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矿床地质  2002 

论东天山土屋-延东(斑岩)铜矿的容矿岩

Keywords: 岩石学,斑岩铜矿,容矿岩,Na-Si交代,延东-土屋

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Abstract:

通过对土屋_延东(斑岩)铜矿容矿岩的时空分布、物质组分及结构构造研究,认为该矿床的容矿岩是一套由中酸性_基性火山岩(包括沉凝灰岩)经富Na、Si热流体交代而成的钠质酸性_基性火山岩,按岩性及结构分以下4类:①具斑状或似斑状结构的钠质酸性_中酸性火山岩或称之为钠长石英斑岩与石英斑岩,它常位于矿体的上部,约占容矿岩的20%;②以自形、半自形板状、粒状交织结构为主的(含少量斑晶)钠质中酸性_中基性火山岩,或称之为安山玢岩,它常位于矿体的中部及中下部,约占容矿岩的50%;③以自形、半自形板状、粒状交织结构为主的富铝基性火山岩,或称之为高铝玄武岩,它常位于矿体的下部及底板围岩,约占容矿岩的20%;④以凝灰结构、碎屑结构为主的钠质中酸性_中基性火山碎屑岩,它常位于矿体的下部及底板围岩,约占容矿岩的10%。

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