Evidences of Exhalative Hydrothermal Sedimentary Mineralization of Indo-Chinese Epoch of Gejiu Tin-polymetallic Deposits

Abstract

Some evidences on the exhalative hydrothermal sedimentary mineralization of the Indo-Chinese epoch for the genesis of Gejiu tin-polymetallic deposits are analyzed. The results show that the age of mineralization of the ore of Lutangba-type tin-polymetallic deposit is about 200Ma,which represented for mineralization of the Indo-Chinese epoch. According to the features of the sulfur isotopes of sulfide of the deposit,sulfur in materials of mineralization came mainly from the mantle. In the ore of Lutangba-type tin-polymetallic deposit,there are a lot of oolitic pyrite,gelpyrite,stratified structure and streaked structure.