| 康滇地轴中段前震旦系马鞍山组的发现及特征 |
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| 引用本文： | 李忠雄,周铭魁,张开国,李国清.康滇地轴中段前震旦系马鞍山组的发现及特征[J].沉积与特提斯地质,2001,21(1):63-77. |
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| 作者姓名： | 李忠雄 周铭魁 张开国 李国清 |
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| 作者单位： | 1. 成都地质矿产研究所,
2. 四川地勘局404地质队, |
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| 摘 要： | 四川会东县“马鞍山组”的发现，是近年来康滇地轴中段前震旦系地质研究的重要进展，对提高基础地质研究，进一步寻找会理拉拉式铜矿具有重要意义。“马鞍山组”的剖面特征和岩石学研究表明，该组相于古元古界河口群，岩性组合主要为海相喷发的钠质火山岩－细碧岩组合，蚀变强烈；火山岩岩石化学特征表现为富钠、贫钾，高钙、低铁，岩性偏中酸性，火山岩属碱性玄武岩系列。微量元素以Cu-Au-U-Zn-As-Sb-Fe-Cr-Co组合为特征。岩石的稀土总量低，轻重稀土比值大，为轻稀土富集型，具有等铕亏损和微弱铈亏损；其配分模式图呈向右倾斜的“V”字型。
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| 关 键 词： | 前震旦系 岩石特征 地球化学特征 马鞍山组 火山岩 |
| 文章编号： | 1009-3850(2000)01-0063-15 |
| 收稿时间： | 2000/9/4 0:00:00 |
| 修稿时间： | 2000年9月4日 |
The discovery and significance of the Presinian Ma'anshan Formation in the central part of the Kang-Dian Axis, southwestern China |
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| LI Zhong-xiong,ZHOU Ming-kui,ZHANG Kai-guo,LI Guo-qing.The discovery and significance of the Presinian Ma''anshan Formation in the central part of the Kang-Dian Axis, southwestern China[J].Sedimentary Geology and Tethyan Geology,2001,21(1):63-77. |
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| Authors: | LI Zhong-xiong ZHOU Ming-kui ZHANG Kai-guo LI Guo-qing |
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| Institution: | LI Zhong xiong 1,?ZHOU Ming kui 1,?ZHANG Kai guo 2,?LI Guo qing 2 |
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| Abstract: | The discovery of the Presinian Maanshan Formation in the Huidong region, Sichuan marks an important progress in the research on the Presinian strata in the central part of the Kang-Dian Axis, especially in the prospecting and exploration of the Lala-type copper deposits in Huili, Sichuan. The Maanshan Formation consists of a suite of metamorphic sodic volcanic rocks-spilite associations, and may be correlated with the Palaeoproterozoic Hekou Group in Huili, Sichuan and Xiaoliukou Formation in Dongchuan, Yunnan. The volcanic rocks in the Formation that are assigned to the alkaline basalt series are characterized by: (1)higher contents of sodium and calcium and lower contents of potassium and iron; (2)REE association Cu-Au-U-Zn-As-Sb-Fe-Cr-Co;(3)relatively low Σ REE and relatively high LREE/HREE ratios indicating a LREE-enriched type of the rocks; (4)Eu and Ce depletion and a slightly rightward-dipping V-type distribution pattern. |
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| Keywords: | Presinian lithology geochemistry |
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