THE IMPOUNDING FORMATION AND METALLOTECTONICS OF SEDIMENT-HOSTED COPPER DEPOSITS
Xiao Rongge;Chen Huiquan;Shuai Kaiye;Yang Zhongfang
Sediment-hosted copper deposits are mainly postsedimentury.The ore-forming elements andfluid are originated from sedimentary basin. The coarse elastic rock with higher porosity and permeability than the upper and lower sedimentbed is the passase of fluid and the reservoir of sediment-hostedcopper depositS. Above the ore housing beds,there is a red fine-grained elastic rock series of 3 km thickness consisting of marlite, mudstone, siltstone, carbergillite and evaporite, acting as a water-resistinglayer. Hydrothermal alteration occurs in the coarse elastic sediments with Cu-bearing sulfides. Red ciastie rocks are intersected with white sandstone transversally and vertically. Cu-bearing sulfides are associated mainly with iron--bearing carbonate cements and Carbonatite veins. The Cu-bearing fluid flows along the permeable coarse elastic beds and precipitates Cu-bearing sulfides along epicontinents,upwarping zones,karst caves and folded-faulted zones.