| 斑岩铜矿浅部富矿岩浆房研究进展 |
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| 引用本文：李万伦.2011.Advances in study of shallow fertile magma chambers below porphyry copper deposits[J].Mineral Deposits,30(1):149~155 |
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| 基金项目:本文得到中国地质调查局地质调查项目“地质调查情报编译与科技成果集成”（编号：1212010561508）的资助 |
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| 中文摘要:在主流的斑岩铜矿模型中，矿床下方都有一个浅部富矿岩浆房，为矿床的最终形成提供成矿流体。国外近年来的大量研究揭示了其基本特征，即位于地表以下约5 km，其大小直接决定着最终矿床的规模，其形态为平卧状，相对封闭，生命周期较短（一般约2 Ma）。岛弧或陆缘弧环境有利于浅部富矿岩浆房形成的条件是中等挤压应力状态或挤压后应力松驰，岩浆来源于深部MASH带（有镁铁质熔体混入），通常形成于长期演化的构造-岩浆旋回的晚期。其成矿作用一般有AFC模式、对流循环模式等。关于大陆内部斑岩铜矿的浅部富矿岩浆房的形成条件尚未见专门研究。今后对不同构造环境下浅部富矿岩浆房如何最终成矿仍需进一步研究。 |
| 中文关键词:地质学 斑岩铜矿 浅部富矿岩浆房 进展 |
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| Advances in study of shallow fertile magma chambers below porphyry copper deposits |
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| Abstract:Major models for porphyry copper deposits hold that there is always a shallow fertile magma chamber below the ore deposits, which provides ore-forming fluid for the formation of the ore deposits. A lot of recent researchesaboard have revealed the characteristics of the chamber: it lies at the depth of about 5 km below the surface, its volume directly controls the size of the ultimate deposit, its shape is flat-lying, it is relatively closed, and its life span is comparatively short (generally about 2 Ma). The favorable conditions for the formation of the shallow fertile magma chamber in island arc or continental arc are the middle compression stress field or the stress relaxing period after compression. The Cu-rich magma originates from the deep MASH zone (often mixed with mafic melt), always generated at the end of a long evolved tectono-magmatism cycle. AFC and the conversion recycling model are often used to indicate possible mineralization-related processes within the magma chamber. So far there has been no study of the formation conditions of the shallow fertile magma chamber generated in the interior of continents. Further endeavors are required to obtain more knowledge about shallow fertile magma chambers as to how to form ores in the final stage under different tectonic environments. |
| keywords:geology, porphyry copper deposits, shallow fertile magma chamber, advances |
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