Single-Zircon U-Pb and Geological Significance of Metamorphic and Intrusive System of NALINGELE Region in East Kunlun Neo-proterozoic
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摘要: 在东昆仑那陵格勒河地区发现新元古代变质侵入体，侵位于古元古代金水口岩群及中-新元古代万宝沟岩群中，岩性为花岗闪长质片麻岩和二长花岗质片麻岩。通过对花岗闪长质片麻岩的LA-ICP-MS锆石U-Pb测年，获得岩体形成的年龄为（840±2）Ma。岩石地球化学显示强过铝质-高钾钙碱性系列岩石特征，属S型花岗岩，形成于大陆碰撞造山环境，为同碰撞环境下岩浆作用产物。该岩体与东昆仑地区已报道的新元古代变质侵入岩（体）为同一性质，表明东昆仑地区存在一条新元古代花岗岩深成侵入岩带。整个东昆仑可能曾响应了全球罗迪尼亚超大陆的汇聚事件。Abstract: Neo-proterozoic metamorphic and intrusive rocks(bodies)are discovered in Nalinggelehe area in East Kunlun, which were intruded into Jinshuikou Paleo-proterozic rock group and Wanbaogou Mesoproterozoic-Neoproterozoic rock group, with the lithology of granodioritic gneiss and monzonitic granitic gneiss. The LA-ICP-MS zircon dating of granodioritic gneiss has yielded an age of (840±2)Ma, which belongs to the Neo-proterozoic era.Rock geochemistry shows the characteristics of strong peraluminous, high potassium calc-alkaline series rock, with the features of S type granite, which was formedin continental collision orogenic environment and served as a product of the collision environment.This age and the available dating data suggest that a Meso-to Neo-Proterozoic granitic intrusive belt exists in the eastern margin of the Kunlun block, and that the whole Kunlun block might be a response to the amalgamation event of global Rodinia supercontinent.
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