Characteristics of hydrothermal chlorite from the Niujuan Ag-Au-Pb-Zn deposit in the north margin of NCC and implications for exploration tools for ore deposits

Wang, Zhiqiang; Chen, Bin; Yan, Xiang; Li, Senwen

doi:10.1016/j.oregeorev.2018.08.003

Cited by 18 publications

(3 citation statements)

References 71 publications

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“…A total of 3,317 analyses were collected from 23 papers from a variety of different geologic environments (Alva Jimenez, 2011; Augustin et al, 2012; Chu et al, 2020; Cohen, 2011; Cooke et al, 2020; Debret et al, 2013; El Korh et al, 2009; Jöns et al, 2009; Lackschewitz et al, 2004; Lackschewitz, Singer, Botz, Garbe‐Schonberg, et al, 2000; Lackschewitz, Singer, Botz, Garbe‐Schönberg, & Stoffers, 2000; Pacey et al, 2020; Shao et al, 2015; Smith et al, 1996; Soltani Dehnavi et al, 2019; Spandler et al, 2014; Tetiker et al, 2015; Wang et al, 2018; Wilkinson et al, 2015, 2020; Xiao & Chen, 2020; Xiao, Chen, Hollings, et al, 2018; Xiao, Chen, Wang, et al, 2018). Two different chlorite filters were applied: one for LA‐ICPMS analyses (reported in ppm), and the other for data from EPMA (reported in weight oxide percent).…”

Section: Methodsmentioning

confidence: 99%

A data screening approach to confirming a target mineral is chlorite using EPMA and LA‐ICPMS data

Freij,

Gregory,

Liu

2023

Geoscience Data Journal

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Applying machine learning techniques to large datasets of in situ analyses has been proven to be a powerful tool in Earth Sciences. However, problems may arise when dealing with minerals such as chlorite, that exist as a solid solution rather than a single, stoichiometric ideal. It can be difficult to determine whether the variations in major element concentrations are due to compositional difference in the mineral of interest or due to sampling of the surrounding mineral phases in addition to the mineral of interest during the analyses. If the latter, interpretations of the results would be complicated, misled or even spurious. Here we present a method to identify chlorite based on the major and minor element content, from both LA‐ICPMS and EPMA data. Further we present a dataset of 3,317 analyses of chlorite and have shown that 7.4% of these analyses include significant quantities of non‐chlorite material.

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Section: Methodsmentioning

confidence: 99%

A data screening approach to confirming a target mineral is chlorite using EPMA and LA‐ICPMS data

Freij,

Gregory,

Liu

2023

Geoscience Data Journal

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“…3; 4D, F), which likely resulted from high-temperature alterations (e.g. Tillick et al, 2001;Wang et al, 2018). XRD analyses further revealed the presence of chlorite-smectite and micasmectite (Fig.…”

Section: Petrography and Mineral Chemistrymentioning

confidence: 96%

Middle Triassic high-K calc-alkaline effusive and pyroclastic rocks from the Zagorje-Mid-Transdanubian Zone (Mt. Kuna Gora; NW Croatia): mineralogy, petrology, geochemistry and tectonomagmatic affinity

Slovenec

Šegvić²

2021

GeA

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This study uses mineralogical, petrological, geochemical, and Sr and Nd isotope data along with K-Ar ages to infer the petrogenesis and geodynamic evolution of Middle Triassic high-K calc-alkaline lavas and their associated pyroclastics of Mt. Kuna Gora in NW Croatia. Their analogue mineralogy and bulk-rock geochemistry testify to the coeval origin of both rock types. Sanidine and plagioclase accompanied by inor augite and Ti-bearing magnetite are the major phases found in a matrix of devitrified volcanic glass and plagioclase microlites. Hydrothermal anddiagenetic processes in the pyroclastics originated the formation of chlorite and white mica, and mixed-layer clay minerals, respectively. Petrography reveals the following crystallization order: spinel→clinopyroxene→plagioclase→alkali-feldspar±Fe-Ti oxides. Geochemical and isotopic data suggests that the studied rocks had a complex origin that included the contamination of subduction-generated magmas by lithospheric mantle melts. This presumes an interplay between fertile arc mantle, subducted continental crust, and depleted or ocean island basalts-like mantle. A low degree of crustal contamination stands as a last step in the formation of such “hybrid” magmas. The subducted Paleotethyan oceanic lithosphere went through processes of partial melting at depths of ~45-49km and pressures of ≤1.6GPa and fractionation that produced melts which gave rise to the studied rocks. In the model we are proposing herein such formed partial melts are related to the demise of the northward subduction of the Paleotethys oceanic lithosphere during the Early to Middle Triassic epoch, which is consistent with an active, ensialic mature volcanic arc developing along Laurussian southern active margins.

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“…Moreover, current studies have shown that chemical compositions of biotite are also valuable indicators to constrain halogens fugacity and thus the physicochemical conditions of fluids in granitic magmatic-hydrothermal systems (Ayati et al, 2008;Siahcheshm et al, 2012;Teiber et al, 2015;Zhang et al, 2016;Jin et al, 2018). On the other hand, the precipitation of hydrothermal minerals like chlorite is common in granitic systems since chlorite formation is usually related to the alteration of primary ferromagnesian minerals, particularly biotite, and thus its occurrence provide useful information about temperatures of hydrothermal fluids altering the granitic bodies Zimak, 1999;Inoue et al, 2010;Ciesielczuk, 2012;Wang et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Main mafic and accessory mineralogy in granites and greisens from selected occurrences in the A-type Graciosa Province, S-SE Brazil, and petrological implications

Velandia¹

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Characteristics of hydrothermal chlorite from the Niujuan Ag-Au-Pb-Zn deposit in the north margin of NCC and implications for exploration tools for ore deposits

Cited by 18 publications

References 71 publications

A data screening approach to confirming a target mineral is chlorite using EPMA and LA‐ICPMS data

A data screening approach to confirming a target mineral is chlorite using EPMA and LA‐ICPMS data

Middle Triassic high-K calc-alkaline effusive and pyroclastic rocks from the Zagorje-Mid-Transdanubian Zone (Mt. Kuna Gora; NW Croatia): mineralogy, petrology, geochemistry and tectonomagmatic affinity

Main mafic and accessory mineralogy in granites and greisens from selected occurrences in the A-type Graciosa Province, S-SE Brazil, and petrological implications

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