| 新疆北山小常山铁矿矿物电子探针分析及矿床成因探讨 |
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| 引用本文： | 张博,吕新彪,刘月高.新疆北山小常山铁矿矿物电子探针分析及矿床成因探讨[J].岩石矿物学杂志,2016,35(3):517-530. |
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| 作者姓名： | 张博 吕新彪 刘月高 |
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| 作者单位： | 北京大学 地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;中国地质大学 资源学院, 湖北 武汉 430074;中国地质大学 资源学院, 湖北 武汉 430074;中国地质大学 地质调查研究院, 湖北 武汉 430074;中国地质大学 地质调查研究院, 湖北 武汉 430074;中国地质调查局西安地质调查中心, 陕西 西安 710054 |
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| 基金项目： | 新疆地矿局重点研究项目(XGMB2012012);"十二五"国家科技支撑计划(国家305项目)(2011BAB06B04);中国博士后科学基金(2015M582762XB) |
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| 摘 要： | 小常山铁矿位于新疆北山裂谷带西段,矿体赋存于辉长岩、辉长岩和大理岩接触带中,部分赋存于花岗闪长岩和大理岩接触带。前人研究辉长岩年龄为276±1.2Ma,与坡北铜镍硫化物岩浆矿床形成年龄一致,同属早二叠世。小常山铁矿中可见有明显的岩浆贯入现象。矿体主要呈透镜状、块状、脉状、薄层状。金属矿物主要为磁铁矿,含极少量的褐铁矿和黄铁矿;近矿围岩蚀变较弱,主要有石榴子石化、绿帘石化、大理岩化。电子探针研究表明,磁铁矿FeOT含量范围较大,主要分布在85%范围以上,Al_2O_3含量相对较高,TiO_2-Al_2O_3-(MgO+MnO)图解、TiO_2-Al_2O_3-MgO图解均显示热液接触交代成因特点,表明小常山铁矿的形成和岩浆热液的交代作用有关。石榴子石属于钙铝榴石-钙铁榴石系列,与典型矽卡岩矿床的石榴子石端员组分组成有一定差别。结合小常山铁矿体地质特征以及电子探针分析测试等研究,认为小常山铁矿是多成因的复合型矿床,具有岩浆成因和热液成因特征,但后者是主要成因。
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| 关 键 词： | 新疆北山 小常山铁矿 电子探针 岩浆成因 热液成因 早二叠世 |
| 收稿时间： | 2015/11/30 0:00:00 |
| 修稿时间： | 2016/1/30 0:00:00 |
Electron microprobe analysis of minerals and genesis of the Xiaochangshan iron deposit in Beishan area, Xinjiang |
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| ZHANG Bo,L&#; Xin-biao and LIU Yue-gao.Electron microprobe analysis of minerals and genesis of the Xiaochangshan iron deposit in Beishan area, Xinjiang[J].Acta Petrologica Et Mineralogica,2016,35(3):517-530. |
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| Authors: | ZHANG Bo L&#; Xin-biao and LIU Yue-gao |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education;School of Earth and Space Science, Peking University, Beijing 100871, China;Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;Xi''an Center of Geological Survey, China Geological Survey, Xi''an 710054, China |
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| Abstract: | Located in the west of the Beishan metallogenic belt in Xinjiang, the Xiaochangshan iron deposit is hosted in gabbro and the contact zone of the gabbro and marble. Parts of the orebodies are hosted in the contact zone of the granodiorite and the marble. Previous researchers hold that the age of gabbro in the mining area is (276±1.2) Ma, similar to the age of gabbro in the Pobei copper-nickel-sulfide orebodies, so they both belong to Early Permian. The magma injection is an obvious phenomenon in the Xiaochangshan iron deposit. The orebodies occur as lenses, lumps, veins and thin layers. Metal minerals are mainly magnetite, with very little limonite and pyrite. The country rock alteration in the Xiaochangshan iron deposit is weak, comprising mainly garnetization, epidotization and marbleization. The electron microprobe analyses of magnetite show that the content of FeOT in different iron ores has a large distribution range, and the content of Al2O3 is relatively higher. The ternary plot of TiO2-Al2O3-(MgO+MnO) and TiO2-Al2O3-MgO suggest that the formation of the Xiaochangshan iron deposit was associated with hydrothermal metasomatism of magmatic-hydrothermal fluid. The electron microprobe analyses of garnet show that the garnets from the Xiaochangshan iron deposit belong to andradite-grossular solid solution series, somewhat different fromthings of the typical skarn deposits. Combining the geological characteristics of the Xiaochangshan iron deposit with the study of the electron microprobe analyses, the authors believe that the Xiaochangshan iron deposit belongs to the polygenetic and compound deposit with magnetic and hydrothermal genesis, with the latter factor probably playing the major role. |
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| Keywords: | Beishan area Xinjiang Xiaochangshan iron deposit electron microprobe magmatic genesis hydrothermal genesis Early Permian |
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