大巴山地区铂矿地质特征及成因初探

GEOLOGICAL FEATURES AND GENESIS OF THE PLATINUM DEPOSIT OF DABASHAN DISTRICT

大巴山铂矿产于秦岭地槽与扬子准地台的接合部位——城巴深断裂两侧的断块或岩体蚀变破碎带中 ,含矿层为上震旦统至下寒武统黑色岩系 ,含矿围岩具黄铁矿化、硅化、碳化现象。成矿物质来源、矿源初始富集与聚积成矿均与城巴深断裂的多期活动及早期火山喷发。

Dabashan platinum deposit is situated in the joint point of Qinling geosyncline and Yangzhi platform,that is,in the blocks of both sides of chengba deep fault or the altered rupture zone owing to a intrusive body. The rock layers containing orerebody consist of black rocks in the period from upper Sinian system to lower Cambrian system.The wall rocks of the orebody are of ironpyrites mineralization,carbouization and silicatization. The source of ore forming material, the initial enrichment and finally concentration are of close related to the multi period movement of chengba deep fault,early volcanism and repeated magmatism.