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矿床地质  2008 

青海南部熔积岩的发现:对寻找VMS型矿床的重要启示

Keywords: 地质学,熔积岩,铁硅质岩,VMS型矿床,开心岭铁矿,沱沱河,青海

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Abstract:

熔积岩指的是侵入、混合到未固结或弱固结的湿沉积物中的熔浆分解、原位形成的一类特殊岩石.正确地认识该类岩石,有利于增进人们对岩浆.水(沉积物)相互作用过程的理解,恢复古环境.在青海南部沱沱河地区发现了一套角砾为撕片状、锯齿状及浑圆状的安山岩,胶结物为铁硅质组合的特殊熔积岩.研究表明,该熔积岩的角砾为岩浆遇水后快速淬火、裂解的产物,铁硅质组合为海底喷气沉积形成的含铁建造;且安山岩与含铁建造发生混合时,含铁建造尚未固结.该套熔积岩的发现,改变了长期以来对开心岭铁矿为火山热液交代安山岩而形成的认识,对于在矿区寻找VMS型矿床、区域内寻找海底热水喷流沉积型矿床具有重要的启示意义.

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