湘西起车铅锌矿同位素地球化学特征

陈帅奇; 蒋启生; 陈渡平; 邱骏挺; 梁恩云

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DOI:10.3969/j.issn.1671-4172.2015.05.009

有色金属（矿山部分）:2015,67(5):41-46

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湘西起车铅锌矿同位素地球化学特征

陈帅奇^1,2, 蒋启生^1,3, 陈渡平^1,4, 邱骏挺^1,5, 梁恩云^1,6

(1.(1．湖南省地质调查院，长沙 410116;2．核工业北京地质研究院，北京 100029);3.2．核工业北京地质研究院，北京 100030);4.2．核工业北京地质研究院，北京 100031);5.2．核工业北京地质研究院，北京 100032);6.2．核工业北京地质研究院，北京 100033))

The isotopic geochemistry characteristics of Qiche Pb-Zn Deposit in Western Hunan Province

CHEN Shuaiqi^1,2, JIANG Qisheng^1,3, CHEN Duping^1,4, QIU Junting^1,5, LIANG Enyun^1,6

(1.(1. Hunan Institute of Geological Survey, Changsha 410016, China;2.(2. Beijing Research Institute of Uranium Geology, Beijing 100029, China);3.(2. Beijing Research Institute of Uranium Geology, Beijing 100030, China);4.(2. Beijing Research Institute of Uranium Geology, Beijing 100031, China);5.(2. Beijing Research Institute of Uranium Geology, Beijing 100032, China);6.(2. Beijing Research Institute of Uranium Geology, Beijing 100033, China))

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中文摘要: 起车铅锌矿位于湘西—鄂西成矿带内，赋矿围岩为奥陶系下统桐梓组与红花园组灰岩，矿体严格受地层、构造控制，硅化和碳酸盐化蚀变强烈。对矿床中闪锌矿、方铅矿、方解石等矿物的S-Pb-C-O-H同位素组成进行了分析测试。测试结果表明，δ34S值15.1‰～15.8‰，高于有机硫、地幔硫或岩浆硫；方解石中包裹体δ13C值－1.7‰～1.1‰，δ18OV-SMOW值12.3‰～19.0‰，与海相碳酸盐岩一致；其206Pb/204Pb为18.214～18.247，207Pb/204Pb为15.674～15.711，208Pb/204Pb为38.154～38.278，显示铀铅富集，钍铅微弱亏损。同位素特征显示成矿流体主要来自海相碳酸盐岩的溶解，成矿物质来源于容矿地层及下伏地层。尝试提出矿床成因类型属具层控特征的低温热液型矿床。

中文关键词: 铅锌矿同位素地球化学

Abstract:Qiche Pb-Zn Deposit is located in Western Hunan-Hubei metallogenic belt, which is hosted in the lower Ordovician Honghuayuan and Tongzi group limestone. The ore bodies, whose wall rocks are strongly silicification and calcitization altered, are obviously controlled by strata and regional structures. This paper presents new tests and analysis for the mineral S-Pb-C-O-H isotopic compositions such as galena, sphalerite, and calcite in this deposit. As the result shows, the δ34S values of the ore minerals are from +15.1‰ to +15.8‰, higher than those of organic matter, mantle and magmatic rocks. The δ13CCO2 values of its ore-fluids vary from -1.7‰ to +1.1‰ and the δ18O values of the ore minerals from 12.3‰ to 19.0‰, which is consistent with those of the marine carbonate. The ore minerals have a unified lead isotope compositions, with 206Pb/204Pb = 18.214~18.247, 207Pb/204Pb = 15.674~15.711, 208Pb/204Pb = 38.154~38.278, indicating the samples are enriched in uranium-related lead, but depleted in thorium-related lead. The isotopic characteristics indicate that the ore-forming fluid mainly source from the dissolution of marine carbonate rocks, while the ore-forming materials came from the ore hosting strata and lower strata. The deposit belongs to the epithermal deposit rich in strata bound.

keywords: Pb-Zn Deposit isotopic geochemistry

文章编号： 中图分类号： 文献标志码：

基金项目:中国地质调查项目(212011120785)

引用文本：
陈帅奇,蒋启生,陈渡平,邱骏挺,梁恩云.湘西起车铅锌矿同位素地球化学特征[J].有色金属（矿山部分）,2015,67(5):41-46.
CHEN Shuaiqi,JIANG Qisheng,CHEN Duping,QIU Junting,LIANG Enyun.The isotopic geochemistry characteristics of Qiche Pb-Zn Deposit in Western Hunan Province[J].NONFERROUS METALS(Mining Section),2015,67(5):41-46.

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作者	单位
陈帅奇	(1．湖南省地质调查院，长沙 410116；2．核工业北京地质研究院，北京 100029)
蒋启生	(1．湖南省地质调查院，长沙 410116；2．核工业北京地质研究院，北京 100030)
陈渡平	(1．湖南省地质调查院，长沙 410116；2．核工业北京地质研究院，北京 100031)
邱骏挺	(1．湖南省地质调查院，长沙 410116；2．核工业北京地质研究院，北京 100032)
梁恩云	(1．湖南省地质调查院，长沙 410116；2．核工业北京地质研究院，北京 100033)

Author Name	Affiliation
CHEN Shuaiqi	(1. Hunan Institute of Geological Survey, Changsha 410016, China (2. Beijing Research Institute of Uranium Geology, Beijing 100029, China)
JIANG Qisheng	(1. Hunan Institute of Geological Survey, Changsha 410016, China (2. Beijing Research Institute of Uranium Geology, Beijing 100030, China)
CHEN Duping	(1. Hunan Institute of Geological Survey, Changsha 410016, China (2. Beijing Research Institute of Uranium Geology, Beijing 100031, China)
QIU Junting	(1. Hunan Institute of Geological Survey, Changsha 410016, China (2. Beijing Research Institute of Uranium Geology, Beijing 100032, China)
LIANG Enyun	(1. Hunan Institute of Geological Survey, Changsha 410016, China (2. Beijing Research Institute of Uranium Geology, Beijing 100033, China)