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《Geochimica》 2001-06
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Mass and energy transport in ore forming processes of sulfide deposits in Tongling district

CEN Kuang1, YU Chong wen2(School of Earth Sciences and Land Resources, China University of Geosciences, Beijing 100083, China)  
Temperature and stream fields of fluid flow in ore forming processes of copper and gold sulfide deposits were modeled and analyzed in the Tongling district based on dynamics theory of heat conduction, fluid flow caused by heating and chemical material transport induced by fluid flow. The results show that mass and energy flow caused by fluid flow is a key factor of hydrothermal ore forming processes; the heating come from magma intruded is base power of driving fluid flow. Occurrence of pluton, spatial combination of wall rocks with different chemical property, and their different porosity and infiltration restrictthe specifically field of precipitation and accumulation for ore forming matter. Therefore, the dissolution and precipitation places for ore forming matterin deposit can be forecasted. Iron and sulfur matter comes mostly from sandstones, which contains pyrite and high porosity. The cataclastic dolomite interlayered in sandstones and limestones is a favorable place for ore accumulating. The difference of chemical potential between sandstone and dolomite forms a favorableinterface for ore forming processes.
【Fund】: 国家自然科学基金重点项目(49633120;49873014);; 国家攀登计划项目(95-预-39);; 地质行业基金(HY979831)
【CateGory Index】: P594
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