| 印度次大陆中央构造带沉积-变质型锰矿的矿物学和地球化学 |
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| 引用本文： | 杜小伟,杨晓勇,杨钟堂,L.G.Gwalani.印度次大陆中央构造带沉积-变质型锰矿的矿物学和地球化学[J].地质科学,2009,44(1):103-117. |
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| 作者姓名： | 杜小伟 杨晓勇 杨钟堂 L.G.Gwalani |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学学院, 合肥, 230026;
2. 中国地质调查局西安地质矿产研究所, 西安, 710054;
3. C/O The Unique Elect. Corporation, Nagpur 440001, India |
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| 基金项目： | 中国科学院知识创新工程项目 |
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| 摘 要： | 对印度中央构造带sauaar带锰矿及其围岩的31个样品进行了显微镜仔细的观察和鉴定，并分析了其主量元素、微量元素和稀土元素的地球化学特征，发现该带的锰矿主要是软锰矿和硬锰矿，锰矿主要富集在锰榴石英岩内.含锰岩系样品具非常高的Mn/Fe比值，说明热液运输和成矿作用期间锰和铁的强烈分异；MnO/TiO2为67.98-1417.52，说明有大量陆源物质经风化、搬运加入并混合沉积而成.用太古界平均澳大利亚页岩（PAAS）标准化后，稀土元素含量中δEu，δCe都有明显的正异常，说明该带锰矿床是在较强氧化海洋环境和有大量陆源物质加入的条件下沉积，并经过热液的变质交代作用而成的沉积一变质型锰矿床.该沉积-变质型锰矿的发现和研究对我国南方扬子克拉通中元古代浅变质岩系的锰矿寻找具有一定的借鉴意义.
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| 关 键 词： | 沉积-变质型锰矿 锰榴石英岩 REE地球化学 矿物学 印度次大陆中央构造带 |
| 收稿时间： | 2007-10-29 |
| 修稿时间： | 2007-10-29; |
Mineralogy and geochemistry of meta-sedimentary manganese deposits in the Central Indian Tectonic Zone |
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| Du Xiaowei,Yang Xiaoyong,Yang Zhongtang,L.G.Gwalani.Mineralogy and geochemistry of meta-sedimentary manganese deposits in the Central Indian Tectonic Zone[J].Chinese Journal of Geology,2009,44(1):103-117. |
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| Authors: | Du Xiaowei Yang Xiaoyong Yang Zhongtang LGGwalani |
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| Institution: | 1. School of Earth and Space Sciences, University of Science and Technology of China, Hejei 230026;
2. Xi'an Institute of Geology and Mineral Resources, Chiaa Geological Survey, Xi'an 710054;
3. C/O The Unique Elect. Corporation, Naqpur 440001, India |
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| Abstract: | 31 samples of manganese minerals and their country rocks from Sausar belt in the Indian Central Tectonic Zone were observed and identified with microscope, stereoscan and X-ray powder-crystal,and their major and trace elements',and REE's geochemical characters were analyzed by XRD and ICP-MS.The manganese minerals in the belt were mainly pyrolusite and psilomelane,enriched in gondite.In the manganiferous rock series,Mn/Fe was extremely high, resulted from strong fractionation between manganese and iron during hydrothermal transportatlion and metallization.Mn0/Ti02 ratios ranged in 67.98~1417.52,indicating that quantities of terrigenous materials added to the deposition by weathering,transportation and mixing.Normalized to PAAS,both δEu and δCe were obviously positive,suggesting that the manganese deposit was formed by addition of quantities of terrigenous materials in some oxidative marine environment,then experienced hydrothermal metamorphism and metasomatism.The study should be significant for Mn-prospecting in Middle Proterozic meta-sedimentary series in the Yangtze craton. |
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| Keywords: | Meta-sedimentary Mn deposits Gondite REE geochemistry Mineralogy The Indian Central Tectonic Zone |
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