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地质学报  2006 

江西德兴泗洲辉绿岩体锆石La-ICP-MS定年及其地质意义

, PP. 1017-1025

Keywords: La-ICP-MS,U-Pb定年,锆石,辉绿岩,德兴泗洲,赣东北

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Abstract:

本文应用La-ICP-MS锆石U-Pb原位定年方法,对赣东北德兴县泗洲辉绿岩体锆石作了精确测定,获得年龄为838.5±5.3Ma。同时对区内若干基性岩体作了主量元素、微量及稀土元素含量等分析测试研究。在综合归纳区域内前寒武纪岩浆活动产物形成年龄及地球化学特征的基础上,将赣东北及邻区前寒武纪岩浆活动主要分成两期三个阶段,即1150~1000Ma的洋壳发育阶段、1000~900Ma的洋壳俯冲阶段和840~800Ma的碰撞挤压阶段。提出在Rodinia超大陆裂解时期扬子西缘和东缘处于不同构造动力学环境的认识。泗洲辉绿岩体年龄的确定为赣东北地区大地构造演化研究提供了新的证据。

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