内蒙古东乌旗盐池北山花岗岩年代学特征及地质意义
Coal Geology of China(2017)
Abstract
盐池北山碱长花岗岩岩体位于白音乌拉-东乌旗岩浆岩带与燕山期大兴安岭岩浆岩带的叠加部位,岩体内存在结构演化序列.本次采用LA-ICP-MS锆石U-Pb法对3件碱长花岗岩样品进行了年代学研究,测定岩体成岩年龄为283.5 ± 2.1Ma、277.6 ± 2.5Ma和298.7 ± 2.3Ma,属早二叠世.地球化学显示,该岩体具高硅、高碱、低铝、低铁镁钙、高钾钙碱性特征.岩石具有较高的稀土元素总量,∑REE为(200.56~316.70) ×10 -6,平均含量为252.52 ×10 -6,∑LREE为(183.60 ~275.01) ×10 -6,∑HREE=(16.95 ~41.69) ×10 -6.岩石 ω(LREE)/ω(HREE)为6.10~10.83,总体表现为轻稀土中等富集的右倾V字配分形式.微量元素结果表明盐池北山碱长花岗岩可能为造山后伸展体制下岩浆作用的产物,标志着兴蒙造山带晚古生代构造演化处于后造山构造阶段.
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