| 鄂东北早元古代沉积变质锰矿元素矿物组合特征 |
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| 引用本文： | 姚敬劬.鄂东北早元古代沉积变质锰矿元素矿物组合特征[J].岩石矿物学杂志,1992,11(3):257-266. |
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| 作者姓名： | 姚敬劬 |
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| 作者单位： | 中南冶金地质研究所 宜昌 |
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| 摘 要： | 鄂东北早元古代沉积变质锰矿是我国时代最古老的锰矿之一,是由早元古代锰质碳酸盐岩经区域变质作用而成,后又经风化富集形成工业矿床。由于特殊的地质构造背景和成矿作用的多阶段性,元素和矿物组合复杂,具有独特性。本文研究了各种组分的演变关系和元素集散因素,为锰质碳酸盐岩在高压绿片岩相区域动力变质及其后表生作用中的演变提供了一个实例。
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| 关 键 词： | 锰矿 元素 矿物 组合 沉积变质 |
Element and Mineral Associations of Early Proterozoic Sedimento-metamorphic Manganese Deposits in Northeastern Hubei |
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| Yao Jingqu Central South Metallurgical-Geological Institute,Yichang.Element and Mineral Associations of Early Proterozoic Sedimento-metamorphic Manganese Deposits in Northeastern Hubei[J].Acta Petrologica Et Mineralogica,1992,11(3):257-266. |
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| Authors: | Yao Jingqu Central South Metallurgical-Geological Institute Yichang |
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| Institution: | Yao Jingqu Central South Metallurgical-Geological Institute,Yichang 443003 |
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| Abstract: | Sedimento-metamorphic manganese deposits within Tiantaishan Forma-tion of Lower Proterozoic Hongan Group in northeastern Hubei are of theoldest manganese deposits in China. Primary ores, consisting of rhodochrosite,kutnohorite, spessartine, jakobsite and bixbyite, were formed by si, Al-bear-ing manganese carbonate sediments through regional high-pressure dynamicmetamorphism in Jinning Period. During the supergene process, primary oreswere converted into oxidized ores comprising todorokite, hollandite, rancieiteand pyrolusite which make up a manganese stain type mineral associa-tion. The formation of the manganese deposits has experienced sedimentary,metamorphic and supergene stages. The sedimentary stage laid. the materialfoundation of these deposits; metamorphism changed the modes of occurren-ce of major elements and, in particular, coarsened the grain size of manga-nese and phosphorous minerals, which benefits the separation of P from Mnin the process of ore dressing: In the supergene process, Mn was furtherenriched, thus raising the grade of manganese ores. |
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| Keywords: | element and mineral association Early Proterozoic sedimento-metamorphic manganese deposit northeastern Hubei |
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