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湖北铜绿山矽卡岩型铜铁矿床同位素地球化学研究
引用本文:王彦博,顾雪祥,张宗保,董树义.湖北铜绿山矽卡岩型铜铁矿床同位素地球化学研究[J].现代地质,2011,25(4):730-739.
作者姓名:王彦博  顾雪祥  张宗保  董树义
作者单位:1. 中国地质大学地球科学与资源学院,北京,100083
2. 中国地质大学地球科学与资源学院,北京100083;成都理工大学地球科学学院,四川成都610059
基金项目:中国地质调查局全国危机矿山接替资源找矿项目
摘    要:湖北铜绿山铜铁矿床处于长江中下游铁铜成矿带西部鄂东成矿区内,是鄂东南地区典型的矽卡岩型铜铁矿床。矿体呈透镜状产于下三叠统大冶群第3至第7岩性段大理岩与铜绿山岩体的接触带。矿床成矿过程大致划分为干矽卡岩阶段(Ⅰ)、湿矽卡岩阶段(Ⅱ)、氧化物阶段(Ⅲ)、石英硫化物阶段(Ⅳ)和碳酸盐阶段(Ⅴ)。矿石矿物主要有磁铁矿、黄铜矿、赤铁矿;脉石矿物以石榴石、石英、碳酸盐矿物为主。通过对铜绿山铜铁矿床硫、氢、氧、碳和铅同位素组成研究,探讨成矿流体来源和成矿物质来源。研究表明,成矿流体早期以岩浆热液为主,有少量大气降水加入,后期大气降水比重加大;热液中的碳主要为深源岩浆来源,少量来自海相碳酸盐岩的溶解作用;矿石中硫化物的硫同位素组成特征反映了硫来自深源岩浆;矿石铅同位素组成稳定,为正常铅,矿石铅源于上侵过程中受地壳物质混染的幔源岩浆。

关 键 词:同位素地球化学  矽卡岩型矿床  铜绿山  铜铁矿床  湖北

Isotopic Geochemistry of the Tonglushan Cu-Fe Skarn Type Deposit in Hubei Province
WANG Yan-bo,GU Xue-xiang,ZHANG Zong-bao,DONG Shu-yi.Isotopic Geochemistry of the Tonglushan Cu-Fe Skarn Type Deposit in Hubei Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2011,25(4):730-739.
Authors:WANG Yan-bo  GU Xue-xiang  ZHANG Zong-bao  DONG Shu-yi
Institution:WANG Yan-bo1,GU Xue-xiang1,ZHANG Zong-bao1,DONG Shu-yi1,2(1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China,2.College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China)
Abstract:Located in the southeastern Hubei metallographic province of the Middle-Lower Yangtze River Fe-Cu metallogenic belt,the Tonglushan Cu-Fe deposit is a typical skarn Cu-Fe deposit in the southeastern Hubei metallographic province.The ore bodies,in the lenticular forms,occur in the contact zone between the marble of 4th-7th Members of the Lower Triassic Daye Group.The ore-forming process can be divided roughly into five stages:the anhydrous skarn stage(Ⅰ),the hydrous skarn stage(Ⅱ),the oxide stage(Ⅲ),the quartz-sulfide stage(Ⅳ) and the carbonate stage(Ⅴ).Ore minerals mainly include magnetite,chalcopyrite and hematite;gangue mineral include mainly garnet,quartz and carbonate mineral.This paper mainly studied sulfur,hydrogen,oxygen,carbon,lead isotopic compositions and analyzed the indicative meaning of these isotopes to chemistry of the ore fluids and the sources of the ore-forming materials and intrusions.The composition of H and O isotopes shows that ore fluids were most likely composed of magmatic water mixed with limited meteoric water at the early ore-forming stage and mixed with much meteoric water at the late ore-forming stage.Sulfur and carbon isotopic data suggest that the ore forming materials were mainly derived from the deep magma and the carbon was derived subordinately from the dissolution of wall rocks or the mantle.The Pb isotopic composition of ore sulfides are stable and they are ordinary common lead.Ore lead was derived from mantle magma which was subjected to the hybridization of crust materials in the course of intruding upward.
Keywords:isotope geochemistry  skarn type deposit  Tonglushan  Cu-Fe deposit  Hubei Province  
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