUCHESNE, Christiane JACQUEMIN, and Jacqueline VANDER AUWERA. "Pyrométamorphisme induit par la gazéification souterraine de niveaux charbonneux du Westphalien dans le bassin de Mons (Belgique) [Pyrometamorphism induced by underground coal gasification of Westphalian beds in the Mons basin (Belgium)]." Geologica Belgica 2, no. 3-4 (2000): 221–34. http://dx.doi.org/10.20341/gb.2014.020.

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During the underground coal gasification experiment conducted at Thulin (Belgium), partial melting occurred in the surrounding rocks (Westphalian shales and sandstones). Samples were collected at the roof of the coal bed. Minerals which crystallized from the partial melts were identified under the polarizing microscope, with electron probe microanalysis, by X-ray diffraction and scanning electron microscopy. They include cordierite, orthopyroxene, olivine, spinel, cristobalite, mullite, osumilite, K-feldspar, ilmenite, hematite, wollastonite, calcite, andradite, monticellite, pyrrhotite, and c

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15

Angeli, Matthieu, David Benavente, Jean-Philippe Bigas, Béatriz Menéndez, Ronan Hébert, and Christian David. "Modification of the porous network by salt crystallization in experimentally weathered sedimentary stones." Materials and Structures 41, no. 6 (2007): 1091–108. http://dx.doi.org/10.1617/s11527-007-9308-z.

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16

Zbar, Omar kreem Obied, and Muthana Khleel Ibrahiem Alrfaae. "CALCULATION OF CRYSTALLIZATION INDEX OF IRON AND MANGANESE UNDER TWO DIFFERENT SEDIMENTARY ENVIRONMENTS." IRAQI JOURNAL OF DESERT STUDIES 9, no. 1 (2019): 50–56. http://dx.doi.org/10.36531/ijds.2019.172606.

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17

Farahi, Farzaneh, Saeed Taki, and Mojgan Salavati. "Mineral chemistry and geothermobarometry of gabbroic rocks from the Gysel area, Alborz mountains, north Iran." Nexo Revista Científica 33, no. 02 (2020): 392–408. http://dx.doi.org/10.5377/nexo.v33i02.10779.

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The gabbroic rocks in the Gysel area of the Central Alborz Mountains in north Iran are intruded into the Eocene Volcano-sedimentary units. The main gabbroic rocks varieties include gabbro porphyry, olivine gabbro, olivine dolerite and olivine monzo-gabbro. The main minerals phases in the rocks are plagioclase and pyroxene and the chief textures are sub-hedral granular, trachytoidic, porphyritic, intergranular and poikilitic. Electron microprobe analyses on minerals in the rock samples shows that plagioclase composition ranges from labradorite to bytonite, with oscillatory and normal chemical z

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18

Harnois, Luc, and Ross K. Stevenson. "Major and trace elements geochemistry of basalts and trachyphonolites from Huahine Island, Society archipelago (French Polynesia)." Bulletin de la Société Géologique de France 177, no. 4 (2006): 179–90. http://dx.doi.org/10.2113/gssgfbull.177.4.179.

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Abstract Basalts and trachyphonolites from Huahine Island (Society archipelago) have been analyzed for major elements and several trace elements (including rare earth elements). Eight basalts from the nearby Bora Bora Island were also analyzed for comparison. Ni-MgO, Ni-Ba, and Ni-Rb modeling indicates that the abundances of these elements in Huahine basalts cannot be entirely the result of crystallization and/or accumulation of olivine and reflect a variability already present in a heterogeneous source, a conclusion supported by Pb and Ce data. The chemical variability of Huahine basalts, wit

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Silva, Adriano Guilherme da, Cícera Neysi de Almeida, Sérgio de Castro Valente, and Leonardo Fonseca Borghi de Almeida. "The petrogenesis of tholeiitic diabases in eastern Parnaíba Basin: evidence for geochemical heterogeneities in the subcontinental lithospheric mantle in NE Brazil." Brazilian Journal of Geology 47, no. 1 (2017): 109–26. http://dx.doi.org/10.1590/2317-4889201720160041.

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ABSTRACT: The sedimentary rocks within the Paleozoic Parnaiba basin in NE Brazil were intruded by voluminous tholeiitic diabase sills and covered by coeval basaltic flows. This paper presents lithogeochemical data of borehole samples obtained from wells located in the eastern portion of the Parnaiba basin. The diabases are subalkaline tholeiitc rocks comprising three high-TiO2 and three low-TiO2 suites that are unrelated by differentiation processes. Fractional crystallization of olivine and augite was the predominantly evolutionary processes within individual high- and low-TiO2 suites as depi

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Brenchley, Patrick, Nigel Trewin, Philip Stone, et al. "The scale-dependence of strata-time relations: implications for stratigraphic classification." Stratigraphy 4, no. 2-3 (2007): 139–44. http://dx.doi.org/10.29041/strat.04.2.07.

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The establishment of chronostratigraphic units such as geological Systems and Series depends upon an ability to equate succession in rock strata with the passage of time, and upon a pervasive Law of Superposition. These assumptions hold true at a gross scale. But, at fine scales of stratigraphic resolution, they commonly break down. Thus, bioturbation in Phanerozoic marine deposits typically homogenizes sedimentary packages spanning millennia, affecting biostratigraphic, isotopic and paleomagnetic signals, and post-burial mass transport phenomena such as large-scale sedimentary slumps and intr

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Ye, Risheng, Jingxin Zhao, Zhiyi Wang, Weiyong Li, Jun He, and Fukun Chen. "Single-Grain Detrital Apatite Sr Isotopic Composition as an Indicator to Trace Sedimentary Sources: A Case Study of Sedimentary Rocks in the Hui-Cheng Basin, South Qinling, China." Minerals 13, no. 8 (2023): 1010. http://dx.doi.org/10.3390/min13081010.

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Sediments or clastic rocks can record the evolution history of basins, orogenic processes, crustal uplift and erosion, and even paleo-environments. Detrital minerals such as zircon, garnet, and apatite are useful media for studies of sedimentary sources and basin evolution. Detrital zircon has been widely taken as an indicator for provenances and tectonic evolution of geological terrenes via age distribution patterns. Apatite can remain stable during erosion and transportation and is also considered as an ideal object for source tracing. This mineral normally contains high Sr and negligible Rb

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McCUTCHEON, S. R., H. E. ANDERSON, and P. T. ROBINSON. "Stratigraphy and eruptive history of the Late Devonian Mount Pleasant Caldera Complex, Canadian Appalachians." Geological Magazine 134, no. 1 (1997): 17–36. http://dx.doi.org/10.1017/s0016756897006213.

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Stratigraphic, petrographic and geochemical evidence indicate that the volcano-sedimentary rocks of the Late Devonian Piskahegan Group, located in the northern Appalachians of southwestern New Brunswick, represent the eroded remnants of a large epicontinental caldera complex. This complex – the Mount Pleasant Caldera – is one of few recognizable pre-Cenozoic calderas and is divisible into Exocaldera, Intracaldera and Late Caldera-Fill sequences. The Intracaldera Sequence comprises four formations that crop out in a triangular-shaped area and includes: thick ash flow tuffs, thick sedimentary br

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Gerbi, C. C., S. E. Johnson, and J. N. Aleinikoff. "Origin and orogenic role of the Chain Lakes massif, Maine and Quebec." Canadian Journal of Earth Sciences 43, no. 3 (2006): 339–66. http://dx.doi.org/10.1139/e05-112.

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The Chain Lakes massif has long been an enigmatic component of the Appalachian orogen, but new structural, microstructural, and geochronological information provides the basis for the following new interpretation of the massif and its history. In the early Paleozoic, sediments and volcanic rocks from Laurentia or a Laurentian-derived microcontinent were deposited in a fore-arc basin on the western margin of the Iapetus ocean. Following intrusion of arc-related magmas, the sedimentaryvolcanic sequence was heated sufficiently to melt in place, resulting in stratigraphic disaggregation and diate

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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 ma

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Thorpe, R. S., J. W. Gaskarth, and P. J. Henney. "Composite Ordovician lamprophyre (spessartite) intrusions around the Midlands Microcraton in central Britain." Geological Magazine 130, no. 5 (1993): 657–63. http://dx.doi.org/10.1017/s0016756800020963.

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AbstractLamprophyre sills and dykes of Ordovician age were emplaced within Cambrian–Lower Ordovician sedimentary rocks around the northern margins of the Midlands Microcraton. The intrusions show internal mineralogical and chemical variations indicating emplacement as multiple intrusions of co-magmatic pulses. The chemical characteristics of the lamprophyre magmas indicate formation by small-degree volatile-rich partial melting of lithospheric mantle enriched and modified by Lower Palaeozoic subduction (Th/Ta 5.3–11.6, La/Ta 29–82.3), together with a contribution from within-plate mantle sourc

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Zhang, Fangfu, Huifang Xu, Evgenya S. Shelobolina, Hiromi Konishi, and Eric E. Roden. "Precipitation of low-temperature disordered dolomite induced by extracellular polymeric substances of methanogenic Archaea Methanosarcina barkeri: Implications for sedimentary dolomite formation." American Mineralogist 106, no. 1 (2021): 69–81. http://dx.doi.org/10.2138/am-2020-7381.

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Abstract A correlation between methanogenesis and dolomite formation has been reported; however, the mechanism underlying this association is not fully understood. In this study, we conducted forced carbonate precipitation experiments at room temperature in calcite-seeded Ca/Mg carbonate solutions containing either purified non-living biomass or bound extracellular polymeric substances (EPS) of the methanogen Methanosarcina barkeri. Purified non-living biomass and bound EPS was used so as to avoid the possible influence of the complex components of the growing microbial culture on carbonate cr

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Alves, Carlos, and Carlos Figueiredo. "Approaches to the Study of Salt Weathering of Geological Materials." Proceedings 24, no. 1 (2019): 5. http://dx.doi.org/10.3390/iecg2019-06198.

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Salt weathering is the main erosive process affecting diverse geological materials in historical and contemporary structures and can also contribute to visual changes by surface crystallization. The main goal of the present paper is to assess publications concerning the study of salt weathering of natural stone considering the main approaches (laboratory tests and field observations). Our focus will be on rock types other than sedimentary carbonate rocks and sandstones (which are the most studied rocks both in laboratory and field studies). Granite and pyroclastic rocks are dominant in the stu

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Murari, R., P. Krishnamurthy, K. S. Gopalan, G. V. Nesterekno, and P. I. Tihonenko. "High-Alumina Hypersthene in a Basalt Flow from Mt. Sundook, Siberian Traps, Russia." Journal Geological Society of India 41, no. 6 (1993): 509–12. http://dx.doi.org/10.17491/jgsi/1993/410603.

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Abstract Electron probe microanalysis (EPMA) and preliminary x- ray diffraction studies on a basalt flow from Mt.Sundook have revealed the presence of rare high-alumina hypersthene in the groundmass. The basalt occurs at the base of a 800 m flow sequence (Ivakinsky and Syverminsky suite) that unconformably overlies a Permo-Carboniferous sedimentary sequences. It is postulated that besides normal processes of fractionation, assimilation-fractional Crystallization (AFC) processes involving the parental magma and crustal components (pelitic sedinientary rocks) were responsible for the formation o

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Sang, Miao, Wenjiao Xiao, Brian F. Windley, et al. "From Middle Neoproterozoic Extension to Paleozoic Accretion and Collision of the Eastern Tiklik Belt (the Western Kunlun Orogen, NW China)." Minerals 12, no. 2 (2022): 166. http://dx.doi.org/10.3390/min12020166.

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The eastern Tiklik belt is mainly composed of meta-sedimentary rocks of the Ailiankate and Sailajiazitage Groups that were previously interpreted as Palaeoproterozoic, Mesoproterozic and Neoproterozoic stratigraphic units, which are part of the Tarim Precambrian basement. Our new detrital (U-Pb) zircon ages yield a dominant single peak with a major range between ca. 700 Ma and 800 Ma for meta-sedimentary rocks from both the Ailiankate and Sailajiazitage Groups, which demonstrates that they were mainly derived from an independent Neoproterozoic terrane. There are several ages of 444–659 Ma, of

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Dudás, Francis Ö., and Rigel L. Lustwerk. "Geochemistry of the Little Dal basalts: continental tholeiites from the Mackenzie Mountains, Northwest Territories, Canada." Canadian Journal of Earth Sciences 34, no. 1 (1997): 50–58. http://dx.doi.org/10.1139/e17-004.

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Analyses of the Little Dal lavas and the 779 Ma Tsezotene sills, both of the Mackenzie Mountains Supergroup, Northwest Territories, Canada, show them to be continental tholeiites that are geochemically related. The plagioclase- and clinopyroxene-phyric lavas are geochemically evolved and enriched in iron (up to 20.2 wt.% as Fe2O3). Two magmatic lineages are identifiable and may represent different degrees of partial melting in the same source region, but cannot be related by fractional crystallization. Within each lineage, geochemical variation can be explained by fractional crystallization in

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Beyarslan, Melahat, and A. Feyzi Bingöl. "Petrology of a supra-subduction zone ophiolite (Elaz1g, Turkey)." Canadian Journal of Earth Sciences 37, no. 10 (2000): 1411–24. http://dx.doi.org/10.1139/e00-041.

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The Elaz1g region in eastern Taurus, Turkey, exposes Paleozoic-Tertiary metamorphic, magmatic, and sedimentary units. Contacts between the different units are mostly tectonic, but there are also primary sedimentary, and intrusive contacts. The metamorphic rocks of the Elaz1g region are the Bitlis-Pütürge and Keban-Malatya massifs, which are a single tectonostratigraphic unit that has been tectonically disrupted and fragmented during the Upper Cretaceous. Magmatic rocks in the region are represented by ophiolitic units, magmatic arc products, and young volcanic rocks. The sedimentary units are

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Yu, Yi-chang, Zhi-wei Li, Bo-heng Shen, et al. "Differential Diagenesis and Pore Evolution Characteristics of Different Sedimentary Microfacies Reservoirs of Bioclastic Limestone: A Case Study of MB2-MC1 Section in X Oilfield in The Middle East." Journal of Physics: Conference Series 2594, no. 1 (2023): 012046. http://dx.doi.org/10.1088/1742-6596/2594/1/012046.

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Abstract In order to clarify the differential diagenesis of different sedimentary microfacies of bioclastic limestone in Cretaceous M Formation in the Middle East and systematically analyze the characteristics of reservoir pore evolution, the data of regional geology, well logging, core, cast thin section, scanning electron microscope, three-dimensional CT and conventional porosity and permeability test are comprehensively used, taking MB2-MC1 section in X oilfield as an example, starting from the diagenesis and pore evolution of bioclastic-arene shoal, the characteristics of diagenesis of eac

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Nikulin, Iv Iv, N. M. Boeva, S. V. Soboleva, and N. S. Bortnikov. "PALEOCENE GLAUCONITE OF THE NEAR-VOLGA MONOCLINE OF SUBMARINE VOLCANIC-SEDIMENTARY GENESIS." Доклады Российской академии наук. Науки о Земле 512, no. 1 (2023): 72–84. http://dx.doi.org/10.31857/s268673972360114x.

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A new concept of the formation of glauconite from the Paleocene deposits of the sedimentary cover of the southwestern part of the Near-Volga monocline is presented – it was formed as a result of halmyrolysis of ash material in lake conditions. Glauconitization is confined to the Paleogene thermal maximum and the periphery of active volcanism along the entire mobile belt. In this connection, it is widely distributed in the Paleogene deposits. Structural and crystal-chemical features of glauconite, stages of crystallization of its aggregates, paragenetic associations with smectite, kaolinite, an

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Kudamanov, A. I., T. M. Karikh, S. E. Agalakov, and I. G. Pavlutkin. "Uneven transformation of sedimentary silica in Western Siberia (a case study of the Santonian gaizes of the Hayakha formation)." Oil and Gas Studies, no. 4 (September 5, 2024): 64–83. http://dx.doi.org/10.31660/0445-0108-2024-4-64-83.

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The Upper Cretaceous, potentially gas-bearing gaizes of the Hayakha formation (Santon) of the West Siberian Plate, which covers an area of approximately 2.5 million km², is characterized by a highly irregular degree of crystallization of silica aggregate (opal-cristobalite-tridimite or OCT-phase). This is an important parameter for assessing filtration-capacity properties. The gaize is present in 20-30 m thick strata and is distributed across an area of approximately 2.5 million km². The crystallization of the OCT-phase (ageing) in natural systems can be attributed to a number of factors. The

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35

Dallmeyer, R. David, and R. Damian Nance. "Tectonic implications of 40Ar/39Ar mineral ages from late Precambrian – Cambrian plutons, Avalon composite terrane, southern New Brunswick, Canada." Canadian Journal of Earth Sciences 29, no. 11 (1992): 2445–62. http://dx.doi.org/10.1139/e92-192.

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Within the Avalon composite terrane exposed in southern New Brunswick, late Precambrian, low-grade volcanic–sedimentary sequences are juxtaposed against late Precambrian gneisses (Brookville Gneiss) and older platformal metasedimentary rocks (Green Head Group) along the Caledonia Fault. Both assemblages host petrographically similar suites of calc-alkalic dioritic and granodioritic plutons. Those intruding volcanic–sedimentary sequences (Caledonia terrane) record ca. 615–625 Ma crystallization ages typical of arc-related magmatism throughout the Avalon composite terrane. However, 40Ar/39Ar age

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Mamedov, Vladimir, Natalia Boeva, Marina Makarova, Elena Shipilova, and Philimon Melnikov. "The Problem of the Formation of Boehmite and Gibbsite in Bauxite-Bearing Lateritic Profiles." Minerals 12, no. 3 (2022): 389. http://dx.doi.org/10.3390/min12030389.

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The study of a large amount of factual material about the formation conditions of gibbsite or boehmite and their mutual transformations in lateritic bauxites allowed us to solve the problem of boehmite formation and its spatial and genetic relationship to gibbsite. The boehmite formation occurred only during the formation of sedimentary-lateritic bauxites from alluvial and lacustrine sediments that underwent bleaching and resilification at the stage of sediment flooding, as well as on bleached bedrock under sedimentary-lateritic bauxites. The most intense boehmite formation occurred at a depth

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Ogasawara, Masatsugu, Mayuko Fukuyama, Rehanul Haq Siddiqui, and Ye Zhao. "Origin of the Ordovician Mansehra granite in the NW Himalaya, Pakistan: constraints from Sr–Nd isotopic data, zircon U–Pb age and Hf isotopes." Geological Society, London, Special Publications 481, no. 1 (2018): 277–98. http://dx.doi.org/10.1144/sp481.5.

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AbstractThe Mansehra granite in the NW Himalaya is a typical Lesser Himalayan granite. We present here new whole-rock geochemistry, Rb–Sr and Sm–Nd isotope data, together with zircon U–Pb ages and Hf isotope data, for the Mansehra granite. Geochemical data for the granite show typical S-type characteristics. Zircon U–Pb dating yields 206Pb/238U crystallization ages of 483–476 Ma. The zircon grains contain abundant inherited cores and some of these show a clear detrital origin. The 206Pb/238U ages of the inherited cores in the granite cluster in the ranges 889–664, 1862–1595 and 2029 Ma. An age

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Новоселов, К. А., Е. В. Белогуб, И. А. Блинов, and Д. А. Артемьев. "Detrital chrome spinels of the udokan sedimentary basin in transbaikalia." Геология и геофизика 65, no. 5 (2024): 694–709. http://dx.doi.org/10.15372/gig2023173.

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Удоканский осадочный бассейн является уникальной геологической структурой, вмещающей множество месторождений и проявлений медистых песчаников. Детритовый хромшпинелид присутствует в метапесчаниках сакуканской свиты на Удоканском и Ункурском месторождениях, которые тяготеют к прослоям «естественного шлиха». Минерал образует реликтовые включения в кристаллах магнетита. Состав его отличается высокими концентрациями цинка (до 11.62 мас. % ZnO) и марганца (до 6.32 мас. % MnO) при практически полном отсутствии магния. По сравнению с ассоциирующим магнетитом, хромит существенно обогащен германием (до

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Nikiforov, Anatoly V., Elena O. Dubinina, Nikolay A. Polyakov, Amina M. Sugorakova, and Aylan K. Khertek. "Influence of Host Marble Rocks on the Formation of Intrusive Alkaline Rocks and Carbonatites of Sangilen (E. Siberia, Russia)." Minerals 11, no. 7 (2021): 666. http://dx.doi.org/10.3390/min11070666.

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The study of the O and C isotope composition of calcite from nepheline syenites, ijolites and carbonatites of the Chik intrusion and the intrusions of the Erzin–Tarbagatay group of Sangilen (Eastern Siberia, Russia) showed derivation from alkaline melts enriched with a carbonate component from the host marbleized sedimentary rocks. The calculations showed that about 40% of the initial mass of carbonates involved in the interaction with silicate melts have remained after decarbonation. During the assimilation of the carbonate, an oxygen isotope exchange took place between the residual carbonate

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Marantos, I., T. Markopoulos, and G. E. Christidis. "Zeolitic alteration in the Tertiary Feres volcano-sedimentary basin, Thrace, NE Greece." Mineralogical Magazine 71, no. 3 (2007): 327–45. http://dx.doi.org/10.1180/minmag.2007.071.3.327.

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AbstractThe Tertiary volcano-sedimentary sequence of the Feres basin (Thrace, NE Greece), includes lavas of andesitic–rhyolitic composition as well as volcaniclastic rocks, pyroclastic flows and pyroclastic fall deposits principally of dacitic–rhyodacitic composition. The pyroclastic flow deposits frequently show intense devitrification, vapour-phase crystallization and evidence of fumarolic activity, which involves deposition of scapolite in pore spaces. The Feres basin can be subdivided on the basis of mineral alteration assemblages: (1) the Pefka region; characterized by intense hydrotherma

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Tokarev, Yury, Grigory Yakovlev, Zarina Saidova, Valery Grakhov, Alexander Buryanov, and Ali Elsaed Mohamed Mohamed Elrefai. "A STUDY ON MECHANICAL PROPERTIES AND STRUCTURE OF ANHYDRITE BINDER MODIFIED BY ULTRA-DISPERSED SILTSTONE." Engineering Structures and Technologies 11, no. 3 (2020): 78–86. http://dx.doi.org/10.3846/est.2019.11950.

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This research is devoted to modification of physical and mechanical properties and structure of a binder based on natural anhydrite. A sedimentary rock siltstone was added into the composition as a mineral ultrafine additive. The presence of aluminosilicate minerals proves that finely ground siltstone can be used as a mineral additive in the composition of the anhydrite binder, accelerating crystallization of gypsum new formations and densifying the structure of gypsum stone. For the first time, the effectiveness of using sodium and ammonium phosphates as hardening activators of an anhydrite b

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Gómez-Vivo, David, Fernando Gervilla, Rubén Piña, Rebeca Hernández-Díaz, and Antonio Azor. "Gold in the Farallones Block of the Shale-Hosted, Clastic-Dominated Castellanos Zinc-Lead Deposit (Northwest Cuba)." Minerals 11, no. 4 (2021): 414. http://dx.doi.org/10.3390/min11040414.

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The Zn-Pb ores of the Castellanos shale-hosted, clastic-dominated deposit in northwest Cuba average nearly 1 g/t Au, with local maximum concentrations up to 34 g/t Au. This deposit is stratiform with respect to the bedding in the host black shales and shows a bottom to top zoning of ore assemblages made up of a stockwork underlying the main orebody, a basal pyrite-rich zone and a disseminated to massive Zn-Pb ore zone capped by a discontinuous, thin barite-rich zone. Petrographic data and textural relations allow distinguishing five textural types of pyrite (framboidal Py I, colloform Py IIa,

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Popok, Vladimir N., Nickolay I. Popok, Nickolay V. Bychin, and Svetlana N. Aponyakina. "Crystallization and co-crystallization of CL-20. Influence of some process conditions on product properties." Butlerov Communications 59, no. 9 (2019): 1–17. http://dx.doi.org/10.37952/roi-jbc-01/19-59-9-1.

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Crystallization of CL-20 (HNIW) with all the variety of methods faces a number of problems caused by heterogeneous nucleation, polymorphic transformations of the product in the process of crystallization, stability most polymorphic modifications of HNIW under normal conditions, difficulty reproducing granulometric composition and polymorphic purity of the product in laboratory, pilot and industrial facilities. Analysis of literary data shows that important but little researched factors that determine the properties of crystalline product obtained by different methods are: the properties of the

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Caplan, M. E., and I. F. Freeman. "Precise diffusion coefficients for white dwarf astrophysics." Monthly Notices of the Royal Astronomical Society 505, no. 1 (2021): 45–49. http://dx.doi.org/10.1093/mnras/stab1259.

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ABSTRACT Observations of Galactic white dwarfs with Gaia have allowed for unprecedented modelling of white dwarf cooling, resolving core crystallization, and sedimentary heating from neutron-rich nuclei. These cooling sequences are sensitive to the diffusion coefficients of nuclei in Coulomb plasmas which have order 10 per cent uncertainty and are often not valid across coupling regimes. Using large-scale molecular dynamics simulations we calculate diffusion coefficients at high resolution in the regime relevant for white dwarf modelling. We present a physically motivated law for diffusion wit

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Afzal, Shahzad, Mohammad Younas, and Karamat Ali. "Temporal Variability of the Water Quality of Saline Lakes from the Soan-Sakesar Valley, Salt Range, Pakistan." Water Quality Research Journal 33, no. 2 (1998): 331–46. http://dx.doi.org/10.2166/wqrj.1998.018.

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Abstract Saline lakes from the Soan-Sakesar valley are a breeding and feeding habitat for many shorebirds and waterfowl. In 1994, water samples were collected from lakes Uchhali, Khabbaki and Jahlar and analyzed for a variety of parameters such as Secchi disk transparency, chlorophyll a, total phosphorus, nitrate, alkalinity, pH, total dissolved substances, calcium, magnesium, sodium, potassium, chloride and sulfate. Chemical changes observed in 1994 were compared to those of 1986. The three lakes studied can be characterized as hypereutrophic. Their chemistry is controlled mainly by an evapor

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46

Islam, R., K. S. Bist, B. K. Chaudhuri, B. S. Rawat, and K. K. Purohit. "Geochemistry and Petrogenesis of Hanuman Tibba Granite of Kullu Valley, Himachal Himalaya." Journal Geological Society of India 49, no. 1 (1997): 13–21. http://dx.doi.org/10.17491/jgsi/1997/490102.

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Abstract A maiden attempt has been made to study the far-flung Hanuman Tibba Granites of Kullu valley, Himachal Pradesh. The granite has intruded the low grade Haimanta (-Lahaul) Formation which tectonically overlies the Rohtang Gneissic Complex. Integrated field, petrographic and geochemical studies have revealed that it is peraluminous S- type granite derived from sedimentary protolith. Compositional difference in terms of depletion of Fe, Mg, Ti, Ca, Sr, Zr and enhancement of Sit K and Rb from margin to core of the granite body is consistent with fractional crystallization process. The empl

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Trubelja, Fabijan, Klaus Peter Burgath, and Vesna Marchig. "Triassic Magmatism in the Area of the Central Dinarides (Bosnia and Herzegovina): Geochemical Resolving of Tectonic Setting." Geologia Croatica 57, no. 2 (2004): 159–70. http://dx.doi.org/10.4154/gc.2004.13.

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Triassic magmatic rocks in the Central Dinarides in Bosnia and Herze-govina are known from two separate geotectonic units: (1) the AdriaticCarbonate Platform (Outer Dinarides) and (2) the Palaeozoic–Triassicallochthonous complex. They are assigned to the same regional, genetic and geochemical unit. Their emplacement age is inferred from contacts with the surrounding marble and sedimentary rocks (post-Anisian for intrusives and Ladinian for effusives).The magmatic rocks display different levels of emplacement and crystallization (intrusive, effusive and dyke rocks). They represent different sta

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Kvasnytsya, V. M. "DIAMONDS OF UKRAINE: RESULTS AND GOALS." Mineralogical Journal 43, no. 3 (2021): 25–41. http://dx.doi.org/10.15407/mineraljournal.43.03.025.

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Diamonds from Ukraine were studied in terms of their separation into their geological and genetic types, distribution and occurrence, the ages of their host rocks, and their nature in Proterozoic and Neogene age sediments. The diamonds are variable in morphology, internal structure, concentration and degree of aggregation of nitrogen centers, carbon isotopes and mineral inclusions. Placer diamonds, primarily from Neogene sands, are anomalous in many respects. They are mostly extremely small, polyhedral, and morphologically diverse showing octahedral, rhombic dodecahedral and cubic forms and th

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Georgiev, Stoyan, Elitsa Stefanova, Atanas Hikov, Irena Peytcheva, Valeri Sachanski, and Milen Stavrev. "Carboniferous sills and related metasomatic activity in the area of Asaritsa Peak, West Stara Planina Mountain." Review of the Bulgarian Geological Society 84, no. 3 (2023): 85–88. http://dx.doi.org/10.52215/rev.bgs.2023.84.3.85.

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Two diorite to monzodiorite sills are recently found among the Silurian sedimentary succession near to Asaritsa peak, West Stara Planina Mountain. Several levels with diagenetic metalliferous nodules occur within shale interval in the sediments. The magmatic rocks are affected by strong propylitic to sericitic alteration (chlorite, sericite, albite and quartz) and only relicts of the rock-forming minerals (feldspar, biotite and clinopyroxene) are observed. The bodies are crosscut by thin quartz veins and disseminated pyrite is observed. The chondrite normalized spidergrams show patterns simila

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TROLL, VALENTIN R., JANE P. CHADWICK, ROBERT M. ELLAM, SUSAN Mc DONNELL, C. HENRY EMELEUS, and IAN G. MEIGHAN. "Sr and Nd isotope evidence for successive crustal contamination of Slieve Gullion ring-dyke magmas, Co. Armagh, Ireland." Geological Magazine 142, no. 6 (2005): 659–68. http://dx.doi.org/10.1017/s0016756805001068.

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The Palaeogene Slieve Gullion Igneous Centre in southern Armagh, Northern Ireland, consists of a layered central intrusive complex surrounded by a prominent and slightly older ring-dyke that intrudes both Lower Palaeozoic sedimentary rocks and the Caledonian Newry Granodiorite pluton (452 Ma). The ring-dyke comprises two major rock types: porphyritic felsite and porphyritic granophyre. We analysed both ring-dyke lithologies, both types of country rock, and a local Palaeogene basalt dyke sample for Sr and Nd isotopes. Trace element and whole rock data for this suite suggest that there are two d

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