Experimental study of gold activation-transportation in the process of potash metasomatism-alteration——North China platform gold deposit taken as an example |
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Authors: | WANG Yurong HU Shouxi |
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Institution: | 1. Guangzhou Geochemistry Institute, Chinese Academy of Sciences, Guangzhou 510640, China 2. State key Laboratory of Endogenetic Mineralization Mechanism, Geological Department, Nanjing University, Nanjing 210093, China |
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Abstract: | Chemical reactions of plagioclase, biotite and their singleminerals, as well as a mineral mixture of (plagioclase +biotite+quartz), with KCl and (KCl+KHCO3) solutions were carried out at 150400℃ and 5080 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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