| 青海化隆地区拉水峡铜镍矿床地质、
地球化学特征及成因 |
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| 引用本文： | 高永宝,李文渊,谢燮,张照伟,郭周平,张江伟,李侃.青海化隆地区拉水峡铜镍矿床地质、
地球化学特征及成因[J].地质通报,2012,31(5):763-772. |
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| 作者姓名： | 高永宝 李文渊 谢燮 张照伟 郭周平 张江伟 李侃 |
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| 作者单位： | 1. 中国地调局西安地质调查中心,陕西西安710054;长安大学地球科学与国土资源学院,陕西西安710054
2. 中国地调局西安地质调查中心,陕西西安,710054 |
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| 基金项目： | 中国地质调查局地质大调查项目《秦祁昆造山系地质构造演化与成矿规律研究》(编号:1212011121088)、《新疆北部晚古生代大规模岩浆作用与成矿耦合关系研究》(编号:1212011121092)、《祁连-龙首山大火成岩省与金川型铜镍矿关系研究》(编号:1212010911032)、《青海省化隆县甘都地区铜镍矿调查评价》(编号:1212010918024);“十一五”国家科技支撑计划项目《秦祁昆成矿域成矿规律与预测示范研究》(编号:2006BAB01A01)、《金川含铜镍岩体形成特点及外围岩体地质对比》(编号:2006BAB01B08);国家自然科学基金项目《祁连-龙首山大火成岩省与金川型铜镍矿关系研究》(批准号:40772062)、《扬子北缘马元矿床有机质与巨量钼锌成矿关系研究》(批准号:41102050) |
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| 摘 要： | 拉水峡铜镍矿床位于化隆基性—超基性岩带中，岩体几乎全岩发生铜、镍硫化物矿化，且已遭受强烈蚀变，以角闪岩为主。岩浆期主要金属硫化物矿物组合为磁黄铁矿、黄铜矿、镍黄铁矿；热液蚀变期主要有紫硫镍矿、黄铁矿、黄铜矿、针镍矿等；氧化表生期主要为含镍高岭石、含镍绿泥石、孔雀石等。矿石轻稀土元素富集和负Eu异常明显，说明岩浆演化过程中发生了大量斜长石等的分离结晶作用。∑PGE含量平均为2460.46×10-9，(Pd+Pt)/(Os+Ir+Ru)值为0.40~2.00，表明铂族元素与岩浆深部熔离作用密切相关；但Pt/Pd(0.01~2.62)、Pd/Ir(0.91~8.77)说明热液作用对铂族元素具有一定的富集作用。S同位素组成变化范围很小，δ34S平均值为2.24‰，硫化物中的S以地幔S为主。拉水峡矿床的形成经历了岩浆融离贯入、热液叠加改造及表生氧化作用3个阶段。
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| 关 键 词： | 矿床地质 地球化学 拉水峡铜镍矿床 青海省 |
Geology, geochemistry and genesis of the Lashuixia Ni-Cu deposit in Hualong area, Qinghai Province |
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| GAO Yong-bao
,
LI Wen-yuan
,
XIE Xie
,
ZHANG Zhao-wei
,
GUO Zhou-ping
,
ZHANG Jiang-wei
,
LI Kan.Geology, geochemistry and genesis of the Lashuixia Ni-Cu deposit in Hualong area, Qinghai Province[J].Geologcal Bulletin OF China,2012,31(5):763-772. |
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| Authors: | GAO Yong-bao LI Wen-yuan XIE Xie ZHANG Zhao-wei GUO Zhou-ping ZHANG Jiang-wei LI Kan |
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| Institution: | 1.Xi′an Center of Geological Survey,China Geological Survey,Xi′an 710054,Shaanxi,China; 2.College of Earth Science and Resources,Chang′an University,Xi′an 710054,Shaanxi,China |
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| Abstract: | The Lashuixia Ni-Cu deposit is located in Hualong basic-ultrabasic belt,Qinghai Province.The Lashuixia rock body was altered intensely,mostly mineralized by Ni-Cu sulfides.The major metal minerals include pyrrhotite,chalcopyrite and pentlandite of the magmatic stage,violarite,pyrite and chalcopyrite of the hydrothermal stage,and nickel-bearing kaolinite,nickel-bearing chlorite and malachite of the oxidation stage.The LREE enrichment and negative Eu anomaly indicate that there probably existed fractional crystallization during the process of magmatic evolution.The average content of ∑PGE is 2460.46×10-9.The(Pd+Pt)/(Os+Ir+Ru) ratios(0.40~2.00) are closely related to the deep magma melting.However,because of the hydrothermal alteration,the ratios of Pt/Pd and Pd/Ir are from 0.01 to 2.62 and from 0.91 to 8.77 respectively.The average value of δ34S is 2.24‰,which indicates that S in sulfides was mainly derived from the mantle.On the whole,the ore-forming processes can be divided into magmatic,hydrothermal and oxidation stages. |
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| Keywords: | geology geochemistry Lashuixia Ni-Cu deposit Qinghai Province |
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