Oxygen,boron, chromium and niobium enrichment in native Au and Ag grains: A case study from the Linglong gold deposit,Jiaodong, eastern China |
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| Affiliation: | 1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Geosciences, Monash University, Melbourne, Australia;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, PR China;2. U. S. Geological Survey, Box 25046, Denver Federal Center, Denver, CO 80225, USA;3. Jiaojia Gold Company, Shandong Gold Mining Co., Ltd., Laizhou 261441, Shandong, PR China;4. Shandong Provincial Bureau of Geology and Mineral Resources, Jinan 250013, PR China;5. Shandong Gold Mining Stock Co., Ltd., Laizhou 261400, Shandong, PR China |
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| Abstract: | 
Quartz vein-type gold mineralization in the Linglong deposit constitutes one of the important sources of gold in China. Here we report the first finding of anomalous enrichment of boron (B), oxygen (O), chromium (Cr) and niobium (Nb) in native gold and Ag–Te grains from the Linglong deposit. The oxygen content of gold and silver grains ranges up to 75.83 at.%, boron up to 97.85 at.%, chromium up to 26.23 at.%, and tellurium up to 33.4 at.%. The Au precipitation is mainly linked to pyrite precipitation under reducing conditions. The HFSE enrichment including chromium (Cr) and niobium (Nb) in the gold and silver grains indicate that the ore-forming fluids were derived from high temperature magmas sourced from depth. The enrichment of low temperature Te in the native gold and silver grains, combined with the typical features of fluid ‘boiling’ as inferred from fluid inclusion studies indicate that the ore-fluids derived from depth upwelled rapidly, and metal precipitation occurred through decompression at shallower levels. Our results suggest good prospect for gold and silver at depth in Linglong. |
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