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东天山三岔口铜矿床类型、赋矿岩石成因与矿床矿物学特征
引用本文:秦克章,张连昌,丁奎首,许英霞,唐冬梅,徐兴旺,马天林,李光明.东天山三岔口铜矿床类型、赋矿岩石成因与矿床矿物学特征[J].岩石学报,2009,25(4):845-861.
作者姓名:秦克章  张连昌  丁奎首  许英霞  唐冬梅  徐兴旺  马天林  李光明
作者单位:1. 中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京,100029
2. 中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京,100029;河北理工大学资源与环境学院地质系,唐山,063009
3. 中国地质科学院地质力学研究所,北京,100081
基金项目:中国科学院知识创新工程重要方向项目(KZCX2-YW-107)与国家科技支撑计划新疆305项目东天山铜镍矿专题(2006BAB07B03-01、2001BA609A-07-07)
摘    要:在野外系统考察及采样基础上,以等离子光谱(ICP)对东天山三岔口铜(钼)矿床赋矿石英闪长玢岩、花岗闪长岩、花岗闪长斑岩的主、微量元素及Sr-Nd同位素组成进行测定,揭示了该矿区容矿岩石实属C型埃达克岩类,形成于二叠纪早期,产于碰撞增厚背景。通过扫描电镜、电子探针及X射线衍射,重点分析并研究了以黑云母为主的暗色硅酸盐矿物、硫化物、铁-钛氧化物以及其它有关副矿物的标型特性,旨在对判别矿床成因类型、预测成矿远景提供依据。据多数黑云母中的Mg/Fe比值>0.52之事实,可推断出本地区虽具一定成矿潜力,但因赋矿埃达克岩中Mg#<40,且不属于俯冲洋壳成因,找到大型规模矿床的可能性不大。磁铁矿的标型显示本矿床具有部分夕卡岩型特色,而富锰钛铁矿与其寄主埃达克岩有同样的形成物理、化学条件,显示二者成因密切相关。通过对辉钼矿多型的X射线分析,以及硫化物中Au/Ag比的研究,进一步证实本矿床属于斑岩型-叠加热液脉型矿床。对硫化物微量元素的测定,揭示了本矿床富钴的事实,一种少见的硫铜钴矿的发现更加证实这一认识,进而指出对钴综合利用的重要性。

关 键 词:三岔口铜矿床  C型埃达克岩  黑云母  硫铜钴矿  斑岩型和中温热液脉状矿床  东天山
收稿时间:2008/11/1 0:00:00
修稿时间:2009/2/15 0:00:00

Mineralization type, Petrogenesis of ore-bearing intrusions and mineralogical characteristics of Sanchakou copper deposits in eastern Tianshan
QIN KeZhang,ZHANG LianChang,DING KuiShou,XU YingXi,TANG DongMei,XU XingWang,MA TianLin and LI GuangMing.Mineralization type, Petrogenesis of ore-bearing intrusions and mineralogical characteristics of Sanchakou copper deposits in eastern Tianshan[J].Acta Petrologica Sinica,2009,25(4):845-861.
Authors:QIN KeZhang  ZHANG LianChang  DING KuiShou  XU YingXi  TANG DongMei  XU XingWang  MA TianLin and LI GuangMing
Affiliation:Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; Department of Geology, Hebei Polytechnic University, Tangshan 063009, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Geodynamics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract:According to the field work and major elements, trace elements and Sr-Nd isotope data of hosted rocks of quartz diorite, granodiorite and granodioritic porphyry in Sanchakou copper deposit of porphyry type and vein type, we found that hosted rocks are of C-type adakite. Through a series of analysis of scan electron microscope (SEM), electron probe microscope (EPMA), X-ray diffraction analysis, we determine the type characters of silicate minerals (mainly Biotite), sulfide, Fe-Ti oxide and accessory minerals, those analyses provide important evidences of judging the ore genesis and forecasting metallogenetic potential. In addition, we have found carrolite infrequented in nature and the fact that pyrite in Sanchakou enriched Co, it is beneficial to integrated using metal cobalt.
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