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地质通报  2010 

内蒙古锡林浩特地区拜仁达坝矿区闪长岩体锆石SHRIMPU-Pb定年及其地质意义

, PP. 688-696

Keywords: 内蒙古中东部,拜仁达坝闪长岩体,锆石SHRIMPU-Pb定年,火山弧

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Abstract:

对拜仁达坝矿区闪长岩体中的锆石进行了SHRIMPU-Pb定年,获得13个锆石颗粒的206Pb/238U年龄的加权平均值326.5Ma±1.6Ma(MSWD=1.7),表明岩体侵位于海西期。岩体的地球化学特征显示岩体较为明显地受到了锡林浩特杂岩的混染,具有火山弧岩浆作用成因的特点。结合区域内其他海西期岩体的年代学和地球化学特征,该区海西期经历了一次较为强烈的构造岩浆事件,也暗示该火山弧环境可能从苏尼特地区一直向东延伸至克什克腾旗的北部地区。

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