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| 西天山敦德铁矿床磁铁矿原位LA-ICP-MS元素分析及意义 | |
| 引用本文： | 段士刚,董满华,张作衡,蒋宗胜,李凤鸣.西天山敦德铁矿床磁铁矿原位LA-ICP-MS元素分析及意义[J].矿床地质,2014,33(6):1325-1337. |
| 作者姓名： | 段士刚 董满华 张作衡 蒋宗胜 李凤鸣 |
| 作者单位： | 1. 长安大学地球科学与资源学院,陕西西安710054;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 2. 内蒙古地质勘查有限责任公司,内蒙古呼和浩特,010000 3. 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 4. 新疆地质矿产勘查开发局,新疆乌鲁木齐,830000 |
| 基金项目： | 本文得到国家自然科学基金项目(编号: 41203035)、国家重点基础研究发展计划(编号: 2012CB416803)、国家科技支撑计划(编号: 2011BAB06B02)和地质矿产调查评价项目(编号: 1212011220894-2; 1212011090300)的联合资助 |
| 摘 要： | 敦德铁矿床是天山成矿带内新近发现并勘查的一处大型海相火山岩型铁矿床。该矿床的矿石可划分为浸染状、稠密浸染状、条带状和块状4种主要类型。其中的条带状矿石包括磁铁矿_矽卡岩条带和磁铁矿_方解石条带2种亚类型。块状矿石内出现围岩或矽卡岩角砾时则构成角砾状矿石,其磁铁矿的成因无甚差异。根据野外观察和矿相显微研究,认为磁铁矿形成于早期矽卡岩阶段后的退化蚀变阶段,之后又被更晚的硫化物阶段和绿泥石_碳酸盐阶段的矿物叠加。敦德磁铁矿内主要发生了Al、Mn、Mg和Zn的类质同象置换,此外,也含有Ti、Si、Ca等次要元素以及Na、K、V、Cr、Ni、Co等多种可检测到的微量元素。磁铁矿内元素含量在空间上显示出直观的差异,由深部到浅部,Mn、Zn含量升高,Si、Ca、Na、K、Pb、Ba、Sr、Sb、Cu等含量降低。在Ti O2_Al2O3_Mg O图解、Ti O2_Al2O3_(Mg O+Mn O)图解和Ca+Al+Mn_Ti+V图解上,敦德磁铁矿的分析数据均投影于热液交代(矽卡岩)成因区域。综上认为,该矿床的磁铁矿可能为热液充填交代成因。 |
| 关 键 词： | 地球化学 磁铁矿 LA_ICP_MS 海相火山岩型铁矿 敦德铁矿 西天山 |
| 收稿时间： | 8/8/2014 12:00:00 AM |
| 修稿时间： | 2014/10/12 0:00:00 |
A LA-ICP-MS analysis of elements in magnetite from Dunde iron deposit in Western Tianshan Mountains, Xinjiang: Constraints on genesis of the deposit |
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| DUAN ShiGang,DONG ManHu,ZHANG ZuoHeng,JIANG ZongSheng and LI FengMing.A LA-ICP-MS analysis of elements in magnetite from Dunde iron deposit in Western Tianshan Mountains, Xinjiang: Constraints on genesis of the deposit[J].Mineral Deposits,2014,33(6):1325-1337. | |
| Authors: | DUAN ShiGang DONG ManHu ZHANG ZuoHeng JIANG ZongSheng and LI FengMing |
| Institution: | College of Earth Science and Land Resources, Chang'an University, Xi'an 710054, Shaanxi, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Inner Mongolia Geological Exploration Co., Ltd., Hohhot 010000, Inner Mongolia, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Xinjiang Bureau of Exploration and Development of Geology and Mineral Resources, Urumqi 830000, Xinjiang, China |
| Abstract: | The Dunde iron ore deposit is a newly found and explored marine volcanics-hosted iron deposit in the Tianshan metallogenic belt. Magnetite ore in Dunde can be divided mainly into four types, i.e., disseminated, banded, semi-massive and massive ores. The banded ore consists of two subtypes of magnetite-skarn bands and magnetite-calcite bands. There are a few breccia ores in which wall rock or skarn fragments appear in massive ore, but the magnetite has no genetic difference. Based on field observation and microscopic study, the authors infer that magnetite crystallized at the retrograde stage after the garnet-diopside skarn stage and was replaced by later minerals of sulfide and carbonate stage. There occurred solid solution substitution of Al, Mn, Mg and Zn for Fe within the Dunde magnetite. In addition, the magnetite contains minor elements of Ti, Si and Ca and detectable trace elements of Na, K, V, Cr, Ni, Co, Zr, Pb, Ca, Ba, Sn, Sr, Sb, Cu and Sc. Element values of magnetite show obvious spatial differences of increasing Mn and Zn and decreasing Si, Ca, Na, K, Pb, Ba, Sr, Sb and Cu from the depth upward. Analytical data of Dunde magnetite fall in the region of hydrothermal replacement (skarn) in TiO2-Al2O3-MgO diagram, TiO2-Al2O3-(MgO+MnO) diagram and Ca+ Al+ Mn versus Ti + V diagram. It is concluded that the the Dunde magnetite might be of hydrothermal filling/metasomatic origin, as shown by the above evidence. |
| Keywords: | geochemistry magnetite LA-ICP-MS marine volcanics-hosted iron deposit Dunde iron deposit Western Tianshan Mountains |
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