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都兰县巴隆地区的阿此特变基性侵入岩出露于东昆中构造带东段,侵位于中元古界小庙岩组和新元古代花岗质片麻岩中。野外地质、岩石学和地球化学特征显示,阿此特变基性侵入岩为正变质岩,原岩为拉斑质辉长岩。对阿此特变基性侵入岩进行LA-ICP-MS锆石U-Pb同位素年龄测定,获得其形成年龄介于(240.8±2.8)Ma~(241.9±7.3)Ma之间,为中三叠世。锆石特征和地球化学信息显示,锆石具岩浆成因特征,代表阿此特变基性侵入岩的形成年龄。样品中大量捕获锆石反映了东昆仑地区在前寒武纪经历了多期的构造岩浆热事件。
The Arhuite basement intrusive rocks in Barun area, Dulan County, are exposed in the eastern segment of the East Kunqu Middle Structure Belt and invaded in the Miocene Xiaomeimiao Formation and the Neoproterozoic granitic gneiss. Field geology, petrology and geochemical characteristics show that the Akhuite base intrusive rock is a positive metamorphic rock and the original rock is a plagioclase gabbro. LA-ICP-MS zircon U-Pb isotopic ages dating from the Basaltic intrusive rocks were obtained. The age of formation was between (240.8 ± 2.8) Ma and (241.9 ± 7.3) Ma, world. Zircon characteristics and geochemical information show that the zircons are characterized by magmatic origin and represent the age of formation of the Akhertite basement intrusive rock. The large amount of zircons captured in the samples reflects the multistage tectono-thermal events in the Eastern Kunlun area during the Precambrian.