滇—黔边境鲁甸沿河铜矿床的发现与峨眉山大火成岩省找矿新思路

doi:10.11867/j.issn.1001-8166.2002.06.0912

地球科学进展 ›› 2002, Vol. 17 ›› Issue (6): 912 -917. doi: 10.11867/j.issn.1001-8166.2002.06.0912

朱炳泉 ¹，常向阳 ^1,2，胡耀国 ¹，张正伟 ¹

1.中国科学院广州地球化学研究所，广东广州 510640；2. 广州大学环境科学系，广东广州 510405

收稿日期:2002-08-21 修回日期:2002-10-07 出版日期:2002-12-20
通讯作者: 朱炳泉（1940-），男，浙江长兴县人，研究员，主要从事同位素地球化学等方面的研究工作.E-mail：bqzhu@gig.ac.cn E-mail:bqzhu@gig.ac.cn
基金资助:
国家重点基础研究发展规划项目“大规模成矿作用及大型矿集区预测”（编号：G19990432）；国家攀登计划预选项目“与寻找超大型矿床有关的基础研究”（编号：PD-Y-25）；中国科学院资源与生态环境研究项目“华南地球化学急变带的形成机制及其与板块构造的耦合关系”（编号：KZ951-B1-413）；国家自然科学基金项目“滇东南多块体拼合带多元同位素体系示踪与成矿作用研究”（编号：40073001）等联合资助.

DISCOVERY OF YANHE COPPER DEPOSIT IN THE YUNNAN-GUIZHOU BORDER AREA AND A NEW TRAIN OF THOUGHT FOR COPPER PROSPECTING IN THE LARGE IGNEOUS PROVINCE OF EMEISHAN FLOOD BASALTS

ZHU Bing-quan ¹, CHANG Xiang-yang ^1,2, HU Yao-guo ¹, ZHANG Zheng-wei ¹

1.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 2.Department of Environmental Science, Guangzhou University, Guangzhou 510405, China

Received:2002-08-21 Revised:2002-10-07 Online:2002-12-20 Published:2002-12-01

滇-黔边境鲁甸沿河铜矿床矿化受二叠纪玄武岩最上部古火山口相角砾凝灰岩-气孔状熔岩和上覆宣威组碳泥质层控制。矿石矿物主要为自然铜、氧化铜与辉铜矿。自然铜呈板片状、网脉状、浸染状产出。矿化与阳起石化、沥青化、硅化和沸石化密切相关。在峨眉山大火成岩省寻找沿河式铜矿应关注以下重要问题：①地球化学急变带所确定的岩石圈不连续界面控制了峨眉山玄武岩裂隙式喷发；②古火山口相从苦橄质到安山质高分异岩浆喷发；③火山口环境联系下的贫硫、贫酸根同生热液活动；④富有机质地层中有机-无机相互作用所产生的强还原性环境；⑤脆韧性断裂带的发育导致矿体的进一步富化。

关键词: 地球化学急变带, 峨眉山玄武岩古火山口, 自然铜-氧化铜矿床, 有机—无机相互作用

Copper mineralization of the Yanhe deposit in Ludian county near the border area between Yunnan and Guizhou provinces is related to the strata of tuff breccia, and vesicular lava-ignimbrite beds in the ancient volcanic vents of the Emeishan flood basalts, as well as the Xuanwei Formation of Upper Permian composed of carbonaceous argillites and siliceous rocks. Ore minerals are manly native coppers, copper oxides, chalcocites and chalcopyrites. The native coppers shows occurrence in slab-flaky, net veined and impregnated. Copper mineralization is tightly associated with zeolitization, actinolite-tremolitization, bituminization and silicatization. These features are quite similar to those of the copper deposits in Keweenaw Peninsula, Michigan, USA. The key points for searching copper deposits with features of the Yanhe style in the large igneous province of the Emeishan basalts are:①discontinuous faces of lithosphere identified by geochemical steep zones of NW strike controlled rifting eruptions of the Emeishan basalts. ②magma eruptions with high fractionation from picritic to andesitic in magma chambers of vents.③synvolcanic hydrothermal activation depleted in sulfur and acid radicals in volcanic vent environments caused copper mineralization on large scale.④organic-inorganic interaction within strata enriched in organic matter provided strong reduction environments for native copper formation.⑤brittle-tough faulting induced progressive copper enrichment in ores.

Key words: Ancient volcanic vents of the Emeishan flood basalts, Native copper-copper oxide deposit, Organic-inorganic interaction., Geochemical steep zones

中图分类号:

P618.41

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