As–Sb–Bi–Au mineralization in the Baogutu gold deposit,Xinjiang, NW China |
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| Institution: | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Science, Peking University, Beijing 100871, China;2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China;3. ARC Centre of Excellence in Ore Deposits (CODES), School of Physical Sciences, University of Tasmania, Hobart 7001, Australia;1. Bundesanstalt für Geowissenschaften und Rohstoffe, D-30631 Hannover, P.O. Box 510163, Germany;2. Landesamt für Bergbau, Energie und Geologie, Stilleweg 2, D-30655 Hannover, Germany;3. Department of Earth and Planetary Sciences Birkbeck, University of London, Malet St., London WC1E 7HX, United Kingdom;1. U.S. Geological Survey, PCMSC, 2885 Mission St., Santa Cruz, CA 95060, USA;2. Institute for Geology and Mineral Resources of the Ocean (VNIIOkeangeologia), Angliysky Avenue 1, 190121 St. Petersburg, Russia |
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| Abstract: | Here we report the occurrence of some uncommon mineral assemblages including pääkönenite, aurostibite, native arsenic, native antimony, and native bismuth found in the Baogutu gold deposit in the western Junggar, Xinjiang, NW China. The mineralization could be generally subdivided into two types: the gold-bearing quartz-vein type mineralization and disseminated mineralization in the wall rocks. The sulfide minerals in gold lodes commonly include pyrite, arsenopyrite, marcasite, and stibnite. However, the L7 lode in No. 4 orebody and the L1 lode in No. 11 orebody of the Baogutu gold deposit are quite different in terms of their mineral assemblages. The L7 lode contains native arsenic–quartz veins in shallow levels and stibnite–quartz veins at depth. Gold-bearing minerals (electrum, native gold, and rarely aurostibite) mainly coexist with pääkönenite, stibnite, native arsenic, and native antimony. The crystallization of As- and Sb-bearing minerals was likely to have consumed H2S from the hydrothermal fluid, which probably triggered the precipitation of native gold. The L1 lode consists of several discontinuous sulfide-dominated lensoid orebodies. The massive sulfide ores that produced most of the gold resource are characterized by an intimate association between native bismuth and native gold mineralization. |
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