Podrobnosti záznamu

    Extreme PGE concentrations in lower Cambrian acid tuff layer from the Kunyang phosphate deposit, Yunnan Province, South China - possible PGE source for lower Cambrian Mo-Ni-polyelement ore beds
    Frimmel, Hartwig
    Koubová, Magdaléna
    Luo, Taiyi
    Martínek, Karel
    Pašava, Jan
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Economic Geology
    Roč. 105, č. 6
Výraz tezauru
    acid tuff, PGE enrichment, Mo-Ni ore bed, Kunyang phosphate deposit, Yunnan province, China
Klíčové slovo
Abstrakt (anglicky)
   A study of the PGE distribution in various lowermost Cambrian rock types of the Kunyang phosphate deposit in South China revealed surprisingly the highest PGE concentrations (434 ppb Pt, 142 ppb Pd, 57.97ppb Rh, < 1 ppb Ru and 0,14 ppb Ir) in a whole rock sample of acid tuff. The clay-quartz fraction of the tuff revealed elevated Ru and Ir concentrations but a depletion in Pt, Pd and Rh relative to the whole rock. LA-ICPMS analyses of pyrite and yielded comparatively high Ni and in some grains also elevated Re and Pd concentrations. It is very likely that the PGE are in part bound to submicroscopic inclusions in pyrite and/or intermetallic phases bound to the clay fraction. Our observations are consisten with diagenetic metal enrichment. Similar anomalously PGE-enriched acid tuffs could have played an important role in the origin of the slightly younger Mo-Ni-PGE phosphatic and sulfidic black shales in the Yangtze Platform.
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
Datum importu
    15. 10. 2014