| 新疆阿尔泰巴特巴克布拉克铁矿床成矿作用研究 |
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| 引用本文： | 杨俊杰,柴凤梅,杨富全,张志欣.新疆阿尔泰巴特巴克布拉克铁矿床成矿作用研究[J].地质科学,2015,0(3):879-897. |
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| 作者姓名： | 杨俊杰 柴凤梅 杨富全 张志欣 |
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| 作者单位： | 1. 新疆大学新疆中亚造山带大陆动力学与成矿预测实验室 乌鲁木齐 830049;
2. 中国地质科学院 矿产资源研究所国土资源部成矿作用与资源评价重点实验室 北京 100037;
3. 中国科学院 新疆生态与地理研究所新疆矿产资源研究中心 乌鲁木齐 830011 |
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| 摘 要： | 巴特巴克布拉克铁矿床赋存于上志留-下泥盆统康布铁堡组变质火山-沉积岩系中, 近矿围岩为石榴子石矽卡岩、角闪斜长变粒岩和浅粒岩。矿体总体顺层分布, 呈似层状、透镜状及不规则状, 空间上与矽卡岩密切相关。流体包裹体研究表明, 矽卡岩阶段形成的石榴子石中发育纯气体包裹体、气体包裹体、液体包裹体、含子矿物包裹体及熔融包裹体; 退化蚀变阶段发育液体包裹体和少量气体包裹体; 石英-硫化物阶段主要发育液体包裹体、含液体CO2的三相包裹体及少量纯气体包裹体、气体包裹体和含子矿物包裹体。矽卡岩阶段均一温度变化为217 ℃~499 ℃, 在255 ℃出现峰值, 盐度(NaCleq)变化为8.68%~22.65%; 退化蚀变阶段均一温度变化为181 ℃~432 ℃, 在225 ℃出现峰值, 盐度变化为12.85%~22.65%; 石英-硫化物阶段均一温度变化为140 ℃~482 ℃, 在155 ℃出现峰值, 盐度变化为0.18%~42.40%。石榴子石、石英和方解石的 δ18 OSMOW 变化为1.8‰~7.1‰, δ18ΟΗ2Ο为 -4.79‰~4.57‰, δDSMOW 为 -128‰~-84‰, 表明矽卡岩阶段成矿流体主要为岩浆水, 混合少量大气降水; 石英-硫化物阶段大气降水所占比例明显增加。方解石δ13 CV-PDB 变化为 -3.2‰~-2.0‰, 表明流体中的碳来自深部或地幔。
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| 关 键 词： | 铁矿床 矽卡岩 流体包裹体 碳、氢、氧同位素 成矿作用 巴特巴克布拉克 阿尔泰 |
| 收稿时间： | 2014-12-30 |
| 修稿时间： | 2014-12-30; |
Metallogenesis of Batebakebulake iron deposit in Altay,Xinjiang |
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| Yang Junjie,Chai Fengmei,Yang Fuquan,Zhang Zhixin.Metallogenesis of Batebakebulake iron deposit in Altay,Xinjiang[J].Chinese Journal of Geology,2015,0(3):879-897. |
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| Authors: | Yang Junjie Chai Fengmei Yang Fuquan Zhang Zhixin |
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| Institution: | 1. Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University, Ürümqi 830049;
2. Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;
3. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Ürümqi 830011 |
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| Abstract: | The Batebakebulake iron deposit occurs in metavolcanite-sedimentary sequence of the Upper Silurian-Lower Devonian Kangbutiebao Formation, with the host rocks being garnet skarn, hornblende-plagioclase leptynite, leptite. Ore bodies are largely concordant with the bedding of the strata, and occurs as stratiform-like, lenses and irregular shapes, the distribution of the ore bodies is spatially related to skarn. Research shows that fluid inclusions in garnet of skarn stage are pure vapor inclusions, vapor inclusions, liquid inclusions, daughter mineral-bearing inclusions and melt mineral-bearing inclusions. Retrogressive metamorphism stage is liquid inclusions and a little vapor inclusions. Quartz-sulfide stage is main liquid inclusions, three-phase CO2-type inclusions and a little pure vapor inclusions, vapor inclusions, daughter mineral-bearing inclusions. Homogenization temperatures of fluid inclusions in skarn stage vary from 217 ℃ to 499 ℃, with the peak around 255 ℃, salinity ranges from 8.68% to 22.65% NaCl equiv. Homogenization temperatures of fluid inclusions in retrogressive metamorphism stage vary from 181 ℃ to 432 ℃, with the peak around 225 ℃, salinity ranges from 12.85% to 22.65% NaCl equiv. Homogenization temperatures of fluid inclusions in quartz-sulfide stage vary from 140% to 482 ℃, with the peak around 155 ℃, salinity ranges from 0.18% to 42.40% NaCl equiv. The δ18 OSMOW values of garnet, quartz and calcite range from 1.8‰ to 7.1‰, with the corresponding δ18 OH2O values between -4.79‰ and 4.57‰, and δDSMOW values of fluid inclusions between -128‰ and -84‰. The combined isotopic data imply that the ore-forming fluids of the skarn stage in the Batebakebulake iron deposit were mainly derived from magmatic fluids, with a minor part from the meteoric water, and in quartz-sulfide stage meteoric water increased obviously. The δ13 CV-PDB values of calcite from the Batebakebulake iron deposit define a narrow range of -3.2‰ to -2.0‰, indicating that the carbon in the fluids was mainly derived from the mantle or a deep-seated place. |
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| Keywords: | Iron deposit Skarn Fluid inclusions Carbon-oxygen-hydrogen stable isotopes Metallogeny Batebakebulake Altay |
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