内蒙古温其根乌兰蛇绿混杂岩中枕状玄武岩特征及锆石U-Pb年龄
Geological bulletin of China(2015)
Abstract
内蒙古温其根乌兰蛇绿混杂岩是内蒙古索伦山-苏左旗-锡林浩特蛇绿岩带的西段部分,岩石组合包括枕状玄武岩、蛇纹岩、菱镁岩、硅质岩、浅变质粉砂质碎屑岩、碳酸盐岩等,岩石呈大小不等的构造岩块产出.枕状玄武岩具高Na2O、低K2O,富集Th、Ta、Nb,亏损K、Sr、Rb、Yb等元素,∑REE含量低,δEu=1.22~1.28,显示正Eu异常等大洋中脊玄武岩特征.LA-MC-ICP-MS锆石U-Pb年龄为475.8±1.6Ma,为研究华北板块北缘的大地构造演化提供了新的证据.
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Tectonics
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