M agmatic Gold Mineralization in the Western Qinling Orogenic Belt: Geology and Metallogenesis of the Baguamiao,Liba and Xiaogouli Gold Deposits |
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| Authors: | FENG Jianzhong WANG Dongbo WANG Xueming ZENG Yishan and LI Tiefeng Beijing Institute of Geology for Mineral Resources Beijing |
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| Institution: | FENG Jianzhong,WANG Dongbo,WANG Xueming,ZENG Yishan and LI Tiefeng Beijing Institute of Geology for Mineral Resources,Beijing,Institute of Geology,Chinese Academy of Geological Sciences,Beijing Development and Research Center of the China Geological Survey,Beijing School of Earth and Space Sciences,Peking University,Beijing |
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| Abstract: | The superlarge Baguamiao, large Liba and Xiaogouli gold deposits represent three typical gold deposits different from the Carlin type in the western Qinling Orogenic Belt. Based on Ar-Ar dating of quartz from ores, U-Pb dating of single zircon from granite, tracing of H and O isotopes and studies on the mineralogy and texture of spots and bleached alteration developed in wall rocks, this paper focuses the relations between gold deposits and granite to clarify the origin of gold deposits and the metallogenesis in the tectonic evolution of the Qinling Orogenic Belt. The comprehensive studies show that the age of the granite (148.1-244 Ma) is identical with that of the gold deposits (131.91-232.56 Ma). It is suggested that the granite has close temporal, spatial and genetic relationship with the gold deposits. The granite provides a heat source, water source and considerable amount of ore-forming material. Finally, it is concluded that the orogeny by collision, emplacement of the granite and positioning of the gold deposits represent a successive process. Both the granite and gold deposits resulted from the syn-orogeny and post-orogeny tectonic evolution. |
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| Keywords: | Western Qinling Orogenic Belt Baguamiao Gold Deposit Liba Gold Deposit Xiaogouli Gold Deposit granite |
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