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Literatura académica sobre el tema "Trace elements zoning"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Trace elements zoning"

1

Levashova, Ekaterina V., Sergey G. Skublov y 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, n.º 1 (25 de diciembre de 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 of the dipyramid {111} development. Such a sector zoning pattern was formed at a late stage in crystal growth, when the prism {110} began to prevail over the dipyramid {111}. The zircon studied displays the growth zoning formed of alternating bands in back-scattered electron (BSE) image: wide dark and thin light bands. The last ones contain elevated Th, U, REE, Y, Nb, and Ti concentrations, Th/U ratio and Ce/Ce*. This growth zoning is most probably due to simultaneous crystallization of other minerals that concentrate trace elements, e.g., apatite and monazite, and the lack of equilibrium between zircon and fluid (melt).

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2

Jourdan, A. L., T. W. Vennemann, J. Mullis y K. Ramseyer. "Sector zoning of trace elements and oxygen isotopes in natural quartz crystals". Geochimica et Cosmochimica Acta 70, n.º 18 (agosto de 2006): A298. http://dx.doi.org/10.1016/j.gca.2006.06.605.

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3

Shumyhai, I., V. Konishchuk, V. Martynenko y P. Dushko. "Agro-ecological processes under conditions of biogeochemical imbalance of molybdenum in agrolandscapes of the Forest-Step zone". Balanced nature using, n.º 4 (25 de octubre de 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 microelements, various diseases appear, which are called endemic, and the phenomenon itself — biogeochemical endemics. The latter most often occur due to a lack or excess of some threshold value of the concentration of microelements or a violation of the ratio of other microelements associated with it. On the basis of landscape-geochemical analysis and zoning, the authors defined the territory of the biogeochemical provinces of the Forest Steppe, where a lack of molybdenum content in the soil for normal plant development was found. In addition, the features of the molybdenum province are determined by low biogenic accumulation and intensive physicochemical dispersion of essential trace elements, increased mobility of most toxic trace elements in natural waters, and the absence of conditions for the formation of barriers of hydroamphoteric elements, including Mo2+. Also, in the territories of biogeochemical provinces, there is a high probability of the development of certain endemic phytopathologies and microelement diseases due to the imbalance of biogeochemical food chains.

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4

Wang, Guoqiang, Xiangmin Li, Dongliang Zhang, Jiyuan Yu y 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, n.º 5 (11 de mayo de 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 one scheelite grain. The cathodoluminescence (CL) images of scheelite grains display well-developed zoning or fine oscillatory zoning. Development of zoning is closely related to the variable contents of REEs, and the darkness of shade of CL images are mainly determined by ∑REE values, but they have no correlation with the distribution patterns of REEs. The chondrite-normalized REE distribution patterns of scheelite are classified as the middle REEs (MREEs)-enriched type, except for a strong negative Eu-anomaly, which could be a REE-flat type and or a MREEs-depleted type. Trace element composition of scheelites from the Yinzuihongshan tungsten deposit reflect that the ore-forming materials mainly came from the crust and the ore-forming fluids are dominantly derived from the granitic magma in an oxidizing environment, in which very dynamic conditions of the hydrothermal system prevailed during precipitation of scheelite. On the basis of the above understanding and field geological featured, we considered that the Yingzuihongshan tungsten deposit is the quartz-vein-hosted tungsten type that is genetically associated with monzonitic granite.

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Azadbakht, Zeinab y 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, n.º 3 (1 de mayo de 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 better retained in larger grains (i.e., > 500 × 500 μm) with minimal alteration and mineral inclusions. An exceptionally well-zoned Li-rich siderophyllite from the Pleasant Ridge topaz granite in southwestern New Brunswick shows Ti, Ta, Sn, W, Cs, Rb, and V (without Li or Ba) zoning. Cesium values increase from 200 to 1400 ppm from core to rim. Conversely, Sn and W values decrease toward the rim (50 to 10 and 100 to 10 ppm, respectively). Tantalum and Ti values show fewer variations but drop abruptly close to the rim of the grain (100 to 20 and 2000 to 500 ppm, respectively). These observations may indicate crystallization of mineral phases with high partition coefficients for these highly incompatible elements (except Ti) (e.g., cassiterite and rutile) followed by fractionation of a fluid phase at a later stage of magma crystallization. The preservation of zoning may indicate rapid cooling post-crystallization of the parent magma.

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McCurdy, Karr, Norman Russell y 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, n.º 1-2 (marzo de 1986): 259–60. http://dx.doi.org/10.1016/0375-6742(86)90060-9.

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7

Hossain, Mobarok y Pulak Kumar Patra. "Contamination zoning and health risk assessment of trace elements in groundwater through geostatistical modelling". Ecotoxicology and Environmental Safety 189 (febrero de 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), n.º 2 (1 de febrero de 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 elements entering plants have been proposed, and its comparison for diff erent trace elements in the “soil-microfertilizerplant” system has been given. The use of this indicator in calculating and normalizing fertilizer doses and predicting the accumulation of trace elements in plants has been justified. The regularities of the distribution and shape of boron in diff erent types of soils of saline complexes have been studied. For the fi rst time a comprehensive assessment of the effect of high boron concentrations on crop productivity was carried out. A system of indicators for diagnosing the toxic eff ect of the element on plants and a scale of their borostability has been developed. The factors affecting the intake of boron in plants and their resistance to excess of the element have been revealed. Quantitative parameters of the eff ect of chemical reclamation on the boron content in the “soil-meliorant-plants” system have been obtained. The scheme of soil-geochemical zoning of the territory of the Omsk region reflecting the availability of trace elements in the soil has been developed. New data on the availability of trace elements in the main arable soils of the surveyed territory have been presented. The values of optimal levels of trace elements for agricultural crops were corrected. The economic and bioenergetic effi ciency of methods for optimizing plant nutrition with trace elements under the environments of agrocenoses of the Omsk Irtysh Land have been revealed.

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9

Viana, Rúbia R., Hanna J. Evangelista y Willem B. Stern. "Chemical zoning of muscovite megacrystal from the Brazilian Pegmatite Province". Anais da Academia Brasileira de Ciências 79, n.º 3 (septiembre de 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 resulting from the chemical evolution of the residual magma during crystal growth. The depletion in (IV Al+VI Al) as well as the increase in (Fe+Mg) and Si along a fracture could be due to the hydrothermal celadonitic substitution of muscovite. This alteration also caused depletion in the contents of Rb, Ga, Y, Nb, Sn, and Zn and residual concentration of Ti. Elements such as Ga, Y, Nb, Sn, and Zn, rarely considered in the discussion of differentiation or alteration processes in micas, have been shown to be as significant as the alkali-elements.

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10

MacRae, Colin M., Nicholas C. Wilson y Joel Brugger. "Quantitative Cathodoluminescence Mapping with Application to a Kalgoorlie Scheelite". Microscopy and Microanalysis 15, n.º 3 (22 de mayo de 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 using more traditional X-ray spectrometry. To illustrate the approach, a scheelite from Kalgoorlie, Western Australia, is hyperspectrally mapped and the cathodoluminescence is calibrated against microanalyses collected using a laser ablation inductively coupled plasma mass spectrometer. Trace element maps show micron scale zoning for the rare earth elements Sm3+, Dy3+, Er3+, and Eu3+/Eu2+. The distribution of Eu2+/Eu3+ suggests that both valences of Eu have been preserved in the scheelite since its crystallization 1.63 billion years ago.

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Más fuentes

Tesis sobre el tema "Trace elements zoning"

1

Yang, Panseok. "Trace element partitioning between coexisting metamorphic minerals and trace element zoning in metamorphic minerals from Gagnon Terrane, western Labrador /". Internet access available to MUN users only, 2002. http://collections.mun.ca/u?/theses,35173.

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2

Bosze, Stephanie Lynn. "SURFACE STRUCTURALLY CONTROLLED SECTORAL ZONING IN FLUORITE: IMPLICATIONS TO UNDERSTANDING HETEROGENEOUS REACTIVITY AT THE MINERAL-WATER INTERFACE". Oxford, Ohio : Miami University, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami981052842.

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3

Kobylinski, Christopher. "The Protracted Magmatism and Hydrothermal Activity Associated with the Gibraltar Porphyry Cu-Mo Deposit, South Central British Columbia, Canada". Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39484.

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The Gibraltar porphyry-Cu deposit is a large open pit porphyry Cu mine in Canada with the geological tonnage (production and reserves) of 3.2 Mt Cu. The Gibraltar deposit is hosted by the Granite Mountain Batholith (GMB), a tonalitic batholith with the surface exposure over 150 km2. All rocks within the batholith are tonalites with minor quartz diorites. The batholith intrudes into mafic volcanoclastic rocks of the Nicola group in the Quesnel terrane of the Canadian Cordillera. The Cu mineralization at Gibraltar is confined to a small 4.5 km2 area in the central part of the batholith and occurs primarily as disseminated chalcopyrite. New U-Pb dating on zircon shows protracted late Triassic magmatism spanning ~25 m.y. for the formation of the GMB. Early magmatism is dated at 229.2±4.4 Ma in unmineralized tonalites. Later, at least three magmatism form the Cu mineralization during a period spanning from 218.9±3.1 Ma to 205.8±2.1 Ma. These fertile magmas form in a more mature arc setting, superseded early barren magmatic activity in a more juvenile arc setting for the bulk of the GMB. Epidote in the GMB shows compositional zoning with Fe-poor cores and Fe-rich rims. The zoning in the mineralized intrusions likely reflects changes in hydrothermal fluid, from S-rich to S-poor. The data from the Gibraltar deposit shows that an economic porphyry Cu deposit may be found in igneous rocks with low Sr/Y in bulk rocks and low Eu/Eu* in zircon. In the Gibraltar deposit, Ce anomalies in zircon reflect oxidation conditions and are correlated with Cu resource associated with their respective intrusion.

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4

Hickmott, Donald Degarmo. "Trace element zoning in garnets--implications for metamorphic petrogenesis". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14743.

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Wright, Carrie. "SPECTROSCOPIC CHARACTERIZATION OF FLUORITE: RELATIONSHIPS BETWEEN TRACE ELEMENT ZONING, DEFECTS AND COLOR". Miami University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=miami1049298144.

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Wright, Carrie. "Spectroscopic characterization of fluorite relationships between trace element zoning, defects and color /". Oxford, Ohio : Miami University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1049298144.

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Thesis (M.S.)--Miami University, Dept. of Geology, 2002.
Title from first page of PDF document. Document formatted into pages; contains vi, 182 p. : ill. Includes bibliographical references (p. 128-130).

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7

Higashino, Fumiko. "Infiltration process of brine in the deep crust constrained from multi-scale major and trace element zonings in high-grade metamorphic rocks". 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215324.

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Hansen, James W. L. "The petrology, geochemistry and petrogenesis of the Goomboorian intrusive complex, southeast Queensland". Thesis, Queensland University of Technology, 1997.

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9

George, L. L. "Trace and minor elements in galena: a reconnaissance LA-ICP-MS study". Thesis, 2013. http://hdl.handle.net/2440/100088.

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This item is only available electronically.
Many minor/trace elements can substitute into the crystal lattice of galena at various concentrations. In-situ LA-ICP-MS analysis and trace element mapping are used to obtain minor/trace element data from a range of natural galena specimens aiming to enhance understanding of the governing factors that control minor/trace element partitioning. The coupled substitution Ag+ + (Bi, Sb)3+ ↔ 2Pb2+, is confirmed by data obtained, although when Bi and/or Sb are present at high concentrations (~> 0.002 mol.%), site vacancies most likely come into play through the additional substitution 2(Bi, Sb)3+ + □ ↔ 3Pb2+. Galena is the primary host of Tl in all mapped mineral assemblages. Thallium is likely incorporated into galena along with Cu through the coupled substitution: (Ag, Cu, Tl)+ + (Bi, Sb)3+ ↔ 2Pb2+. Tin can reach significant concentrations in galena, particularly when the latter formed via metamorphic recrystallisation. Tin is concentrated in galena, likely via the substitution: Sn4+ + □ ↔ 2Pb2+, involving the creation of lattice vacancies, or Sn2+ ↔ Pb2+. Tin and In concentrations show a strong positive correlation across the sample suite indicating that the availability of these elements is intimately linked in natural systems. Cadmium and minor Hg can be incorporated into galena; the simple isovalent substitution (Cd, Hg)2+ ↔ Pb2+ is inferred. Significant oscillatory compositional zoning, and lesser sector zoning of minor/trace elements (Ag, Sb, Bi, Se, Te) is confirmed, for the first time, in galena from two epithermal ores. Zoning is attributed to slow crystal growth into open spaces within the vein at relatively low temperatures. The datasets generated increase understanding of the nature and distribution of minor/trace elements in galena, and partitioning between galena and coexisting minerals. These data have several applications in the minerals industry, particularly in studies of mineral deposit genesis, ore processing and, potentially, also in mineral exploration.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Scences, 2013

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10

Kulhánek, Jan. "Látková bilance a zonální stavba hlavních a stopových prvků v atolovém granátu z metabazitu eklogitové facie". Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-388414.

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English abstract This work focuses on high pressure atoll garnet-bearing metabasites from the central part of Krušné hory Mts. in Saxothuringian zone of Bohemian Massif. Eclogite bodies are interpreted as a part of alochtonnous units, which were dragged into the high pressure conditions of subduction zone during a subduction of Saxothuringian oceanic crust under the Teplá-Barrandien Unit and subsequently they were exhumed into upper parts of subduction- collisional system. Main mineral assemblage of eclogites consists of omphacite, garnet, quartz and amphibole which replaces grains of omphacite. Minor minerals present are rutile, ilmenite, talc a chlorite. Zircon, apatite, paragonite, pyrite, plagioclase, albite and monazite are enclosed in porphyroblasts of garnets. Grains of garnet frequently form the atoll structures, where its central part of a grain is replaced by new minerals of matrix and rim part stays preserved. Based on compositional profiles and mapping of major and trace elements, two evolution phases of garnet were distinguished. Older garnet (I) forms mainly preserved cores of garnet and on the contrary younger garnet (II) is present on rims or also replaces garnet I in the core part of a grain. Garnet I has higher amounts of Ca and Mn but lower Mg and Fe than garnet II. Preserved grains of...

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Libros sobre el tema "Trace elements zoning"

1

Trace element zoning and incipient metamictization in a lunar zircon: Application of three microprobe techniques. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Capítulos de libros sobre el tema "Trace elements zoning"

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Churikova, Tatiana, Gerhard Wörner, John Eichelberger y Boris Ivanov. "Minor- and trace element zoning in plagioclase from Kizimen Volcano, Kamchatka: Insights on the magma chamber processes". En Volcanism and Subduction: The Kamchatka Region, 303–23. Washington, D. C.: American Geophysical Union, 2007. http://dx.doi.org/10.1029/172gm22.

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Actas de conferencias sobre el tema "Trace elements zoning"

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Stowell, Harold H., Elizabeth M. Bollen y Karen Odom Parker. "COMPOSITIONAL ZONING IN GARNET FROM POINT ANALYSES TO TRACE ELEMENT MAPS: A TRIBUTE TO ROBERT TRACY". En GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-335916.

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Aronoff, Ruth F., Christopher L. Andronicos y Jeffrey Vervoort. "TRACE ELEMENT ZONING IN GARNET AS A TOOL FOR TECTONIC INTERPRETATION". En GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287267.

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Rasor, Sarah, Gary Michelfelder y Cesar Bucheli-Olaya. "PLAGIOCLASE TRACE ELEMENT ZONING REVEALS CHANGES IN MAGMA STORAGE AT CERRO UTURUNCU". En Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-375721.

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Biela, Kimberley, Joshua S. Stone, Natalie Harmon, Jesse B. Walters, Alicia M. Cruz-Uribe y Horst Marschall. "TRACE ELEMENT ZONING IN TITANITE FROM SYROS, GREECE: IMPLICATIONS FOR COUPLED SUBSTITUTION MECHANISMS". En 54th Annual GSA Northeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019ne-328246.

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Chen, Mimi y Ian Campbell. "Kinetic factors control trace element and isotope zoning in Archean pyrite corona nodules". En Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.10364.

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Brennan, Clara, James Student y Mona-Liza C. Sirbescu. "INSIGHTS INTO SPODUMENE CRYSTALLIZATION AND GROWTH FROM TRACE ELEMENT CONCENTRATIONS AND INTRACRYSTALLINE ZONING". En GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-382423.

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Barnes, Calvin G., Ryan Berry, Nolwenn Coint, W. G. Ernst y M. A. Barnes. "TRACE ELEMENT ZONING IN HORNBLENDE: TRACKING AND MODELLING CRYSTALLIZATION OF CALC-ALKALINE ARC PLUTONS". En GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-281410.

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Sirbescu, Mona-Liza, Clara Brennan, Tina Hill, Jonathan Knapp y Nigel Kelly. "Growth mechanisms of giant crystals in pegmatites: Insights from intra-crystalline trace-element zoning". En Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.11134.

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Fulton, Anne, Elizabeth Holley y Patrick J. Sack. "WINDOWS INTO HYDROTHERMAL FLUID CHEMISTRY VIA NANOSCALE ANALYSES OF SULFIDE TRACE ELEMENT ZONING IN CARLIN GOLD DEPOSITS". En GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-353968.

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Bollen, Elizabeth M., Harold H. Stowell, Ruth F. Aronoff y Joshua J. Schwartz. "GARNET SM-ND AND LU-HF AGES FROM THE PICURIS OROGENY: UNDERSTANDING THEIR MEANING USING TRACE ELEMENT ZONING". En GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-335903.

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Informes sobre el tema "Trace elements zoning"

1

Plouffe, A., D. Petts, I M Kjarsgaard y M. Polivchuk. Laser ablation inductively coupled plasma mass spectrometry mapping of porphyry -related epidote from south-central British Columbia. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331671.

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The microscopic composition of thirteen samples of epidote related to porphyry Cu mineralization was mapped using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) at the Geological Survey of Canada. The objective of this research is to improve the indicator mineral method of mineral exploration in glaciated terrains by utilizing the trace element composition of epidote. Six bedrock samples from porphyry Cu deposits of south-central British Columbia (Gibraltar, Mount Polley and Woodjam), three bedrock samples from the Nicola Group located close (&lt;2 km) from the intrusions host of porphyry mineralization and afar (12 km), and four epidote grains from two till samples, one at Gibraltar and a second one at Mount Polley, were analyzed. Backscattered electron (BSE) images and the LA-ICP-MS maps show an heterogeneous distribution of Fe and Al in epidote following complex and mottled patterns and consistent zoning typically with high Fe and low Al concentrations in the core progressing to low Fe and high Al concentrations in the rim. Trace elements are heterogeneously distributed in epidote following the Fe/Al zoning in some samples. Evidence of late infiltration of trace elements (e.g. Cu, Zn, and REE) along fractures in epidote is observed in some samples. The variability in epidote composition is thought to be related to the changing conditions during its crystallization including oxidation state, pH, oxygen fugacity, fluid composition, temperature and pressure. Multiple LA-ICP-MS spot analyses need to be conducted on this mineral to fully evaluate its composition as an indicator mineral of porphyry Cu mineralization.

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