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| 遵义黄家湾Ni-Mo多金属矿床成矿流体特征:来自方解石流体包裹体、REE和C、O同位素证据 | |
| 引用本文： | 冯彩霞,池国祥,胡瑞忠,刘燊,刘家军,罗泰义,齐有强.遵义黄家湾Ni-Mo多金属矿床成矿流体特征:来自方解石流体包裹体、REE和C、O同位素证据[J].岩石学报,2011,27(12):3763-3776. |
| 作者姓名： | 冯彩霞 池国祥 胡瑞忠 刘燊 刘家军 罗泰义 齐有强 |
| 作者单位： | 1. 矿床地球化学国家重点实验室,中国科学院地球化学研究所,贵阳550002 2. Department of Geology, University of Regina, Saskatchewan S4S0A2 3. 中国地质大学地球科学与资源学院,北京,100083 |
| 基金项目： | 本文受国家自然科学基金项目(40972071)及贵州省科学技术基金项目(黔科合J字[2008]号)联合资助. |
| 摘 要： | 黄家湾矿床是近几年在贵州遵义地区寒武系底部黑色页岩中新发现的以Ni-Mo为主的多元素矿床,本文首次对该矿床成矿阶段方解石的流体包裹体、REE和C、O同位素组成特征进行了系统研究.研究结果显示:(1)该矿床成矿阶段方解石中含有3种类型的流体包裹体:富液相气液两相水溶液包裹体；富气相气液两相水溶液包裹体；纯液相包裹体.它们的气相分数变化较大,显示成矿过程中可能发生过沸腾作用.流体包裹体的显微测温结果显示,成矿流体的冰点温度为-11.6～-5.5℃,流体盐度变化范围为8.55％ ～ 15.57％ NaCleqv,均一温度为109.0 ～ 181.8℃,对应流体密度为0.97 ～ 1.44g·cm-3；(2)遵义黄家湾钼-镍多金属矿床中与成矿期有关的方解石的稀土总量高且变化范围宽(39.9×10-6～ 275×10-6),配分曲线为轻稀土富集((La/Yb)N=29.6 ～63.3)的右倾型,且铕正异常明显(Eu/Eu*为2.14～14.8),与现代海底热液矿床中方解石的稀土特征类似；(3)同位素测定显示成矿流体的碳氧同位素组成分别为δ13C V-PDB=-6.3‰～-5.7‰,δ18OV-SMOW=15.6‰ ～16.0‰,计算得到流体水的δ18OV-SMOW-H2O‰平均值变化于-0.97‰～ +5.16‰之间.上述综合研究表明:黄家湾Ni-Mo多金属矿床成矿流体主要为海水和地层中的建造水(盆地热卤水),同时由海水演化来的海底热液也参与了成矿过程.成矿流体中的碳可能由深源碳与海相碳酸盐岩共同提供. |
| 关 键 词： | C-O同位素 稀土元素组成 流体包裹体 方解石 成矿流体 镍钼多金属矿床 遵义 |
| 收稿时间： | 2010/12/2 0:00:00 |
| 修稿时间： | 2011/11/15 0:00:00 |
Feature of ore-forming fluid: Evidence from fluid inclusion, REE and carbon-oxygen isotope geochemistry of calcite from Huangjiawan Mo-Ni polymetallic ore deposit, Zunyi, Guizhou Province |
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| FENG CaiXi,CHI GuoXiang,HU RuiZhong,LIU Shen,LIU JiaJun,LUO TaiYi and QI YouQiang.Feature of ore-forming fluid: Evidence from fluid inclusion, REE and carbon-oxygen isotope geochemistry of calcite from Huangjiawan Mo-Ni polymetallic ore deposit, Zunyi, Guizhou Province[J].Acta Petrologica Sinica,2011,27(12):3763-3776. | |
| Authors: | FENG CaiXi CHI GuoXiang HU RuiZhong LIU Shen LIU JiaJun LUO TaiYi and QI YouQiang |
| Institution: | State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;Department of Geology, University of Regina, Saskatchewan, S4S 0A2, Canada;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;School of the Earth Science and Resource, China University of Geoscience, Beijing 100083, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
| Abstract: | The Huangjiawan Ni-Mo polymetallic ore deposit occurred in the basal black shale sequence of the Cambrian strata in the Zunyi area, Guizhou Province, China. In order to investigate the sources of ore-forming fluids and the mechanism of mineralization, fluid inclusion, REE, carbon and oxygen isotopes studies have been performed on calcite of the main mineralization stage from the studied area. Three types of fluids inclusions, i.e., liquid-rich two-phase fluid inclusions, gas-rich two-phase inclusions, and p... |
| Keywords: | Carbon and oxygen isotope REE composition Fluid inclusions Calcite Ore-forming fluid Ni-Mo polymetallic deposit Zunyi |
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