地质与勘探2011，Vol.47Issue(5)：794-808,15.
新疆西天山七兴铅锌成矿特征、时代和地质意义
Metallogenetic Features and Ages of the Qixing Zn-Pb deposit in the West Tian Shan of Xinjiang and Geological Implications
摘要
Abstract
The Qixing Zn-Pb deposit which was recently discovered in the West Tian Shan of Xinjiang is thought to be a part of the Lailisigao＇er-3571 Hercynian metallogenetic series.It formed in an extensional setting after orogeny.The vein-like Zn-Pb sulfide ore-bodies,paragenied or associated with some basic dikes which occur in nearly NS direction,occur in silty mud of Silurian strata and are controlled by the approximately NS faults and fractures normal to the orogenic belt.The orebodies are sharply bounded by wall rocks which have hydrothermal alteration such as silication.The Zn-Pb ore is composed of quartz,Zn-and Pb-sulfide and many other minerals,and shows a complex mineral composition.The minerals are middle-coarsely crystalline and replaced textures in the ores,characterized by hydrothermal filling-replacing in mineralization.The ore-forming fluid was middle temperature（108℃～324℃）,low salty（0.71%～6.59% eq.NaCl）,δ18OH2O V-SMOW=-0.10‰～7.50‰,δDH2O V-SMOW=-96‰～-102‰,and mainly from the magma.The ore δ34SV-CDT=2.9‰～4.8‰,and 88%～93% S was from the deep magma.The ore Pb-isotopic composition has a very small range of variation,with 206Pb/204Pb=18.1893～18.1930,207Pb/204Pb=15.6185～15.6226,208Pb/204Pb=38.1113～38.1281,and the metals in the ore were mainly related to the magma.The SHRIMP U-Pb age of zircons in the basic dikes is 186.2±8.4Ma.A Yenshan period tectonic extension – magma activity – Zn-Pb mineralization was a starting,developing and closely related geological process.Our work suggests that the Qixing Zn-Pb ore deposit is a product of the Yenshan period structure-magma-hydrothermal mineralization,rather than a part of the Lailisigao＇er–3571 Hercynian metallogenetic series.The Yenshan period metal mineralization in northern Xinjiang should be paid more attention.关键词
矿床地质/流体包裹体/S/Pb/O/H/同位素/锆石/U/-/Pb/法/燕山期成矿/七兴铅锌矿新疆西天山Key words
Ore geology/Fluid inclusion/S-Pb-O-H-isotope/Zircon U-Pb age/Yenshan period metallogeny/Qixing Zn-Pb deposit/Xinjiang/Western Tianshan分类
天文与地球科学引用本文复制引用
薛春纪,张权,冯京,王晓刚,张兵,万阈..新疆西天山七兴铅锌成矿特征、时代和地质意义[J].地质与勘探,2011,47(5):794-808,15.基金项目
国家科技支撑计划 （）
高等学校学科创新引智计划 （）
长江学者和创新团队计划（IRT0755）资助 （）
