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湘东南宝峰仙地区燕山早期花岗岩地球化学特征及其构造环境

, PP. 206-219

Keywords: 宝峰仙,花岗岩,黑云母Ar/Ar法定年,地球化学特征,后造山环境,湘东南

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Abstract:

湘东南宝峰仙地区发育有3个小规模花岗岩体,均为黑云母二长花岗岩。黑云母40Ar/39Ar法坪年龄为(156.8±1.8)Ma。ISr值为0.71296~0.71347,εNd(t)值为-7.3~-7.2,t2DM为1.54Ga,成岩物质源自中元古代地壳,并有地幔物质的混染。岩石为准铝质,A/CNK=0.98~1.08,平均1.02;富钾和硅,其氧化物平均值分别为5.34%和74.51%;贫Ti、Mg和Ca,其氧化物平均含量分别为0.18%、0.18%和0.98%,属高钾钙碱性系列。具有明显的Ba、Sr、P、Ti负异常和U、Ta、La、Ce、Nd、Sm、Y正异常;富含稀土元素(平均339.14μg/g)。地球化学特征及区域构造演化背景等表明岩石形成于挤压造山向非造山转换的后造山拉张环境。

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