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雪峰山黔阳地区基性岩锆石SHRIMPU-Pb年龄及意义

Keywords: 雪峰山,三叠纪,基性-超基性岩,锆石SHRIMPU-Pb年龄

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Abstract:

雪峰山中段基性岩锆石SHRIMPU-Pb测年结果表明雪峰山地区存在多期基性岩。在黔阳(安江)地区发现了的晚三叠世和新元古代的基性岩。在所测的三个不同地区的样品中,发现了一些新太古代-古元古代、中元古代、新元古代以及中生代(印支运动)构造热事件信息,但缺少典型Rodinia超大陆聚合信息。早期的基性岩中锆石成分比较复杂,有很多来自基底的捕获锆石,随着时代的变新,来自基底的信息逐渐减少甚至没有。黔阳地区的基性岩及其时代研究表明:(1)桃江-安化-黔阳-溆浦-靖州断裂是雪峰山的中央断裂,它有多期活动历史,并控制了不同阶段的基性-超基性岩的产出;(2)晚三叠世的基性岩在雪峰山中央断裂左行走滑拉分区域形成,不代表裂谷或碰撞后伸展环境;(3)扬子板块东南缘存在新太古代-古元古代基底。

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