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地质论评  2012 

山西灵丘支家地铅锌银矿隐爆角砾岩筒的岩相分带性研究及其勘查意义

Keywords: 支家地,山西,隐爆角砾岩筒,通道相,铅锌矿床

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Abstract:

隐爆角砾岩筒长期以来一直受到人们的重视,但是对于岩筒的通道相特征以及垂向分带则少有研究。本文通过对山西灵丘支家地铅锌银矿床详细的野外和岩相学研究工作,发现了含矿隐爆角砾岩筒的通道相,其多发育在石英斑岩-石英斑岩角砾岩小岩株的顶部,总体形态为角砾岩筒根部发育的间隔式分支脉状矿化蚀变带,岩体内反映为细脉中心向两侧呈弥散密集浸染状矿化蚀变的隐蔽裂隙脉,对隐爆角砾岩筒的形成机制具有重要的意义。进而根据含矿角砾岩筒不同部位的矿化类型,角砾的成分、形状、大小、可拼合性等特征,将其在垂向上由上而下分为4个相带:①裂隙相、②震碎相、③爆破相、④通道相。各相带的角砾成分、大小、形态、胶结物特征和矿化蚀变等呈规律性变化,震碎相和爆破相是最主要的赋矿部位,沿含矿角砾岩筒的通道相有可能追索到深部的斑岩型矿化。含矿角砾岩筒形成机制与岩浆上侵中第二次沸腾过程中岩浆热液释放有关。

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