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桂东南南渡正长岩年代学、地球化学特征及其构造意义

, PP. 284-293

Keywords: 南渡正长岩,元素地球化学,LA?ICP?MS锆石U?Pb年代学,桂东南

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Abstract:

桂东南南渡正长岩的LA?ICP?MS锆石U?Pb年代学测试表明,该正长岩形成年龄为162±1Ma,和赣南全南及桂东南地区其他燕山早期正长岩形成年龄一致。该正长岩SiO2=61.78%~63.39%,具有高碱(K2O+Na2O=11.18%~12.30%)、高K2O含量(6.47%~9.06%)和K2O/Na2O值(1.37~2.80)特征,系钾玄质系列岩石。该正长岩富集轻稀土元素(LREE)和大离子亲石元素(LILE)、Eu负异常(δEu=0.48~0.74)、Sr和P?Ti负异常明显、无明显Nb?Ta异常、εNd(t)=+0.32~+0.84,被归为大陆板内钾玄质岩石,代表了燕山早期160Ma左右华南内部一次重要的伸展-裂谷事件。

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