| 云南省中部富碱斑岩成矿机理探讨 |
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| 引用本文： | 赖健清,彭省临.云南省中部富碱斑岩成矿机理探讨[J].大地构造与成矿学,1997,21(4):362-368. |
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| 作者姓名： | 赖健清 彭省临 |
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| 作者单位： | 中南工业大学地质系 |
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| 摘 要： | 云南富碱斑岩由地壳深部的源岩分离熔融形成，该源岩则由早期侵入陆壳的幔源超基性岩与陆壳组分混合而成。斑岩成矿作用的成矿物质主要来源于岩浆，铅同位素资料表明它们有深部流体相、早期陆壳和幔源岩浆三种来源，但归根结底可能本区存在异常上地幔。地质地球化学综合分析认为，铜金等元素主要来源于幔源组分，铅锌等元素来源于陆壳组分，源岩重熔和岩浆演化使成矿元素得到进一步的富集。在不同的构造单元中，源岩的壳幔组分比、重熔程度等存在差异，因而富碱斑岩特征及成矿作用有别，出现两个成矿亚系列。
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| 关 键 词： | 成矿机理 成矿模式 源岩 富碱斑岩 云南 |
ON THE METALLOGENETIC MECHANISM OF THE ALKALI-RICH PORPHYRIES IN CENTRAL YUNNAN |
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| Abstract: | The alkali-rich porphyries in Yunnan formed by separated melting of the source-rock inthe depth of the crust that consisted of crustal material and mantle-source ultrabasic rocksintruded into continental crust before. The source for the metallogenesis related to theporphyries was mainly magma, which included fluid phase from the depth, crust- andmantlesource showed by lead isotopic data,and maybe inferred there was an abnormal upper-mantlein this district. Multidisciplinary analysis of geology and geochemistry indicates that copperand gold were mantle originated,lead and zinc were continental crust originated, and theywere further enriched by source-rock remelting and magmatic evolution. Among all thetectonic units, there are two metallogenetic subserials related to different alkali-rich porphyryfeatures and metallogenesis resulting from different crust/mantle ratio and remelting fractionof the source-rock. |
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| Keywords: | metallogenetic mechanism metallogenetic pattern source-rock alkalirich porphyry Yunnan |
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