Article disseminated gold–sulfide mineralization in metasomatites of the khangalas deposit, yana–kolyma metallogenic belt (Northeast russia): Analysis of the texture, geochemistry, and s isotopic composition of pyrite and arsenopyrite

Maxim V. Kudrin, Valery Yu Fridovsky, Lena I. Polufuntikova, Lyudmila Yu Kryuchkova

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    1 Scopus citations

    Abstract

    At the orogenic gold deposits of the Yana–Kolyma metallogenic belt (northeast Russia) both Au–quartz‐sulfide mineralization with native gold and disseminated sulfide mineralization with invisible Au developed. The textural and mineralogical‐geochemical features, isotope‐geo-chemical characteristics of gold‐bearing sulfides from proximal metasomatites, and possible forms of Au occurrence in pyrite and arsenopyrite have been studied using electron microprobe, atomic absorption, LA‐ICP‐MS trace element, isotope analysis, and computed microtomography. Four gen-erations of pyrite (Py1, diagenetic; Py2, metamorphic; Py3, metasomatic; Py4, veined) and two gen-erations of arsenopyrite (Apy1, metasomatic; Apy2, veined) have been identified at the Khangalas deposit. In the proximal metasomatites, the most common are Py3 and Apy1. Studying their chemical composition makes it possible to identify the features of the distribution patterns of typochem-ical trace elements in pyrite and arsenopyrite, and to establish the nature of the relationship between Au and these elements. In Py3 and Apy1, structurally bound (solid solution) Au+ prevails, isomor-phically entering the crystal lattice or its defects. Isotope characteristics of hydrothermal sulfides (δ34S = –2.0 to –0.6‰) indicate that mantle/magmatic sulfur was involved in the formation of the deposit, though the participation of sulfur from the host rocks of the Verkhoyansk clastic complex cannot be ruled out. The Khangalas deposit has much in common with other gold deposits of the Yana–Kolyma metallogenic belt, and from this point of view, the results obtained will help to better reveal their gold potential and understand their origin.

    Original languageEnglish
    Article number403
    Number of pages31
    JournalMinerals
    Volume11
    Issue number4
    DOIs
    StatePublished - 2021

    Scopus subject areas

    • Geotechnical Engineering and Engineering Geology
    • Geology

    Keywords

    • Arsenopyrite
    • Invisible gold
    • Khangalas
    • LA‐ICP‐MS
    • Metasomatite
    • Northeast Russia
    • Orogenic gold deposit
    • Pyrite
    • Trace elements

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