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Concentrations of platinum-group elements (PGE), Re and Au in arsenian pyrite and millerite from Mo-Ni-PGE-Au black shales (Zunyi region, Guizhou Province, China); results from LA-ICPMS study

Jan Pasava, Lukas Ackerman, Patricie Halodova, Ondrej Pour, Jana Durisova, Federica Zaccarini, Thomas Aiglsperger and Anna Vymazalova
Concentrations of platinum-group elements (PGE), Re and Au in arsenian pyrite and millerite from Mo-Ni-PGE-Au black shales (Zunyi region, Guizhou Province, China); results from LA-ICPMS study
European Journal of Mineralogy (June 2017) 29 (4): 623-633

Abstract

Lower Cambrian Mo-Ni sulphidic black shales from the Huangjiawan mine (Guizhou Province, south China) have anomalous platinum-group element (PGE) concentrations (up to approximately 1 ppm in total). We used LA-ICPMS to study the distribution of PGE in pyrite and Ni-sulphide (millerite) and FE-SEM/EDS for determination of As in pyrite. A sulphide concentrate was produced by innovative hydroseparation techniques from one representative sample, which contained 162 ppb Pt, 309 ppb Pd, 12.2 ppb Ru, 11.3 ppb Rh, 1.5 ppb Ir, 11 212 ppb Re and 343 ppb Au. Mineralogical analysis revealed that pyrite forms approximately 12 vol%, which corresponds to a calculated approximately 18.4 wt% of all mineral phases in mineralized black shale. We found that pyrite contains on average (144 analyses) 0.10 ppm Pt, 0.11 ppm Re and 1.40 ppm Au (Ru, Rh, Pd, Os and Ir were below detection limit). It also contains from approximately 0.5 to approximately 1.8 wt% As and can be therefore classified as arsenian pyrite. Millerite (77 analyses) showed PGE, Re and Au values below detection limit. We suggest that pyrite represents a dominant Au carrier, containing between 64 and 83% Au of the total Au mineralised rock budget. Conversely, pyrite does not bear any significant amount of Re and Pt, contributing up to approximately 0.2% and approximately 12.5% to their whole rock budgets, respectively. Time resolved LA-ICPMS spectra in pyrite indicate that Pt, Re and Au behave as typical lattice-bound elements, with only Re locally forming micro-inclusions. Arsenic is heterogeneously distributed in pyrite and the Au/As ratio (much lower than 0.02) is in support of Au to be structurally bound in solid solution.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 29
Serial Issue: 4
Title: Concentrations of platinum-group elements (PGE), Re and Au in arsenian pyrite and millerite from Mo-Ni-PGE-Au black shales (Zunyi region, Guizhou Province, China); results from LA-ICPMS study
Affiliation: Czech Geological Survey, Prague, Czech Republic
Pages: 623-633
Published: 20170608
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 74
Accession Number: 2017-082584
Categories: Mineralogy of non-silicatesGeochemistry of rocks, soils, and sedimentsEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, geol. sketch map
N27°40'03" - N27°40'03", E106°40'54" - E106°40'54"
Secondary Affiliation: Czech Academy of Sciences, Institute of Geology, CZE, Czech RepublicMontanuniversitaet Leoben, AUT, AustriaUniversity of Barcelona, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201743
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