| 新疆伊宁县塔北铅锌矿床地质特征和S、Pb、C、O同位素组成 |
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| 引用本文： | 彭义伟,顾雪祥,王新利,章永梅,刘溪溪,于晓亮. 新疆伊宁县塔北铅锌矿床地质特征和S、Pb、C、O同位素组成[J]. 现代地质, 2014, 28(4): 674-685 |
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| 作者姓名： | 彭义伟 顾雪祥 王新利 章永梅 刘溪溪 于晓亮 |
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| 作者单位： | (1. 中国地质大学(北京)地球科学与资源学院，北京100083；2. 鑫达金银开发中心，北京100038) |
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| 基金项目： | 国家科技支撑计划项目(2011BAB06B02-02);国家自然科学基金重点项目(U1303292) |
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| 摘 要： | 塔北铅锌矿床是西天山吐拉苏盆地中新近勘查成功的一个重要热液型铅锌矿床。矿体赋存于晚泥盆世-早石炭世大哈拉军山组第五岩性段酸性凝灰岩中，受断裂构造控制。矿石硫化物的δ34S值介于0.5‰~7.3‰，估算获得成矿流体的总硫同位素值δ34S∑S约2.7‰，具岩浆硫的特征。晚期石膏的δ34S值为4.7‰~5.3‰，表明石膏可能是火山热液中的SO2发生歧化反应或火山喷发带出的H2S挥发分在近地表的氧化环境中反应生成的。矿石铅同位素组成十分稳定，并与大哈拉军山组火山岩的铅同位素组成相似，指示成矿物质来源于赋矿火山岩。碳、氧同位素组成指示成矿流体中碳主要来源于深部岩浆。塔北铅锌矿床可能属于矿化较深的浅成低温热液型矿床。
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| 关 键 词： | S、Pb、C、O同位素 成矿物质来源 浅成低温热液型矿床 塔北铅锌矿床 新疆 |
Ore Geology and Sulfur,Lead, Carbon and Oxygen Isotope Composition of the Tabei Pb-Zn Deposit,Yining County,Xinjiang |
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| PENG Yi-wei,GU Xue-xiang,WANG Xin-li,ZHANG Yong-mei,LIU Xi-xi,YU Xiao-liang. Ore Geology and Sulfur,Lead, Carbon and Oxygen Isotope Composition of the Tabei Pb-Zn Deposit,Yining County,Xinjiang[J]. Geoscience of Geosciences, 2014, 28(4): 674-685 |
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| Authors: | PENG Yi-wei GU Xue-xiang WANG Xin-li ZHANG Yong-mei LIU Xi-xi YU Xiao-liang |
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| Affiliation: | (1.School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;2.Xinda Gold-Sliver Development Centre,Beijing 10083,China) |
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| Abstract: | The Tabei Pb-Zn deposit，located in the Tulasu basin，Western Tianshan，is a newly explored hydrothermal deposit. The Pb-Zn orebodies are controlled by fault and hosted in acid tuff of the fifth member of the Upper Devonian to Lower Carboniferous Dahalajunshan Formation. The δ34S values of the sulfides in the main stage range from 0.5‰ to 7.3‰，and the estimated δ34S∑S of the ore-forming hydrothermal system is around 2.7‰，which reflects a characteristic of sulfur from magmatic source. The δ34S values of the gypsum in the late stage vary from 4.7‰ to 5.3‰，indicating that the aqueous sulfate may be derived from the disproportionation of SO2 or the oxidation of H2S. The compositions of Pb isotopes of sulfides are stable and similar to those of host volcanic rocks，suggesting that the ore-forming materials were derived from the ore-bearing volcanic rocks. Carbon and oxygen isotopic compositions of calcite show that carbon in ore-forming fluid was mainly derived from the magma. The Tabei Pb-Zn deposit may belong to the epithermal deposit with deeper mineralization. |
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| Keywords: | S Pb C and O isotopes source of ore-forming material epithermal deposit Tabei Pb-Zn deposit Xinjiang |
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