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Artículos de revistas sobre el tema "Trace elements zoning"

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Publicado: 25 de mayo de 2024

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1

Levashova, Ekaterina V., Sergey G. Skublov, and Vladimir A. Popov. "Distribution of Trace Elements Controlled by Sector and Growth Zonings in Zircon from Feldspathic Pegmatites (Ilmen Mountains, the Southern Urals)." Geosciences 11, no. 1 (2020): 7. http://dx.doi.org/10.3390/geosciences11010007.

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The present study contains the detailed ion microprobe data on trace and rare earth elements distribution in the large zircon crystal about 10 × 6 mm in size with distinct growth and sector zonings from Ilmen Mountains feldspathic pegmatite. The zircon crystal morphology is a combination of a prism {110} and a dipyramid {111}. It is found out that the growth sector of the prism {110} generally contains higher concentrations of Th, U, REE, Y, and Nb and exhibits a more gently sloping HREE distribution pattern and a steeper LREE distribution pattern, in contrast to zircon from the growth sector
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2

Jourdan, A. L., T. W. Vennemann, J. Mullis, and K. Ramseyer. "Sector zoning of trace elements and oxygen isotopes in natural quartz crystals." Geochimica et Cosmochimica Acta 70, no. 18 (2006): A298. http://dx.doi.org/10.1016/j.gca.2006.06.605.

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3

Shumyhai, I., V. Konishchuk, V. Martynenko, and P. Dushko. "Agro-ecological processes under conditions of biogeochemical imbalance of molybdenum in agrolandscapes of the Forest-Step zone." Balanced nature using, no. 4 (October 25, 2023): 80–90. http://dx.doi.org/10.33730/2310-4678.4.2023.292730.

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A special place in the theory and practice of landscape geochemistry belongs to biogeochemical zoning. Biogenic migration of substances and chemical elements can rightfully be considered one of the criteria for the typological classification of geochemical landscapes, which is the basis for building a map of geochemical landscapes of Ukraine. The scientific result of zoning is the recognition of spatial boundaries and areas of the territory consisting of connected components with uniform conditions of geochemical migration of chemical elements. With a long-term violation of the ratio between m
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4

Wang, Guoqiang, Xiangmin Li, Dongliang Zhang, Jiyuan Yu, and Yujie Liu. "Genesis of the Yingzuihongshan Tungsten Deposit, Western Inner Mongolia Autonomous Region, North China: Constraints from In Situ Trace Elements Analyses of Scheelite." Minerals 11, no. 5 (2021): 510. http://dx.doi.org/10.3390/min11050510.

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In situ analyses of trace elements and rare-earth elements (REEs) were performed by use of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) on scheelite samples from the Yingzuihongshan tungsten deposit in western Inner Mongolia Autonomous Region, China. The contents of trace elements Nb, Ta and Mo of scheelite indicate that the ore-forming fluid is magmatic hydrotherm and is exsolved from highly fractionated granitic melt. The scheelite has high REE contents and ∑REE values, and a very inhomogeneous distribution of REEs exists in different scheelite grains or even in on
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5

Azadbakht, Zeinab, and David R. Lentz. "High-resolution LA-ICP-MS trace-element mapping of magmatic biotite: A new approach for studying syn- to post-magmatic evolution." Canadian Mineralogist 58, no. 3 (2020): 293–311. http://dx.doi.org/10.3749/canmin.1900101.

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ABSTRACT Biotite grains from 22 felsic intrusions in New Brunswick were mapped in situ using a laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS). We investigated the extent to which biotite can retain its magmatic zoning patterns and, where zoning does exist, how it can be used to elucidate early to late stage, syn-magmatic to post-crystallization processes. Although the major element and halogen contents of the examined biotite phenocrysts are homogeneous, two-thirds of the grains display trace-element zoning for Ba, Rb, and Cs. The results also indicated that zoning is
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6

McCurdy, Karr, Norman Russell, and Stephen E. Kesler. "Primary Dispersion of Trace Elements, Fluid Inclusion Zoning, and Alteration Zoning at the Pueblo Viejo Au-Ag Deposit, Dominican Republic." Journal of Geochemical Exploration 25, no. 1-2 (1986): 259–60. http://dx.doi.org/10.1016/0375-6742(86)90060-9.

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7

Hossain, Mobarok, and Pulak Kumar Patra. "Contamination zoning and health risk assessment of trace elements in groundwater through geostatistical modelling." Ecotoxicology and Environmental Safety 189 (February 2020): 110038. http://dx.doi.org/10.1016/j.ecoenv.2019.110038.

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8

Azarenko, Yu A. "Trace elements in the system “soil-plants” and optimization of their use in agrocenoses of the Omsk Irtysh Land." Kormlenie sel'skohozjajstvennyh zhivotnyh i kormoproizvodstvo (Feeding of agricultural animals and feed production), no. 2 (February 1, 2021): 42–61. http://dx.doi.org/10.33920/sel-05-2102-05.

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The data on the content and reserves of trace elements (Mn, Cu, Zn, Co, Mo, B) in soils, reveals patterns of their distribution and quantitative characteristics of relationships in the “soil-plants” system in agrocenoses of the Omsk Irtysh Land have been systematized in the article. The assessment of trace elements in soils and plants has been carried out from the ecological and agrochemical positions. The peculiarities of the intake and accumulation of trace elements in plants depending on zonal soil and climatic conditions have been revealed. Indicators for evaluating the potential of trace
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9

Viana, Rúbia R., Hanna J. Evangelista, and Willem B. Stern. "Chemical zoning of muscovite megacrystal from the Brazilian Pegmatite Province." Anais da Academia Brasileira de Ciências 79, no. 3 (2007): 431–39. http://dx.doi.org/10.1590/s0001-37652007000300007.

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Macroscopically homogenous muscovite plate from the Cruzeiro pegmatite, located in the Eastern Pegmatite Province in Minas Gerais, may show complex distribution patterns of some trace elements. In geochronological and petrological studies, as for example in the distinction of magmatic and post-magmatic mica, the cause of zoning could be taken into consideration. The complex chemical zoning in the studied mica plate can be best explained by growth in an evolving magma followed by alteration due to percolation of hydrothermal fluids. Enrichment of Rb towards the border is interpreted as resultin
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10

MacRae, Colin M., Nicholas C. Wilson, and Joel Brugger. "Quantitative Cathodoluminescence Mapping with Application to a Kalgoorlie Scheelite." Microscopy and Microanalysis 15, no. 3 (2009): 222–30. http://dx.doi.org/10.1017/s1431927609090308.

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AbstractA method for the analysis of cathodoluminescence spectra is described that enables quantitative trace-element-level distributions to be mapped within minerals and materials. Cathodoluminescence intensities for a number of rare earth elements are determined by Gaussian peak fitting, and these intensities show positive correlation with independently measured concentrations down to parts per million levels. The ability to quantify cathodoluminescence spectra provides a powerful tool to determine both trace element abundances and charge state, while major elemental levels can be determined
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11

Paterson, Bruce A., and W. Edryd Stephens. "Kinetically induced compositional zoning in titanite: implications for accessory-phase/melt partitioning of trace elements." Contributions to Mineralogy and Petrology 109, no. 3 (1992): 373–85. http://dx.doi.org/10.1007/bf00283325.

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12

Belousova, E. A., W. L. Griffin, and N. J. Pearson. "Trace element composition and cathodoluminescence properties of southern African kimberlitic zircons." Mineralogical Magazine 62, no. 3 (1998): 355–66. http://dx.doi.org/10.1180/002646198547747.

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AbstractZircon frequently occurs as a minor mineral in kimberlites, and is recognised as a member of a suite of mantle-derived megacryst minerals. Cathodoluminescence (CL) microscopy and laser ablation ICPMS analysis were used to study the internal structure and chemical composition of zircon crystals from southern African kimberlites. Zoning revealed by CL ranges from fine oscillatory to broad homogeneous cores and overgrowths. The ICPMS data show that kimberlite zircons have distinctive trace element contents, with well defined ranges for REE, Y, U, Th, P and some other trace elements. Both
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13

Wang, Yifeng, and Enrique Merino. "Dynamic model of oscillatory zoning of trace elements in calcite: Double layer, inhibition, and self-organization." Geochimica et Cosmochimica Acta 56, no. 2 (1992): 587–96. http://dx.doi.org/10.1016/0016-7037(92)90083-u.

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14

Sheikh, Lawangin, Wasiq Lutfi, Zhidan Zhao, and Muhammad Awais. "Geochronology, trace elements and Hf isotopic geochemistry of zircons from Swat orthogneisses, Northern Pakistan." Open Geosciences 12, no. 1 (2020): 148–62. http://dx.doi.org/10.1515/geo-2020-0109.

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AbstractIn this study, zircon grains are applied for U–Pb dating, Hf isotopes and trace elements to reveal the origin of magmatism and tectonic evolution of Late Paleozoic rocks of the Indian plate, Northern Pakistan. Most of the zircons are characterized by oscillatory zoning, depletion of light rare earth elements (LREE) and enrichment of heavy rare earth elements (HREE) with Ce and Eu anomalies. The yielded ages for these rocks are 256 ± 1.9 Ma and are plotted in the zones defined for the continental setting with few deviated toward the mid-oceanic ridge and the oceanic arc setting. Deviate
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15

Wei, Chen, Lin Ye, Zhilong Huang, Yusi Hu, and Haoyu Wang. "In situ trace elements and S isotope systematics for growth zoning in sphalerite from MVT deposits: A case study of Nayongzhi, South China." Mineralogical Magazine 85, no. 3 (2021): 364–78. http://dx.doi.org/10.1180/mgm.2021.29.

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AbstractZoning texture in sphalerite has been described in many studies, although its genesis and ore formation process are poorly constrained. In this investigation, we compare the in situ trace element and isotopic composition of colour-zoned sphalerites from Nayongzhi, South China, to explain the zoning growth process. Petrographic observations identified two broad types of zoned sphalerite, core–rim (CR) and core–mantle–rim (CMR) textures. Each zoned sphalerite displays two or three colour zones, including brown core, light colour bands and/or pale-yellow zones. In situ laser ablation indu
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16

Shah, Sajjad Ahmad, Yongjun Shao, Yu Zhang, Hongtao Zhao, and Lianjie Zhao. "Texture and Trace Element Geochemistry of Quartz: A Review." Minerals 12, no. 8 (2022): 1042. http://dx.doi.org/10.3390/min12081042.

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Quartz is one of the most abundant minerals. Used in a variety of materials, it preserves geological history and reflects alteration conditions. Data were collected (>2400 data points) from more than 40 ore deposits to understand its internal texture and geochemistry. Cathodoluminescence imaging is a technique for examining the internal texture of quartz that may reveal information about the crystal’s origin and evolution. The dominant trace elements in quartz lattice are Al, P, Li, Ti, Ge, K, and Na. These, combined with internal texture, can distinguish quartz from different origins and c
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17

Abdel Gawad, Ahmed E., Antoaneta Ene, Sergey G. Skublov, et al. "Trace Element Geochemistry and Genesis of Beryl from Wadi Nugrus, South Eastern Desert, Egypt." Minerals 12, no. 2 (2022): 206. http://dx.doi.org/10.3390/min12020206.

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Beryl occurs in the ancient Roman mines at Wadi Nugrus, South Eastern Desert of Egypt. It ranges from small crystals to 10 mm in size, and it varies in color, appearing as bright green, pale green, dark green and brown-green with biotite inclusions. The trace and minor elements were analyzed by the SIMS method. The two rims are richer in Cs, Na, Mg, Fe, Sc, V, Rb and H2O than cores but are poor in Mn, Ca, Co, Sr and Li. The bright-green rim is richer than the pale-green one in Na, P, K, Ca, Fe, Rb, Cs and F, but poorer in Mg and Li. The alkaline elements (Cs, Na, Rb) and Fe correlate with the
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18

Kristall, Brian, Diane Nielsen, Mark D. Hannington, Deborah S. Kelley, and John R. Delaney. "Chemical microenvironments within sulfide structures from the Mothra Hydrothermal Field: Evidence from high-resolution zoning of trace elements." Chemical Geology 290, no. 1-2 (2011): 12–30. http://dx.doi.org/10.1016/j.chemgeo.2011.08.008.

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19

Pring, Allan, Benjamin Wade, Aoife McFadden, Claire E. Lenehan, and Nigel J. Cook. "Coupled Substitutions of Minor and Trace Elements in Co-Existing Sphalerite and Wurtzite." Minerals 10, no. 2 (2020): 147. http://dx.doi.org/10.3390/min10020147.

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The nature of couple substitutions of minor and trace element chemistry of expitaxial intergrowths of wurtzite and sphalerite are reported. EPMA and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses display significant differences in the bulk chemistries of the two epitaxial intergrowth samples studied. The sample from the Animas-Chocaya Mine complex of Bolivia is Fe-rich with mean Fe levels of 4.8 wt% for wurztite-2H and 2.3 wt% for the sphalerite component, while the sample from Merelani Hills, Tanzania, is Mn-rich with mean Mn levels in wurztite-4H of 9.1 wt%
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20

Hernández-Filiberto, Lorena, Encarnación Roda-Robles, William B. Simmons, and Karen L. Webber. "Garnet as Indicator of Pegmatite Evolution: The Case Study of Pegmatites from the Oxford Pegmatite Field (Maine, USA)." Minerals 11, no. 8 (2021): 802. http://dx.doi.org/10.3390/min11080802.

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Almandine-spessartine garnets, from the Oxford County pegmatites and the Palermo No. 1 pegmatite, record significant compositional variations according to the degree of evolution of their hosting rock. Garnets from the most fractionated pegmatites (Mt. Mica, Berry-Havey, and Emmons) show the highest Mn, Nb, Ta, Zr, and Hf values, followed by those from the intermediate grade pegmatites (Palermo No. 1) and, finally, garnets from the barren pegmatites show the lowest values (Perham and Stop-35). Iron, Ca, and Mg contents follow an inverse order, with the highest contents in the latter pegmatites
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21

Kang, Zhi-Juan, Guang-Hai Shi, Wei-Yan Lei, et al. "Mineralogy and Geochemistry of JingFenCui (Rhodonite Jade) Deposit from Beijing, China." Crystals 12, no. 4 (2022): 483. http://dx.doi.org/10.3390/cryst12040483.

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JingFenCui is a type of rhodonite jade from the Changping district of Beijing, China, which is a manganese skarn deposit formed through the metasomatism of the granite aplite and Cambrian limestone. The pink color of JingFenCui is richer and brighter than that of rhodonite jade from other deposits. The surface of JingFenCui exhibits dendritic iron and manganese oxides, which is the outstanding advantage of rhodonite jade for carving works. The zoning pattern of mineralogy between the contact zone with the wallrock is obvious. The main skarn minerals consist mainly of spessartine, diopside, aug
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22

Brodbeck, Maurice, Teresa Ubide, Ilka Kleinhanns, Ronny Schoenberg, and Balz Kamber. "Quantitative Data Extraction from Orthopyroxene Trace Element Maps and Its Potential to Examine the Formation of the UG2 Unit, Bushveld Complex." Minerals 9, no. 2 (2019): 73. http://dx.doi.org/10.3390/min9020073.

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We present a mineral chemical stratigraphy across the UG2 Unit, situated in the Upper Critical Zone of the Bushveld Complex. The magmatic evolution of the rocks hosting this world-class ore deposit for chromium and platinum group elements (PGEs) is still under debate. Orthopyroxene is a common phase across the magmatic stratigraphy of the unit. It hosts trace metals, whose relative contents can record information about magmatic processes. This study determined laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) trace element data for orthopyroxene and spot LA multi-collecto
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23

King, Samuel Anthony, Nigel John Cook, Cristiana Liana Ciobanu, et al. "Coupled Microstructural EBSD and LA-ICP-MS Trace Element Mapping of Pyrite Constrains the Deformation History of Breccia-Hosted IOCG Ore Systems." Minerals 14, no. 2 (2024): 198. http://dx.doi.org/10.3390/min14020198.

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Electron backscatter diffraction (EBSD) methods are used to investigate the presence of microstructures in pyrite from the giant breccia-hosted Olympic Dam iron–oxide copper gold (IOCG) deposit, South Australia. Results include the first evidence for ductile deformation in pyrite from a brecciated deposit. Two stages of ductile behavior are observed, although extensive replacement and recrystallization driven by coupled dissolution–reprecipitation reaction have prevented widespread preservation of the earlier event. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) elemen
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24

Chen, Zhen-Yu, Li-Fei Zhang, Zeng Lü, and Jin-Xue Du. "Episodic Fluid Action in Chinese Southwestern Tianshan HP/UHP Metamorphic Belt: Evidence from U–Pb Dating of Zircon in Vein and Host Eclogite." Minerals 9, no. 12 (2019): 727. http://dx.doi.org/10.3390/min9120727.

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Fluid plays a key role in metamorphism and magmatism in subduction zones. Veins in high-pressure (HP) to ultrahigh-pressure (UHP) rocks are the products of fluid–rock interactions and can thus provide important constraints on fluid processes in subduction zones. In this study, we present an integrated study of zircon in situ U–Pb dating, trace element and mineral inclusion analysis for a complex vein and its host eclogite in the southwestern Tianshan UHP terrane, aiming to decipher the episodic fluid action during slab subduction and exhumation. Both zircon in eclogite and vein have euhedral,
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25

Sari, Y. K., A. D. Titisari, I. W. Warmada, and F. Hakim. "Petrogenesis of Botorubuh igneous rocks at Gunungkidul: A preliminary study for paleomagmatism phenomenon in the southern beach of Yogyakarta - Indonesia." IOP Conference Series: Earth and Environmental Science 851, no. 1 (2021): 012029. http://dx.doi.org/10.1088/1755-1315/851/1/012029.

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Abstract Botorubuh Beach is located at Southern Beach of Gunungkidul, in the Southern Mountain of Yogyakarta - Indonesia and is a promontory composed of Middle - Late Miocene igneous rock with a columnar jointing structure. This isolated igneous rock area is surrounded by limestone. Therefore, the regional geological map of Surakarta-Giritontro classifies this area as the Punung-Wonosari Formation which is dominated by limestone. Because of the geological phenomenon of the isolated igneous rock area, it is necessary to study the petrogenesis of the igneous rocks at the area. The petrogenesis r
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26

Zellmer, Georg F., Peter Dulski, and Yoshiyuki Iizuka. "Combined Major and Trace Element LA-ICP-MS Analysis of Compositional Variations in Simple Solid Solutions through Cross Correlation with an EPMA-Characterized Working Standard." Microscopy and Microanalysis 18, no. 4 (2012): 852–59. http://dx.doi.org/10.1017/s1431927612000463.

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AbstractDetermining correlated major and trace element zoning profiles is an important goal in modern microanalysis and is critical to some geospeedometric applications. We show that a precise determination of relative variations in major element compositions of simple solid solutions is possible by LA-ICPMS, and that low accuracy (analytical bias) can be corrected for through cross correlation with electron problem microanalyzer (EPMA)-characterized working standards. Further, the relative uncertainties on binary or quasibinary solid solution endmember proportions are always lower than the re
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27

Xia, Qiong-Xia, Peng Gao, Guang Yang, et al. "The Origin of Garnets in Anatectic Rocks from the Eastern Himalayan Syntaxis, Southeastern Tibet: Constraints from Major and Trace Element Zoning and Phase Equilibrium Relationships." Journal of Petrology 60, no. 11 (2019): 2241–80. http://dx.doi.org/10.1093/petrology/egaa009.

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Abstract Amphibolite- and granulite-facies metamorphic rocks are common in the eastern Himalayan syntaxis of southeastern Tibet. These rocks are composed mainly of gneiss, amphibolite and schist that underwent various degrees of migmatization to produce leucogranites, pegmatites and felsic veins. Zircon U–Pb dating of biotite gneiss, leucocratic vein and vein granite from the syntaxis yields consistent ages of ∼49 Ma, indicating crustal anatexis during continental collision between India and Asia. Garnets in these rocks are categorized into peritecitc and anatectic varieties based on their mod
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28

Sciuba, Marjorie, and Georges Beaudoin. "Texture and Trace Element Composition of Rutile in Orogenic Gold Deposits." Economic Geology 116, no. 8 (2021): 1865–92. http://dx.doi.org/10.5382/econgeo.4857.

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Abstract Rutile from a wide range of orogenic gold deposits and districts, including representative world-class deposits, was investigated for its texture and trace element composition using scanning electron microscopy, electron probe microanalysis, and laser ablation-inductively coupled plasma-mass spectrometry. Deposits are hosted in various country rocks including felsic to ultramafic igneous rocks and sedimentary rocks, which were metamorphosed from lower greenschist to middle amphibolite facies and with ages of mineralization that range from Archean to Phanerozoic. Rutile presents a wide
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29

Oeser, Martin, Ingo Horn, Ralf Dohmen, and Stefan Weyer. "Depth profile analyses by femtosecond laser ablation (multicollector) inductively coupled plasma mass spectrometry for resolving chemical and isotopic gradients in minerals." European Journal of Mineralogy 35, no. 5 (2023): 813–30. http://dx.doi.org/10.5194/ejm-35-813-2023.

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Abstract. Femtosecond laser ablation (fs-LA) coupled to a multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) instrument has been proven to be a powerful means to analyze isotope ratios of “non-traditional” stable isotope systems with high spatial resolution, precision, and accuracy. The technique has been successfully applied, e.g., to investigate diffusion-generated isotopic zoning of the elements Li, Mg, and Fe in magmatic crystals. Here, we present a novel sampling technique employing a fs-LA system that is equipped with a computer numerical control (CNC) laser stage, u
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30

Su, Qiangwei, Jingwen Mao, Jia Sun, Linghao Zhao, and Shengfa Xu. "Geochemistry and Origin of Scheelites from the Xiaoyao Tungsten Skarn Deposit in the Jiangnan Tungsten Belt, SE China." Minerals 10, no. 3 (2020): 271. http://dx.doi.org/10.3390/min10030271.

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The type, association, variations, and valence states of several metal elements of scheelite can trace the source and evolution of the ore-forming fluids. There are four types of scheelite from the Xiaoyao deposit: (1) scheelite intergrown with garnet in the proximal zone (Sch1a) and with pyroxene in the distal zone (Sch1b), (2) scheelite replaced Sch1a (Sch2a) and crystallized as rims around Sch1b (Sch2b), (3) quartz vein scheelite with oscillatory zoning (Sch3), and 4) scheelite (Sch4) within micro-fractures of Sch3. Substitutions involving Mo and Cd are of particular relevance, and both ele
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31

Andersen, Tom, and Marlina A. Elburg. "Open-system behaviour of detrital zircon during weathering: an example from the Palaeoproterozoic Pretoria Group, South Africa." Geological Magazine 159, no. 4 (2021): 561–76. http://dx.doi.org/10.1017/s001675682100114x.

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AbstractDetrital zircon in six surface samples of sandstone and contact metamorphic quartzite of the Magaliesberg and Rayton formations of the Pretoria Group (depositional age c. 2.20–2.06 Ga) show a major age fraction at 2.35–2.20 Ga, and minor early Palaeoproterozoic – Neoarchaean fractions. Trace-element concentrations vary widely, with Ti, Y and light rare earth elements (LREEs) spanning over three orders of magnitude. REE distribution patterns range from typical zircon patterns (LREE depletion, heavy REE enrichment, well-developed positive Ce and negative Eu anomalies) to patterns that ar
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32

Zhang, Yu, Pete Hollings, Yongjun Shao, Dengfeng Li, Huayong Chen, and Hongbin Li. "Magnetite texture and trace-element geochemistry fingerprint of pulsed mineralization in the Xinqiao Cu-Fe-Au deposit, Eastern China." American Mineralogist 105, no. 11 (2020): 1712–23. http://dx.doi.org/10.2138/am-2020-7414.

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Abstract The origin of stratabound deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt (MLYRB), Eastern China, is the subject of considerable debate. The Xinqiao Cu-Fe-Au deposit in the Tongling ore district is a typical stratabound ore body characterized by multi-stage magnetite. A total of six generations of magnetite have been identified. Mt1 is commonly replaced by porous Mt2, and both are commonly trapped in the core of Mt3, which is characterized by both core-rim textures and oscillatory zoning. Porous Mt4 commonly truncates the oscillatory zoning of Mt3, and Mt5 is chara
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33

Hazarika, Pranjit, Biswajit Mishra, and Kamal Lochan Pruseth. "Trace-element geochemistry of pyrite and arsenopyrite: ore genetic implications for late Archean orogenic gold deposits in southern India." Mineralogical Magazine 81, no. 3 (2017): 661–78. http://dx.doi.org/10.1180/minmag.2016.080.128.

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AbstractThe distribution of Au and associated trace elements in pyrite and arsenopyrite from late Archean Hutti and Hira-Buddini orogenic gold deposits, eastern Dharwar Craton, southern India was investigated by laser ablation-inductively coupled plasma-mass spectrometry. X-ray element maps acquired by electron probe microanalyser reveal oscillatory zoning of Co and As indicating the crystallization of pyrite and arsenopyrite in an episodic fluid flow regime in which fluid salinity fluctuated due to fault-valve actions. The absence of any relationship between Au and As in pyrite obviate the ro
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34

Fedak, І. О., and Ya М. Koval. "Lithofacial Zoning of Producing Horizons of Oil and Gas Fields Using Artificial Neural." Prospecting and Development of Oil and Gas Fields, no. 1(74) (March 31, 2020): 96–105. http://dx.doi.org/10.31471/1993-9973-2020-1(74)-96-105.

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The quality of an oil and gas field development project depends greatly on the accuracy of forecasting the processes that occur in the pore space of reservoirs during the extraction of hydrocarbons under certain technolo-gical conditions in production wells. The forecasting is possible if there is a geological model of the field. The more detailed the model is, the more accurate the prediction will be. The whole amount of information used to create a geological model of a field is of discrete nature, and its level of detail is determined by the number of wells that have discovered pay formatio
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35

Piccoli, Philip, Philip Candela, and Mark Rivers. "Interpreting magmatic processes from accessory phases: titanite—a small-scale recorder of large-scale processes." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 91, no. 1-2 (2000): 257–67. http://dx.doi.org/10.1017/s0263593300007422.

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In this study we examined variations in ore and other trace-metal concentrations in titanite, a ubiquitous product of magmatic (and subsequent sub-solidus) crystallisation in oxidised silicic magmas. Accessory titanite occurs in the Tuolumne Intrusive Suite (TIS), Sierra Nevada Batholith, as euhedral to anhedral, poikilitic, or interstitial grains. Zoned crystals of titanite were analysed by electron microprobe and synchrotron X-ray fluorescence for major and trace elements. Backscatter electron images reveal zoning, with bright areas correlating positively with total REE concentrations. REE c
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36

He, Xiaohu, Congfa Bao, Yongyan Lu, Nicole Leonard, Zheng Liu, and Shucheng Tan. "LA–ICP–MS U–Pb Dating, Elemental Mapping and In Situ Trace Element Analyses of Cassiterites from the Gejiu Tin Polymetallic Deposit, SW China: Constraints on the Timing of Mineralization and Precipitation Environment." Minerals 12, no. 3 (2022): 313. http://dx.doi.org/10.3390/min12030313.

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As a major constituent in magmatic–hydrothermal ore deposits, cassiterites, with moderate amounts of U and low Pb, can be dated with U–Pb geochronology. The tetragonal lattice structure makes cassiterites capable of incorporating dozens of elements within its crystal lattice (e.g., Fe, Ti, W, Zr, Hf, Ta, Nb, Mn, Sc, V, and Sb). Variations of these elements record information of potential elemental substitution mechanisms and precipitation environments of cassiterites. In this study, we collected cassiterite grains from four different ore styles of the Gejiu tin polymetallic deposit to perform
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37

Janoušek, Vojtěch, Tomáš Navrátil, Jakub Trubač, Ladislav Strnad, František Laufek, and Luděk Minařík. "Distribution of elements among minerals of a single (muscovite-) biotite granite sample – an optimal approach and general implications." Geologica Carpathica 65, no. 4 (2014): 257–72. http://dx.doi.org/10.2478/geoca-2014-0017.

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Abstract The petrography and mineral chemistry of the coarse-grained, weakly porphyritic (muscovite-) biotite Říčany granite (Variscan Central Bohemian Plutonic Complex, Bohemian Massif) were studied in order to assess the distribution of major and trace elements among its minerals, with consequences for granite petrogenesis and availability of geochemical species during supergene processes. It is demonstrated that chemistry-based approaches are the best suited for modal analyses of granites, especially methods taking into account compositions of whole-rock samples as well as their mineral con
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38

He, Lei, Ting Liang, Denghong Wang, et al. "Geochemical Characteristics of Garnet from Zinc–Copper Ore Bodies in the Changpo–Tongkeng Deposit and Its Geological Significance." Minerals 13, no. 7 (2023): 937. http://dx.doi.org/10.3390/min13070937.

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The Changpo–Tongkeng tin polymetallic deposit in Dachang, Guangxi, is a world-class, superlarge, polymetallic tin deposit consisting of lower skarn zinc–copper ore bodies and upper tin polymetallic ore bodies. Garnet is the main gangue mineral in the skarn zinc–copper ore bodies and has a granular texture. Based on hand specimens and microscopic observations, the existing garnet can be divided into two generations: an early generation (Grt I) and a late generation (Grt II). The results of electron probe microanalysis (EPMA) and laser ablation-inductively coupled plasma-mass spectrometry (LA-IC
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39

., Dac Xuan Ngo, Son Hai Trinh, Tin Duc Quach, et al. "In situ U-Pb isotopic dating method on titanite, and application to determine REE-Fe-Cu mineralization age of the Sin Quyen deposit, Lao Cai province." Journal of Mining and Earth Sciences 64, no. 6 (2023): 50–57. http://dx.doi.org/10.46326/jmes.2023.64(6).06.

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Titanite (CaTiSiO5) is an important common accessory mineral in hydrothermal deposits, with appreciable amounts of U and Th incorporated into their structures for age dating. Titanite crystals are usually larger than zircon and monazite and may have zoning in texture and geochemistry which represent different parageneses likely related to multiple hydrothermal or mineralization events. In line with the development of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) that has high sensitivity and spatial resolution, in-situ U-Pb isotopic dating method on titanite has becom
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40

Cherniak, D. J., and E. B. Watson. "Ti diffusion in feldspar." American Mineralogist 105, no. 7 (2020): 1040–51. http://dx.doi.org/10.2138/am-2020-7272.

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Abstract Chemical diffusion of Ti has been measured in natural K-feldspar and plagioclase. The sources of diffusant used were TiO2 powders or pre-annealed mixtures of TiO2 and Al2O3. Experiments were run in crimped Pt capsules in air or in sealed silica glass capsules with solid buffers (to buffer at NNO). Rutherford backscattering spectrometry (RBS) was used to measure Ti diffusion profiles. From these measurements, the following Arrhenius relations are obtained for diffusion normal to (001):For oligoclase, over the temperature range 750–1050 °C:DOlig=6.67×10-12exp(-207±31kJ/mol/RT)m2s-1For l
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41

Zheng, Beiqi, and Meihua Chen. "Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal." Crystals 11, no. 11 (2021): 1363. http://dx.doi.org/10.3390/cryst11111363.

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Few studies have focused on gem-quality tourmaline acting as a petrogenetic recorder, and the colour genesis of pink elbaite is still controversial. We carry out in situ major, trace element and boron isotope composition analyses on a single tourmaline crystal. This crystal is characterized by sudden transformation from colourless to pink, which can represent full pegmatite magma evolution. According to the analysis results, all spots are divided into alkali groups according to X-site occupancy and subdivided into elbaite series. The pink part accommodates higher concentrations of volatile and
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42

Ai Zamruddin, Nur Nadwa Syahirah, Nor Syazwani Zainal Abidin, Zakaria Endut, Charles Makoundi, Low Keng Lok, and Mohd Suhaili Ismail. "Trace Element Analysis of Pyrite and Arsenopyrite Using the LA-ICPMS Technique in Pulai, Central Belt of Peninsular Malaysia." Minerals 13, no. 8 (2023): 1026. http://dx.doi.org/10.3390/min13081026.

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The Pulai gold deposit is one of the most promising gold prospects in the Central Belt of Peninsular Malaysia. It is found within the Permian-Triassic Gua Musang sequence of metasediments and metavolcanics and in a structurally controlled NE-SW major fault. Various ore minerals, including pyrite, arsenopyrite, chalcopyrite, sphalerite, pyrrhotite, and galena are typically associated with this deposit. Four types of pyrite (Pyrite 1, Pyrite 2, Pyrite 3, and Pyrite 4) and two types of arsenopyrite (Arsenopyrite 1 and Arsenopyrite 2) were characterised based on their morphological and textural di
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43

Kadetov, Nikita G., and Angelina E. Gnedenko. "SITES WITH INCREASED PHYTODIVERSITY IN THE FIRE-BURNED PART OF THE KERZHENSKY NATURE RESERVE: SIGNIFICANCE, ORIGIN, MAPPING." Географический вестник = Geographical bulletin, no. 3(58) (2021): 142–52. http://dx.doi.org/10.17072/2079-7877-2021-3-142-152.

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The position of the Nizhny Novgorod Trans-Volga region in vegetation zoning schemes has long been a subject of discussion, which is due to the peculiarities of its landscape structure and long-term anthropogenic impact. This study examines the role of areas of increased phytodiversity in the post-fire part of the Kerzhensky Nature Reserve as an important component of the communities’ recovery after fires, an also deals with their spatial structure and floristic composition. A combination of field observations (geobotanical descriptions, soil profiles) and cartographic materials were used as th
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44

Henning, Sören, Torsten Graupner, Thomas Krassmann, et al. "Processes of Enrichment of Trace Metals for High-Tech Applications in Hydrothermal Veins of the Ruhr Basin and the Rhenish Massif, Germany." Canadian Mineralogist 60, no. 6 (2022): 881–912. http://dx.doi.org/10.3749/canmin.2100053.

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ABSTRACT The increasing demand for high-tech trace elements supports the need for systematic investigations of their primary occurrences. Mineralogy and trace element characteristics of hydrothermal base-metal veins from the Ruhr Basin (Ruhrgebiet) and the Rhenish Massif (Bergisches Land) in Germany were studied by energy-dispersive X-ray fluorescence mapping, laser ablation-ICP-mass spectrometry, and electron microprobe analyses. Quantitative trace element analysis proves elevated concentrations of Ge and Ga in sphalerite from the Ruhrgebiet. In addition to about 6 Mt of sphalerite-dominated
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45

Savonina, E. Yu, O. N. Katasonova, and T. A. Maryutina. "Extraction concentrating of the acid-soluble forms of rare earth elements from oils of the Volga-Ural oil and gas province using rotating coiled columns." Industrial laboratory. Diagnostics of materials 87, no. 12 (2021): 5–10. http://dx.doi.org/10.26896/1028-6861-2021-87-12-5-10.

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Trace elements in oils are the natural markers of the oil origin of and the mechanism of oil genesis. Direct determination of rare earth elements (REE) in crude oils is rather difficult due to their low concentrations (10–6 wt. %). Information about the forms of trace elements in oils is of particular interest. The goal of the study is determination of the content of acid-soluble forms of REE in oils from various fields of the Volga-Ural oil and gas province. Six samples of oils of heavy and medium density and viscosity were analyzed. Extraction of acid-soluble forms of REE was carried out usi
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46

Li, Wurui, Bo Xu, Zhuang Miao, Zheyi Zhao, and Hangyu Liu. "Exploring the CAM18 Crystal as a Potential Reference Material for U–Pb Analysis of Zircon." Crystals 13, no. 9 (2023): 1364. http://dx.doi.org/10.3390/cryst13091364.

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In the process of in situ zircon U–Pb dating, it is an effective means to overcome the matrix effect by using a matrix-matched external reference material. However, the limited number of available zircon reference materials still makes it difficult to meet the research needs. In this paper, we performed a preliminary analysis of the gemological characteristics, trace elements and U–Pb ages of natural zircon CAM18 to assess its suitability as a reference material for laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb dating. This tawny, gem-quality zircon has no visibl
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47

Sutherland, Frederick, Khin Zaw, Sebastien Meffre, et al. "Diversity in Ruby Geochemistry and Its Inclusions: Intra- and Inter- Continental Comparisons from Myanmar and Eastern Australia." Minerals 9, no. 1 (2019): 28. http://dx.doi.org/10.3390/min9010028.

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Ruby in diverse geological settings leaves petrogenetic clues, in its zoning, inclusions, trace elements and oxygen isotope values. Rock-hosted and isolated crystals are compared from Myanmar, SE Asia, and New South Wales, East Australia. Myanmar ruby typifies metasomatized and metamorphic settings, while East Australian ruby xenocrysts are derived from basalts that tapped underlying fold belts. The respective suites include homogeneous ruby; bi-colored inner (violet blue) and outer (red) zoned ruby; ruby-sapphirine-spinel composites; pink to red grains and multi-zoned crystals of red-pink-whi
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48

Nguyen, Niem Van, Dung Tien Nguyen, Duan Tran, et al. "Geochemical - geology characteristics implicating original sources and copper - deposit type in Kon Ra ore - field." Journal of Mining and Earth Sciences 62, no. 5 (2021): 12–28. http://dx.doi.org/10.46326/jmes.2021.62(5).02.

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Based on the research results on petrographic - mineralogical characteristics, tectonic structural features, geochemistry of major and trace elements of the bedrock, alternative rock, ore, soil, mineralogical geochemistry, mineral facies, inclusions, the origin of ore formation related to oxidized granite and skarnoid - typed metasomatic process in Kon Ra copper ore field have been identified. Petrological and mineral characteristics indicate the process of transitional metasomatism between the skarn and hornfels, also known as bimetasomatic stage (skarnoid deposit type). Diopxite represents t
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49

Di Muro, A., E. Bonaccorsi, and C. Principe. "Complex colour and chemical zoning of sodalite-group phases in a haüynophyre lava from Mt. Vulture, Italy." Mineralogical Magazine 68, no. 4 (2004): 591–614. http://dx.doi.org/10.1180/0026461046840206.

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AbstractThe haüynophyre emitted from a parasitic vent of the Vulture stratovolcano is a S- and Cl-rich, leucitemelilite- bearing lava flow containing an unusually large amount of sodalite-group minerals (>23 vol.%). Mineralogical and chemical study of phenocrysts has led to the identification of black haüynes, blue lazurites and of Cl-rich white or black noseans. X-ray diffraction (XRD) study confirms the occurrence of nosean having a low symmetry (P23). Raman spectra and XRD data show that S is fully oxidized to SO4 in black haüynes and in white noseans, while it is partly reduced to form
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50

Liu, Zhen-Jun, Li-Qiang Yang, Dong Xie, et al. "Hydrothermal Alteration Processes of Xincheng Gold Deposit Jiaodong Peninsula, China: Constraints from Composition of Hydrothermal Rutile." Minerals 14, no. 4 (2024): 417. http://dx.doi.org/10.3390/min14040417.

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Delineating the process of hydrothermal alteration is crucial for effectively enhancing exploration strategies and better understanding the gold mineralization process. Rutile, with its capacity to accommodate a wide range of trace elements including high-field-strength elements and base metals, serves as a reliable fluid tracer in ore systems. As one of the most significant gold ore concentrations globally, Jiaodong boasts a gold reserve exceeding 5500 t. The Xincheng gold deposit is a world-class high-grade mine, boasting a proven gold reserve exceeding 200 t, and stands as one of the larges
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