A two-stage evolution model for the Amantaytau orogenic-type gold deposit in Uzbekistan
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- 作者：Jan Pasava ; Hartwig Frimmel ; Anna Vymazalová ; Petr Dobes…
- 关键词：Amantaytau ; Uzbekistan ; Black shale ; Orogenic gold ; Sedimentary Au source ; Pyrite chemistry
- 刊名：Mineralium Deposita
- 出版年：2013
- 出版时间：October 2013
- 年：2013
- 卷：48
- 期：7
- 页码：825-840
- 全文大小：919KB
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Hartwig Frimmel (2) (3)
Anna Vymazalová (1)
Petr Dobes (1)
Alexandr V. Jukov (4)
Rustam I. Koneev (4)
1. Czech Geological Survey, Klárov 131/3, 118 21, Prague 1, Czech Republic
2. Institute of Geography and Geology, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany
3. Department of Geological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
4. National University of Uzbekistan, Vuzgorodok, 700174, Tashkent, Uzbekistan - ISSN：1432-1866
文摘
A lithogeochemical, mineral chemical, isotopic, and fluid inclusion study of barren, low-, and high-grade Au-mineralized samples from the shear zone-hosted Amantaytau gold deposit, Uzbekistan, shows that the local host rocks, Late Ordovician–Earlz Silurian carbonacous shales, are likely to have been an important source of Au, As, Ni, and S in the formation of the deposit. Syn-depositional pyrite in these shales contains on average 0.23?ppm Au, 1,083?ppm As, and 861?ppm Ni. The distribution of rare earth elements (REE) indicates a homogeneous source of light REE, whereas the heavy REE distribution reflects most likely primary variations in the sediments. The mineralized zone is marked by a positive Eu anomaly, which supports reducing conditions during the mineralization. A hydrothermal overprint by an aqueous–carbonic fluid is reflected in a high-grade Au-mineralized sample by δ13C values of ?3.0?-(V-PDB). The δ 34S values in pyrite (?.13 to +7.30?-CDT) from barren and mineralized samples are consistent with marine sulfate being the principal source of the ore sulfur. Assuming a formation temperature of between 300 and 400?°C for the main stage of mineralization, as indicated by the alteration mineral assemblage, the calculated δ 18Ofluid is between 9.5 and 13.4?-V-SMOW, which points at a metamorphic origin of the ore fluid.