| 滇黔交界地区峨眉山玄武岩铜矿化蚀变特征 |
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| 关键词:native copper bitumen organic matter Emeishan basalt Yunnan-Guizhou border area |
| 基金项目:中国地质调查局地质调查项目(编号:200310200002)，国家重点基础规划发展项目(编号:G1999043211) |
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| Copper Mineralization Characteristics of the Emeishan BasaltDistrict in the Yunnan-Guizhou Border Area |
| Copper mineralization of Emeishan basalt in Yunnan-Guizhou border area shows stratabound character and occurs mainly in the lower part of the Fourth Member of Upper Permian Emeishan Basalt Formation. The host rocks are quenched-shattered amygdaloidal basalts at the tops of the basalt floods and carbonolithintercalations in the basalt floods. Copper minerals mainly include native copper and its oxides such as cuprite, tenorite and malachite together with a littlechalcocite. Gangue minerals comprise mainly bitumen, carbon matter, quartz, zeolite, calcite and epidote. The typical mineral assemblage of the basalts-hostedcopper ore is native copper + bitumen + quartz and that of the carbonoliths-hosted ore is native copper + carbon matter + zeolite + quartz (+ chalcocite). Copper ore-forming process took place probably later than Jurassic and might be divided into two stages: one was earlier than crude oil and the other was later thanbitumen. Folds provided tectonic traps for organic fluids, whereas quenched-shattered amygdaloidal basalts provided space for organic fluids and metallogenic fluids. This type of copper mineralization is somewhat different from the Keweenawbasalt copper deposits. Organic matter played an important role in copper mineralization. |
| LI Hou-min,MAO Jing-wen,XU Zhang-bao,CHEN Yu-chuan,ZHANG Chang-qing,XU Hong.2004.Copper Mineralization Characteristics of the Emeishan BasaltDistrict in the Yunnan-Guizhou Border Area[J].Acta Geoscientica Sinica,25(5):495-502. |
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