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Chemical reactions of plagioclase, biotite and their single minerals, as well as a mineral mixture of (plagioclase +biotite+quartz), with KCI and (KCI+KHCO3) solutions were carried out at 150-400℃ 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 CI- and CO2 play important roles in the reaction process.
Chemical reactions of plagioclase, biotite and their single minerals, as well as a mineral mixture of (plagioclase + biotite + quartz), with KCI and (KCI + KHCO3) solutions were carried out at 150-400 ° C and 50-80 MPa. 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. Thus the transportation and enrichment of gold are related to the elementary effect of the fluid-mineral interfaces. Fe3 + -Fe2 +, as an oxidization-reduction agent, and volatile components CI- and CO2 play important roles in the reaction process.