西天山金铜多金属重要成矿类型、成矿环境及找矿潜力

Metallogenic environments,ore-forming types and prospecting potential of Au-Cu-Zn-Pb resources in Western Tianshan Mountains

西天山跨乌兹别克斯坦、塔吉克斯坦、吉尔吉斯斯坦、哈萨克斯坦南部和中国新疆西天山,东西绵延2500 km,是"亚洲金腰带"核心地带,金铜铅锌矿产优势明显,中国新疆西天山金铜铅锌重大找矿发现令人期待。通过广泛深入的文献调研和较全面的地质矿产调查,论文针对重要成矿类型、成矿环境和找矿潜力的研究表明,西天山金铜铅锌成矿重要类型是造山型金矿、斑岩型金铜矿、SEDEX型和砂岩型铅锌矿等。造山型金矿形成于古生代俯冲增生和碰撞造山两类地质环境,斑岩型金铜矿形成于古生代不同时期的成熟岛弧环境,SEDEX型铅锌矿在新元古代陆缘盆地富集,砂岩型铅锌矿形成于中—新生代山前盆地。西天山金铜铅锌成矿类型和环境优越,找矿潜力巨大,新疆西天山有望实现金铜铅锌找矿持续重大突破。本文为西天山区域成矿研究和金铜铅锌找矿勘查提供了新的参考和引导。

Western Tianshan Mountains extend from Uzbekistan through Tajikistan, Kyrgyzstan, southern Kazakhstan to Xinjiang Western Tianshan, with a length of 2500 km from west to east. This belt is the core zone of the＂Asian Gold Belt＂and shows evident potential of Au-Cu-Zn-Pb mineral resources. Large Au-Cu-Zn-Pb ore deposits are expected to be found in Western Tianshan of Xinjiang. Based on consulting various references and thoroughly investigating the regional geology and mineral resources in western Tianshan, the authors hold that the important mineralizations of Au- Cu- Zn- Pb ore deposits include such types as orogenic Au,porphyry Au-Cu, SEDEX and sandstone Zn-Pb. The orogenic Au deposits formed in two geological environments in the Paleozoic,the porphyry Cu deposits formed in the mature island orc environments of various periods in the Paleozoic, the SEDEX Zn- Pb deposits occurred in the continental margin basin of the Neoproterozoic, and the sandstone Zn-Pb deposits occurred in the foreland basin of Mesozoic- Cenozoic period. The metallogenic environment and the ore- forming types are all favorable for the Au- CuZn-Pb mineralization in Western Tianshan and show promising potential for ore prospecting. The large Au-Cu-Zn-Pb ore deposits could be found continuously in Xinjiang Western Tianshan, China. The results obtained by the authors provide reference and indication for regional metallogenic understanding and Au-Cu-Zn-Pb ore exploration.