云南中旬地区两个斑岩铜矿容矿斑岩的地球化学特征——以雪鸡坪和普朗斑岩铜矿床为例
GEOCHEMICAL CHARACTERISTICS OF PORPHYRY COPPER DEPOSITS IN THE ZHONGDIAN AREA, YUNNAN AS EXEMPLIFIED BY THE XUEJIPING AND PULANG PORPHYRY COPPER DEPOSITS
查看参考文献39篇
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文摘
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位于义敦岛弧南端的中甸岛弧已成为我国又一重要的斑岩铜矿产地，其中雪鸡坪中型斑岩铜矿床产于西斑岩带，普朗超大型斑岩铜矿床产于东斑岩带。详细对比研究了这两个斑岩铜矿床矿床地质，含矿斑岩的岩石化学、地球化学以及年代学等特征，认为：①两者的元素组成非常相似，如稀土配分形式均为轻稀土元素富集型，亏损重稀土元素和Y，富集Sr、K、Rb、Ba、Th等大离子亲石元素，亏损Nb、Ta、Zr、Hf、置等高场强元素，显示了埃达克岩的地球化学特征，表明它们可能是俯冲的甘孜-理塘洋壳部分熔融的产物，并受到地壳物质的混染；②中甸岛弧的结构及时空演化保持了义敦岛弧的共性，发育完整的沟-弧-盆体系，其中东斑岩带属于外弧，而西斑岩带属于内弧，中斑岩带及零星分布的属都蛇绿混杂岩产于弧间盆地。 |
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其他语种文摘
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Recent studies suggest that the Zhongdian Arc, south of the Yidun Island Arc, has become one of our country＇s important producing areas of porphyry copper ores. One of them, the Xuejiping medium-scale porphyry copper deposit, lies in western porphyry belt; and in eastern porphyry belt the Pulang superlarge-scale porphyry copper deposit lies. Detailed comparison and study were made in this paper. The geological characteristics, petro-chemistry, geochemistry and chronology of the two porphyry copper depositsr are dealt with, and the understandings are presented below： （1）The two deposits have very similar elemental compositions, e.g. both are enriched in LREE, depleted in HREE and Y, enriched in LIL dements such as Sr,K,Rb, Ba, Th, etc., depleted in HFS elements such as Nb, Ta, Zr, Hf, Ti, etc. All this indicates that the two deposits are the products of partial melting at Ganzi-Litang and have been contaminated by crustal materials. （2）As the structural and spatial and temporal evolution of the Zhongdian Arc maintain most of the characteristics of the Yidun Island Arc, it has developed as an integrated T-A-BA system. In the system the eastern porphyry belt is situated on the outer arc, the western porphyry belt on the inner arc, and the middle porphyry belt and Shundu ophiolitic mélange with in the interarc basin. |
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来源
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矿物学报
,2007,27(3/4):414-422 【核心库】
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关键词
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岩石地球化学
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斑岩铜矿床
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埃达克岩
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雪鸡坪
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普朗
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中甸弧
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云南
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家973计划
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国家自然科学基金
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文献收藏号
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CSCD:3057107
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