| 湖南车江铜矿的成因及成矿模式 |
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| 引用本文：.1997.Genesis and Metallogenic Model of the Chejiang Copper Deposit, Hunan Province[J].Mineral Deposits,16(3):244~253 |
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| 基金项目:中国科学院资助重点课题部分成果 |
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| 中文摘要:对湖南衡阳盆地的车江铜矿进行了较为深入的研究。研究结果表明，车江铜矿是一种低温沉积型铜矿，其成因与有机质密切相关，经历了沉积富集、成岩富集和表生富集三个阶段。 |
| 中文关键词:铜矿 有机质 红色建造 矿床成因 成矿模式 车江 |
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| Genesis and Metallogenic Model of the Chejiang Copper Deposit, Hunan Province |
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| Abstract:The Chejiang deposit is located in Hengyang basin, Hunan Province, and the copper deposit is lithologically divisible evidently into two types: cupreous mudstone and cupreous sandstone, both containing a great deal of organic matter. Studies indicate that organic carbon in the copper deposit ranges from 0.2% to 11.74% whereas organic detritus from 4.82% to 21.08%. Copper content and copper minerals have positive correlation with organic carbon and organic detritus. It is observed under microscope that copper minerals are invariably associated with organic detritus, suggesting the genetic connection between the copper deposit and organic matter. The δ34S values in the range of -19.02‰～-39.31‰ show features of biogenic and/or sedimentary origin, Co/Ni ratios of the copper deposit range from 0.43 to 1.84 (0.94 0n the average), implying features of sedimentary origin. The colitic mudstone-type copper deposit shows enrichment of uranium anomaly, and the maximum uranium content is as high as 842×10-6, reaching the grade of a poor uranium deposit. The reflectance of the organic matter from the Chejiang copper deposit ranges from 0.601‰ to 0.642‰. On the basis of Bostick's graphic interpretation, the ore-forming temperature is estimated to be between 81℃ and 95℃, quite consistent with the temperature (93℃) obtained from the ore microscopy analysis. This suggests that the Chejiang copper deposit was formed at low temperature. A multidisciplinary analysis indicates that the Chejiang copper deposit is a low-temperature sedimentary type deposit which underwent sedimentation diagenetic enrichment and supergene enrichment. |
| keywords:copper deposit, organic matter, red formation, genesis of ore deposit, metallogenic model, Dongjiang |
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