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地质论评  2007 

天宝山组形成时代和形成环境――锆石SHRIMPU-Pb年龄和地球化学证据

Keywords: 天宝山组酸性火山岩地球化学特征锆石SHRIMPU-Pb年龄

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Abstract:

川西会理一带出露的天宝山组以酸性火山岩为主,它们的SiO2含量为68.78%~76.96%,K2O含量明显大于Na2O含量,Na2O/K2O比值介于0.01~0.34之间,多属于流纹岩。酸性火山岩的轻重稀土元素分馏程度不高,Eu的负异常明显,Eu/Eu*=0.18~0.35。微量元素中Ba、Ta、Nb、Sr、Ti相对亏损。这些地球化学特征与A型花岗岩相似。酸性火山岩的εNd(t)值介于-5.32到-4.78之间,与地壳衍生的S型花岗岩相似,表明天宝山组酸性火山岩主要来自先存的地壳物质。锆石SHRIMPU-Pb定年结果表明,天宝山组酸性火山岩的形成年龄为1028±9Ma,属于中元古代晚期。

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