| 中国镁质碳酸盐岩型温石棉矿床的成矿规律 |
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| 引用本文： | 罗勇.中国镁质碳酸盐岩型温石棉矿床的成矿规律[J].矿床地质,1992,11(3):277-285. |
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| 作者姓名： | 罗勇 |
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| 作者单位： | 四川省地矿局川东南地质大队 重庆 |
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| 摘 要： | 镁质碳酸盐岩型温石棉矿床是成矿热液交代镁质碳酸盐岩生成的,一般均产于地台环境。按地台稳定性不同,成矿环境分为地台隆起区的基底建造类型和地台拗陷区的盖层建造类型。产于地台隆起区的矿床,以前震旦纪镁质碳酸盐岩为控矿层位。产于太古代及早、中元古代深变质结晶基底中的矿床,由区域变质及混合岩化过程中的变质热液交代碳酸盐岩成矿。产于晚元古代浅变质褶皱基底(扬子准地台)中的矿床,以岩浆期后热液或接触交代(湿矽卡岩)热液为成矿热液来源。产于地台拗陷区的矿床,均以震旦纪镁质碳酸盐岩为控矿层位。其成矿时期较晚,一般与拗陷区内岩浆活动同期,由岩浆期后热液或接触交代(湿矽卡岩)热液对镁质碳酸盐岩进行交代成矿。
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| 关 键 词： | 温石棉 镁质 碳酸盐岩型 矿床 成矿 |
Metallogeny Of Magnesian Carbonate Rock Type Chrysotile Asbestos Deposits In China |
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| Abstract: | Magnesian carbonate rock type chrysotile asbestos deposits, formed through the replacement of magnesian carbonate rocks by ore-forming hydrothermal fluids, generally occur in a platform environment. In accordance with the stability of the platform, the metallogenic environment might be divided into basement formation type in platformal uplifted areas and covering formation type in platformal depression areas. Ore deposits in platformal uplifted areas are confined to Presinian magnesian carbonate strata; those in Archean and lower middle Proterozoic hypometamorphie crystalline basement were formed as a result of the replacement of carbonate rocks by metamorphic hydrothermal fluids generated during regional metamorphism and migmatitization; those in upper Proterozoic epimetamorphic folded basement (Yangtze paraplatform) derived their ore-forming fluids from postmagmatic hydrothermal solutions or contact metasomatic wet skarn hydrothermal solutions. Ore deposits in platformal depression areas all have Sinian magnesian carbonate rocks as the host horizon. Formed comparatively late and generally in the same stage as magmatic activity of the depression area, they are products of the replacement of magnesian carbonate rocks by postmagmatic hydrothermal solutions or contact metasomatic wet skarn hydrothermal fluids. |
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