黔东金头金矿矿床地质及包裹体特征初探

A Preliminary Discussion on Geological and Inclusion Features of Jintou Gold Deposit in Eastern Guizhou

金头脉金矿床研究程度较低。本文通过对该矿床矿物粒度特征与金的关系,矿物的成生关系及矿物的包裹体特征研究,初步阐明了该矿床的地质及包裹体特征,并对矿区可能存在的盲矿体进行了初步预测。

Jintou Gold Deposit, located in Tianzhu County, Eastern Guizhou, has a longer history of nongovernmental exploitation and its research level is lower. According to basic geological features of the deposit, the writers have discussed mineral compositions, structures, relations of each other, met-allegentic epoches, metallegentic stages and formation sequences of minerals, especially the relations between mineral size and natural gold, indicating that the enrichment law of gold is not only related to structure,but also to quantity,kind and size of sulphide,that is,under the major premise of structure, the more sulphides in quartz veins, the more complex the kinds of sulphides; the smaller the mineral sizes, the closer the relations to gold. The research results have also shown that gold is mainly formed in the gold -quartz-sulphide stage and natural gold is formed later than most sulphides, with most gold under the size of 0. 10mm. A preliminary division of mineral assemblages and ore types has been also made in the paper. Based on the researches on the geological features,a geochemical study has been made of the inclusions that widely exist in quartz veins. The results show that the types of inclusions are simple, most inclusions are in a gas-liquid state, most inclusion sizes are around 5- 15μm, most inclusion shapes are irregular, the inclusion distributions are uneven and the ratio of gas and liquid is around 0-15%. A simple comparison has been made between the inclusion sizes and the ratio of gas and liquid in different quartz veins and different ore types. About temperature, the homogenization temperature data of 128 inclusions show that the ore -forming temperature is in the range of 150°-300℃, which is a moderate temperature, so the gold deposit belongs to a thermal fluid quartz vein deposit. Finally, on the basis of the research results above, the writers consider that some blind gold -bearing quartz veins Jintou anticline.