【摘要】 在西昆仑北缘早前寒武纪变质地层中,笔者等识别出大量不同时代的片麻状花岗岩,其中包括新元古代片麻状花岗岩。获得最新的新元古代片麻状花岗岩的单颗粒锆石SHRIMP年龄为815±57Ma,片麻状花岗岩的岩石学特征反映它们形成于裂解构造背景,结合对区域上新元古代地层及中元古代末期构造事件的研究,笔者认为新元古代片麻状花岗岩反映了古塔里木板块作为Rodinia超大陆一员发生裂解的时间,这对研究古塔里木板块在Rodinia超大陆中的位置及中国Rodinia超大陆裂解的研究提供了重要的地质依据。更多还原

【Abstract】 A lot of gneissoid granites were recognized in the early Precambrian metamorphic rocks in the northern West Kunlun, including Neoproterozoic granites. Zircon SHRIMP dating of the Neoproterozoic granites yields an age of 815±57 Ma, and their geochemistry shows that they were formed in a rifting environment. Along with the Neoproterozoic strata and metamorphism at the end of the Mesoproterozoic, the Neoproterozoic gneissoid granites recorded the time of the breakup of the Paleo -Tarim plate, which was a part of Rodinia. This study supplies new and important geological data to locate the Paleo-Tarim plate in Rodinia.更多还原