| 阮惠础,华仁民,倪培.东川式铜矿的成因再探[J].地质找矿论丛,1988,(1):9-22 |
| 东川式铜矿的成因再探 |
| NEW APPROACHING TO THE GENESIS OF DONGCHUAN TYPE COPPER DEPOSTTS |
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| DOI：10.6053/j.issn.1001-1412.1988.1. 002 |
| 中文关键词: 造叠层石藻类 马尾丝状构造 相关矩阵 |
| 英文关键词: |
| 基金项目: |
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| 中文摘要: |
| 占东川武铜矿储量90%的层状铜矿体,犹如世界许多著名的层状铜矿床的成矿过程一样,并不是同生沉积作用期间简单地直接沉淀富集的。该类型铜矿石的形成,至少经历了铁的硫化物的同生沉积和铜的硫化物的成岩交代两个成矿阶段。 |
| 英文摘要: |
| This study shows that the Dongchuan type copper deposits, like other stratiform copper depositsin the world, were not simply formed by sedimentation during syngenetic deposition. The formation of this type ores had at least undergone two stages, of which the first was syngenetic deposition of pyrite and then the diagenetic replacement of these pyrite to form copper sulfides. The death and putrefaction of algae produced abundant organic materials and anaerobic bacteria, which in turnreacted with sea water sulfates to form syngenetic pyrite. The pyrite was again the important reducing agent for the replacement and precipitation of copper sulfides. According to the fluid inclusion study, the ore-bearing fluid might be a hot brine of 109 to 209℃ containing organic components. Data form isotope study suggest that the ore-formingbrine was composed of mainly interstitial water together with some meteoric water. REE distribution and trace element measurement indicate that copper was mainly from ore-bearing host rock itself.The development of regional deep fractures provided good conditions for the mobilization-transportation of the ore-forming materials in hot brine. A general model of copper mineralization isalso proposed in this paper on the basis of above-mentioned results. |
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