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攀西古裂谷钠质碱性岩锆石SHRIMPU-Pb年龄及地质意义――以红格、白马和鸡街岩体为例

, PP. 149-154

Keywords: SHRIMPU-Pb,钠质碱性岩,红格、白马和鸡街岩体,四川省和云南省

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Abstract:

用SHRIMP测定攀西古裂谷内钠质碱性岩锆石的U?Pb年龄:红格酸性碱性岩(钠闪石花岗岩)锆石U?Pb年龄为239Ma,白马中性碱性岩(碱长石英正长岩)锆石U?Pb年龄为225Ma和鸡街超基性碱性岩(霞辉岩)锆石U?Pb年龄为204Ma等,其年龄变化范围在239~204Ma,相当于中三叠世―晚三叠世,属于印支期。在成岩时间上显示先酸性、后基性。结合近期对其裂谷作用有关的镁铁―超镁铁层状侵入体和峨眉山玄武岩等定年的结果,暗示其裂谷强烈的张裂时间是在晚二叠世―晚三叠世(259~204Ma)。

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