攀西地区铅锌成矿地质背景——兼论峨眉山玄武岩与铅锌成矿作用

攀西成矿带具有独特的大地构造位置、复杂的地质演化和丰富的矿产资源。前人工作已基本查明了区内铅锌成矿地质背景，但关于峨眉山玄武岩与铅锌成矿作用之间的关系，仍有较多认识分歧。笔者通过综合分析前人在地质、地球化学、矿产资源等方面的研究成果，认为与成矿有关的是峨眉山玄武岩之后的印支晚期和燕山期的两次相对较弱的构造岩浆侵入作用，峨眉山玄武岩本身不提供成矿物质、流体和热动力，但其形成厚大的盖层空间使其后期成矿流体均得以保存下来富集成矿，具有重大贡献。提出该区铅锌找矿的三条件：目前（或曾经）被峨眉山玄武岩覆盖、地层为前二叠系碳酸盐岩、后期（印支晚期-燕山期）构造发育。

Geological background for lead-zinc mineralization in the Panxi area and its relationship with the Emeishan basalt.

The Panxi metallogenic belt is well known for its unique tectonic setting, complex geological evolution and rich mineral resources. Previous work has clarified its geological background for lead-zinc mineralization, while its relationship with the Emei Shan basalt remains a controversial issue. Through a literature survey covering geology, geochemistry, and mineral resources, we consider that the mineralization is related with two relatively weak tectonic-magmatic intrusions which occurred after the Emei Shan basalt activity in the late Indosinian and Yanshanian periods. The Emei Shan basalt itself did not provide mineralization minerals, fluid and thermal power, instead leaving a big cap space for the later ore-forming fluids. Three conditions can perhaps contribute to the lead-zinc ore prospecting in the Panxi area:1) being covered by the Emei Shan basalt, 2) pre-Permian carbonate rocks, and 3) the development of the later (late Indosinian-Yanshanian) structures.