| 新疆阿尔泰托莫尔特铁(锰)矿床成矿流体研究 |
| Received:June 01, 2012 Revised:August 29, 2012 点此下载全文 |
| 引用本文：ZHANG ZhiXin,YANG FuQuan,HUANG ChengKe,LIU Feng,CHAI FengMei,GENG XinXia.2012.A study of ore-forming fluids of Tuomoerte Fe-(Mn) deposit in Altay, Xinjiang[J].Mineral Deposits,31(5):1025~1037 |
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| Author Name | Affiliation | | ZHANG ZhiXin | Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | YANG FuQuan | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | HUANG ChengKe | No.706 Geological Party, Xinjiang Nonferrous Geoexploration Bureau, Altay 836500, Xinjiang, China | | LIU Feng | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | CHAI FengMei | Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University, Urumqi 830046, Xinjiang, China | | GENG XinXia | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| 基金项目:本文为国家科技支撑计划项目(编号: 2006BAB07B02-01、2011BAB06B03-02)和公益性行业科研专项经费项目(编号: 201211073)联合资助的成果 |
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| 中文摘要:托莫尔特铁(锰)矿床赋存于上志留统—下泥盆统康布铁堡组上亚组变质火山-沉积岩系中。矿床的形成经历了火山沉积期、岩浆热液叠加改造期和区域变质期,火山沉积期为铁和锰主要成矿期。火山沉积期石英中流体包裹体类型以气液两相包裹体为主,均一温度集中于170~300℃,峰值为190℃,流体的w(NaCleq)为3.23%~22.71%,密度为0.62~1.09 g/cm3,气相和液相成分表明成矿流体富含Na+、Cl-和H2O,为中-低温、中-低盐度、中-低密度的H2O-NaCl体系。区域变质期石英中以发育含液体CO2包裹体为特征,完全均一温度介于210~523℃,w(NaCleq)为4.80%~11.33%,密度为0.85~1.05 g/cm3,气相和液相成分表明流体富含Na+、Cl-、SO42-、CO2、CH4、C2H6和N2,显示成矿流体为中-高温、中-低盐度、中-低密度的H2O-CO2-CH4-N2-NaCl体系。氢和氧同位素特征表明,火山沉积期成矿流体为海水和岩浆水的混合,区域变质期成矿流体主要为变质水混合深循环的大气降水。 |
| 中文关键词:地球化学 成矿流体 氢氧同位素 铁(锰)矿 托莫尔特 阿尔泰 |
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| A study of ore-forming fluids of Tuomoerte Fe-(Mn) deposit in Altay, Xinjiang |
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| Abstract:The Tuomoerte Fe-(Mn) deposit occurs in metavolcanic-sedimentary sequence within the upper subformation of Upper Silurian-Lower Devonian Kangbutiebao Formation. Field evidence and petrographic observation indicate three periods of metallogenesis, i.e., volcano-sedimentation, magmatic-hydrothermal activity and regional metamorphism. The majority of the Fe-Mn metallogenic activity occurred during the volcano-sedimentation period. The homogenization temperatures of the liquid inclusions in quartz of the volcano-sedimentation period are concentrated between 170℃ and 300℃, with a peak temperature of 190℃, the salinities range from 3.23% to 22.71%, and the densities range from 0.62 to 1.09 g/cm3. The vapor and liquid composition of fluid inclusions in this period show that the ore-forming fluid was rich in Na+, Cl- and H2O, indicating that the ore-forming fluid was of moderate-low temperature, moderate-low salinity and moderate-low density, belonging to the H2O-NaCl system. In regional metamorphism period, it was characterized by CO2-bearing three-phase fluid inclusions in quartz. Homogenization temperatures of this type of fluid inclusions vary from 210℃ to 523℃, salinities range from 4.80% to 11.33%, and densities range from 0.85 to 1.05 g/cm3. The vapor and liquid compositions of fluid inclusions in the regional metamorphism period show that the ore-forming fluid was rich in Na+, Cl-, SO42-, CO2, CH4, C2H6 and N2 and characterized by moderate-high temperature, moderate-low salinity and moderate-low density, belonging to the H2O-CO2-CH4-N2-NaCl system. The oxygen and hydrogen isotopic characteristics of quartz imply that the ore-forming fluid in the volcano-sedimentation period was derived from mixed magmatic water and seawater, whereas the ore-forming fluid in the regional metamorphism period was derived from mixed metamorphic water and meteoric water. |
| keywords:geochemistry ore-forming fluid hydrogen and oxygen isotope Fe-Mn deposit Tuomoerte Altay |
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