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
| Autor: | Maxim V. Kudrin, Lyudmila Yu. Kryuchkova, L. I. Polufuntikova, Valery Yu. Fridovsky |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Mineralization (geology)
lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Metamorphic rock Geochemistry trace elements invisible gold metasomatite engineering.material 010502 geochemistry & geophysics 01 natural sciences orogenic gold deposit δ34S Metasomatism LA-ICP-MS 0105 earth and related environmental sciences Arsenopyrite lcsh:Mineralogy northeast Russia Trace element Geology Geotechnical Engineering and Engineering Geology pyrite Diagenesis visual_art Khangalas engineering visual_art.visual_art_medium arsenopyrite Pyrite |
| Zdroj: | Minerals Volume 11 Issue 4 Minerals, Vol 11, Iss 403, p 403 (2021) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min11040403 |
| Popis: | 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-geochemical 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 generations of pyrite (Py1, diagenetic Py2, metamorphic Py3, metasomatic Py4, veined) and two generations 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 typochemical 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, isomorphically entering the crystal lattice or its defects. Isotope characteristics of hydrothermal sulfides (d34S = –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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|