STUDY ON FLUID INCLUSIONS OF LIUJU AND HAOJIAHE COPPER DEPOSITS IN CHUXIONG RED BED BASIN, YUNNAN, CHINA*

摘要

In conclusion, the metallogenic mechanism of sandstone-type copper deposits in the Chuxiong basin was the evolutional process from the diagenetic preconcentration to further enrichment in tectonic reworked period. The precipitation of copper sulfides at the interface between purple bed and grey bed was the result of the mixing action of the oxidizing, alkaline and copper-bearing fluids and the reducing, organic-rich and sulfur-bearing fluids in the sandstone stratum with high permeability, which formed the disseminated or laminated ores. while, the further evolution of reworked period formed the high-grade banded, veined ores, which is controlled by the orefield tectonic.