地洼盆地砂岩铜矿床的构造-流体-成矿体系及演化

THE TECTONIC-FLUID-METALLOGENETIC SYSTEM OF SANDSTONE TYPE COPPER DEPOSITS IN DIWA BASINS AND ITS EVOLUTION

我国南方地洼盆地构造演化、流体演化和砂岩铜矿成矿作用三者之间具有密切的关系，处于一个统一的系统之中。盆地早中期的裂陷、坳陷作用及热构造活动导致了富铜矿源层的形成、大气降水的深循环和水／岩相互作用、并形成中高温、压、高盐度的热卤水含铜流体。在构造－流体－砂岩铜矿成矿体系的演化中，构造演化制约了含铜流体的演化和砂岩铜矿的成矿作用，而主要发生于盆地演化的晚期。

There is a close relation among tectonic evolution, fluid evolution and formation of sandstonecopper deposits in diwa basins of South China. In the early and middle periods of the evolution of thebasins, rifting, depression and tectono-thermal events caused the formation of Cu-rich ore sourcebeds, the deep circulation of meteoric water and the water/rock interaction which formed the hotbrine ore-forming fluids with middle to high temperature and pressure and high salinity. During theevolution of the tectonic-fluid-copper metallogenetic system, tectonic evolution controlled the evo-lution of Cu-bearing fluids and the formation of sandstone copper deposits which occurred mainly inthe late period of the basin evolution.