Physical structure features of the crust at southeast region of Tibetan Plateau |
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Authors: | Liu Hongbing Kong Xiangru Xiaobing Ma Wang Qianshen Yan Yongli Yan Yafen Yang Zhiqiang |
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Institution: | (1) Guangzhou Geochemistry Institute, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) State key Laboratory of Endogenetic Mineralization Mechanism, Geological Department, Nanjing University, 210093 Nanjing, China |
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Abstract: | Chemical reactions of plagioclase, biotite and their single minerals, as well as a mineral mixture of (plagioclase+biotite+quartz),
with KCl and (KCl+KHCO3) solutions were carried out at 150–400°C and 50–80 MPa. Experiments show that alkaline fluid promotes plagioclase’s changing
into potash feldspar, while acid fluid helps plagioclase, potash feldspar and biotite alteration form chlorite and sericite.
After chemical reaction the acidity-alkalinity of solutions often changes reversely. It was observed that gold dissolved from
the tube wall and recrystallized on the surfaces of biotite and pyrite. Therefore the transportation and enrichment of gold
are related to the elementary effect of the fluid-mineral interfaces. Fe3+-Fe2+, as an oxidition-reduction agent, and volatile components Cl- and CO2 play important roles in the reaction process |
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Keywords: | gold deposit fluid water-rock reaction experimental study |
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