地洼盆地砂岩铜矿床成矿作用的化学动力学和热力学研究

对我国南方中新生代地洼盆地中的砂岩铜矿床进行了化学动力学与热力学的理论与实验研究。矿源岩中以辉铜矿和黄铜矿最有利于溶解和迁移，ＮａＣｌ对Ｃｕ的溶解和含矿流体的形成起了催化作用。溶液中Ｃｕ以络合物的形式迁移，其中以一价铜氯络合物为主；温度的降低和溶液中性化导致了络合物的失稳、分解和铜矿物的沉淀。铜矿物的化学动力学和热力学制约了砂岩铜矿中以辉铜矿为主及矿床分带的形成。

STUDY OF CHEMICAL KINETICS AND THERMODYNAMICS ON MINERALIZATION OF SANDSTONE COPPER DEPOSITS IN DIWA BASINS

Experiment and theoretical analyses of chemical kinetics and thermodynamics on sandstone copper deposits in Meso-Cenozoic Diwa basins in South China are ptesented in this paper. In source rock, chalcocite and chalcopyrite are favorable minerals to dissolution and transporting of Cu, and NaCl catalyzes dissolution of Cu and formation of Cu-bearing fluid.Cu is transported with complexes which are mainly chloride complexes of monovalent cuprous. The decreasing temperature and neutralization of solution cause destabilization and decomposition of complexes and precipitation of copper minerals.Chemical kinetics and thermodynamics of copper minerals constrain that chalcocite is main and ore zoning form in sandstone copper deposits.