| 内蒙古车户沟钼铜矿成矿年代学及成矿流体特征研究 |
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| 引用本文： | 孟树,闫聪,赖勇,舒启海,孙艺.内蒙古车户沟钼铜矿成矿年代学及成矿流体特征研究[J].岩石学报,2013,29(1):255-269. |
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| 作者姓名： | 孟树 闫聪 赖勇 舒启海 孙艺 |
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| 作者单位： | 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871 |
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| 基金项目： | 本文受中国地质调查局项目(1212010981009)资助. |
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| 摘 要： | 内蒙古车户沟斑岩钼铜矿床位于西拉木伦钼矿带内.含矿花岗斑岩的LA-ICP-MS锆石U-Pb年龄为251.6±3.2Ma,9件辉钼矿样品Re-Os同位素等时线年龄为250.2±7.2Ma,表明成矿作用发生在早三叠世.车户沟钼铜矿床成矿流体演化可分为矿前阶段、早阶段、中阶段和晚阶段.矿前阶段以斑晶石英+磁铁矿为标志,流体以高温、低盐度、富CO2为特征；早阶段是辉钼矿沉淀的主要阶段,流体包裹体均一温度分布范围为210 ～ 423℃,盐度范围为5.3％ ～45.8％ NaCleqv,部分不同类型不同盐度的包裹体密切共生,但均一温度接近,指示沸腾作用发生；中阶段为黄铜矿沉淀的主要阶段,未见含CO2包裹体,流体包裹体均一温度为210 ～ 391℃,盐度范围为1.7％ ～43.8％ NaCleqv;晚阶段为石英-碳酸盐±黄铁矿脉,只发育富液相水溶液包裹体,均一温度低于260℃,盐度为2.4％～11.4％ NaCleqv.因此,车户沟矿床成矿流体由初始的高温、富CO2,经沸腾作用和CO2逃逸,演化为低温、贫CO2.车户沟氢氧同位素特征早阶段流体(δ18OH2o=5.1‰～5.7‰,δDH2o=-91‰ ～-88‰)属于岩浆热液,中、晚阶段(δ18OH2O=-5.1‰～4.2‰,δDH2O=-105‰～-84‰)介于岩浆水和大气降水之间,指示成矿过程中有大气降水加入.
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| 关 键 词： | 锆石U-Pb年龄 Re-Os等时线年龄 流体包裹体 氢氧同位素 车户沟钼铜矿床 |
| 收稿时间： | 9/5/2012 12:00:00 AM |
| 修稿时间： | 2012/12/1 0:00:00 |
Study on the mineralization chronology and characteristics of mineralization fluid from the Chehugou porphyry Mo-Cu deposit, Inner Mongolia |
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| MENG Shu,YAN Cong,LAI Yong,SHU QiHai and SUN Yi.Study on the mineralization chronology and characteristics of mineralization fluid from the Chehugou porphyry Mo-Cu deposit, Inner Mongolia[J].Acta Petrologica Sinica,2013,29(1):255-269. |
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| Authors: | MENG Shu YAN Cong LAI Yong SHU QiHai and SUN Yi |
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| Institution: | Key Laboratory of Orogen and Crust Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogen and Crust Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogen and Crust Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogen and Crust Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogen and Crust Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | |
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| Keywords: | Zircon U-Pb age Re-Os isochron age Fluid inclusion H-O isotope Chehugou Mo-Cu deposit |
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