| 塔什库尔干地区赞坎铁矿矿物学特征与成因 |
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| 引用本文： | 钱兵.塔什库尔干地区赞坎铁矿矿物学特征与成因[J].地质与勘探,2014,50(4):630-640. |
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| 作者姓名： | 钱兵 |
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| 作者单位： | 西安地质调查中心，国土资源部岩浆作用成矿与找矿重点实验室，陕西西安； 新疆地矿局第二地质大队，新疆喀什 |
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| 基金项目： | 中国地质调查局地质调查项目（编号1212011121088、1212011121092和1212011120183）、国家自然科学基金青年基金项目（编号41102050）、陕西省自然科学基础研究计划项目（编号2013JM5010）、“十一五”国家科技支撑计划项目（2006BAB01A01）联合资助 |
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| 摘 要： | 赞坎铁矿石西昆仑成矿带近年来新发现的一处超大型铁矿床，矿区内广泛出露古元古代布伦阔勒变质岩层，矿体主要赋存于布伦阔勒岩群角闪斜长片岩和黑云石英片岩内部，部分产于霏细岩与黑云石英片岩接触带内。矿床由Ⅰ~Ⅶ号矿体组成，其中Ⅰ号和Ⅲ号矿体为主要矿体。根据矿石组构、矿物共生关系等特征，成矿过程可划分为早期沉积期、中期变质期及晚期岩浆热液期3个成矿期，其中，岩浆热液期可进一步划分为矽卡岩阶段、热液改造阶段和硫化物阶段。早期沉积期磁铁矿呈微细粒他形晶结构，被变质期石英颗粒包裹，以较低含量的TFeO、MgO、MnO和较高含量的TiO2、Al2O3为特征；中期变质期磁铁矿分布于条带状矿石内，他形晶粒状结构，与早期相比，TFeO、MgO、MnO等含量相对升高而TiO2、Al2O3等含量相对降低；晚期岩浆热液期矽卡岩阶段磁铁矿分布于块状矿石内，自形晶粒状结构，以相对富TFeO、MgO、MnO而贫TiO2、Al2O3为特征；晚期热液改造阶段磁铁矿分布于浸染状矿石中，半自形-自形粒状结构、交代残余结构为主，TFeO、Al2O3、TiO2、MnO等含量变化较大。认为赞坎铁矿是沉积变质型铁矿床，遭受后期岩浆热液作用交代改造。
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| 关 键 词： | 地质特征 成矿期次 岩浆热液作用 沉积变质型铁矿 赞坎铁矿 |
| 收稿时间： | 2014/2/20 0:00:00 |
| 修稿时间： | 2014/4/16 0:00:00 |
Mineralogy and genesis of the Zankan iron deposit in Taxkorgan area, Xinjiang |
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| Qian Bing.Mineralogy and genesis of the Zankan iron deposit in Taxkorgan area, Xinjiang[J].Geology and Prospecting,2014,50(4):630-640. |
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| Authors: | Qian Bing |
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| Abstract: | The Zankan iron deposit in the West Kunlun metallogenic belt is a newly discovered super large deposit. The Paleoproterozoic Bulunkuole group metamorphic rocks are widely exposed in the ore district, where orebodies mainly occur in hornblende plagioclase schist and biotite quartz schist, locally formed in the contact zone of felsite and biotite quartz schist. The iron deposit consists of seven ore bodies, wherein the No.1 and No.3 orebodies are major ones. According to the ore textures and mineral paragenesis characteristics, the formation of the Zankan iron deposit can be divided into three metallogenic epochs: the early sedimentary period, middle metamorphic period and last magmatic hydrothermal period. The magmatic hydrothermal period can be further divided into the skarn stage, hydrothermal replacementstage and sulfide stage. The magnetite with a fine anhedral crystal in the early sedimentary period is mainly distributed in quartz grains in banded ores. This type of magnetite has low TFeO, MgO, MnO, and high TiO2, Al2O3. Compared to the early period magnetite, the middle metamorphic period magnetite has an allotriomorphic granular blastic texture, in banded ores, with higher TFeO, MgO, MnO and lower TiO2, Al2O3. The magnetite of skarn stage of the late magmatic hydrothermal period has an euhedral granular structure and is enriched in TFeO, MgO, MnO, while poor in TiO2, Al2O3. The magnetite with a hypidiomorphic-euhedral granular texture and replacement remnant texture in the hydrothermal alteration stage are mainly distributed in disseminated ores, where the content of TFeO, Al2O3, TiO2, and MnO in this type of magnetite varies in a large range. A comparative analysis suggests that the Zankan iron deposit belongs to a sedimentary metamorphic iron deposit, and has experienced metasomatic alteration by late magmatic hydrothermal processes. |
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| Keywords: | mineralogy characteristics mineralization period magmatic hydrothermal sedimentary metamorphic iron deposit Zankan iron deposit |
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