The Ore Genesis And Prospecting Direction Of Datongkuang Copper Deposit, Huili County, Sichuan Province

The Huili Datongkuang copper deposit is one of the most important medium-sized copper deposits in Sichuan province. It is located between the middle of Sichuan and Yunnan tectonic zone and the West extension of Nanling east-west tectonic belt. In the Kangdian axis of the Mesozoic rift basin-southwestern side of the Huili Basin. Based on the geology information collection, collation and field geological investigation about the regional geological background, geological features of ore deposit in Datongkuang copper deposit, binding the researches of the geochemical characteristics of the copper deposits, this paper has a new light about the Datongkuang copper deposit.The Huili Datongkuang copper deposit produced in the Xiaobazu strata of late cretaceous in the Mesozoic, the Xiaobazu strata's lithology is a set of stratigraphic about the fluvial and lacustrine facies mauve clastic sedimentary rocks. Datongkuang mining area'fold structures are mainly Qingwajia anticline and Qingwajia syncline. The faults are not developed, which have less impact on the orebody. The ore bodies occur as stratified oe stratoid basically concordant with the wall rock. The major primary metal minerals of ore are chalcocite and bornite, and the secondary metal minerals are malachite and azurite, etc. Ore texture and structure are simply, the ores are mainly in granular crystalline and dissolution textures and infection cementation structures. The ore rock has not significant altered phenomenon.Based on the research of the character of ore geochemistry characteristics, it indicates that ore-bearing wall rock and orebody's macro elements, micro element and Rare-Earth Element have similar composition, which shows homology. Metallogenic materials are mainly from the stratigraphic formatiom. The components of lead isotopes reflect that the metallogenetic materials mainly come from the crust while theδ34S values range from -13.3‰to 2.8‰of ores indicate that sulfur was derived mainly from bacterial reduction of sulphates and bioaccumulation organic sulfur. Based on the study on the fluid-inclusion geochemistry of the ore deposit, it is suggested that the ore formed under the conditions of low temperature and low pressure.In addition, through the causes of the copper deposit, this paper made some brief analysis of the sedimentary pacies and metallogenic modle about the Datongkuang copper deposit. This text thinks that this copper deposit belongs to fluvial deposit. Old channel's convex bank river bed accumulation had concentration with mineralization. The copper enrichment and mineralization in the mine field mainly occurs between the middle diagenesis and the late diagenesis, metallogenic environment was redox environment. Mineralization period experienced three major evolutionary stages: sedimentary stage, tectogenesis period and the relatively stable tectonic movement stage. The metallogenic material occursed mobilization, migration and enrichment in the later process of diagenesis again.Comprehensive studies on the analytical results indicate that the ore genesis of Datongkuang copper deposit is a sedimentary sandy gravel type stratabound deposit. In the end, according to the understanding of ore genesis about the Datongkuang copper deposit, this paper makes a suitability assessment of evaluation of mineral about the Datongkuang copper deposit.