地质通报2016，Vol.35Issue(4)：572-577,6.
蒙古科布多省阿拉腾索音博地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb dating of gabbro Alatengsuoyinbo, Khovd, Mon-golia, and its geological implications
摘要
Abstract
Alatengsuoyinbo region in Khovd, Mongolia, is located in the southern Altay tectonic zone which possesses a series of arc-basin and accretionary complexes. There is a nearly EW-trending gabbro belt in this region. This paper reports the zircon age of gab⁃bro and its tectonic environment.15 grains of gabbro zircon are assigned to two categories: one type of zircons has obvious band rhythm and the other type of zircons is uniform and clean without inclusion. In consideration of the high Th/U ratios ( 0.46~0.68), it is thought that they are typical basic magmatic zircons. 15 zircons yielded a weighted mean 206Pb/238U age of 317.6±1.6Ma. The gab⁃bro was formed during Late Carboniferous. The research shows that the gabbro was formed at the end stage of the plate subduction and collision, being the product of mafic magmatic activities under the background of Altay orogeny.关键词
辉长岩/LA-ICP-MS锆石U-Pb年龄/弧盆系/阿尔泰/蒙古Key words
gabbro/LA-ICP-MS zircon U-Pb ages/arc-basin/Altay/Mongolia分类
天文与地球科学引用本文复制引用
付超,李俊建,唐文龙,党智财,Orolmaa Demberel..蒙古科布多省阿拉腾索音博地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2016,35(4):572-577,6.基金项目
中国地质调查局项目（编号1212010561510、1212010811061、1212011120330、12120114001201、1212010781028、1212011085488）、国土资源公益性行业科研专项（编号200811010）和国家国际科技合作项目 （）
