地质通报2017，Vol.36Issue(9)：1562-1568,7.
东昆仑南缘布青山地区得力斯坦花岗闪长岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb dating of granodiorite from Delisi-tan of the Buqingshan area, southern margin of East Kunlun Mountains, and its geological implications
摘要
Abstract
The Buqingshan tectonic mélange, which is an important tectonic boundary on the southern margin of East Kunlun Mountains, is located in the northeast of the Tibetan Plateau. In this area, tectonic movement is active and Early Paleozoic-Late Pa-leozoic intermediate-acidic intrusive rocks are well developed. With high-precision geochronologic analysis, LA-ICP-MS zircon U-Pb dating was conducted for zircons from Delisitan granodiorite and, as a result, the 206Pb/238U weighted average age of 414.3± 1.8Ma was obtained, which implies that the Delisitan granodiorite was formed in Late Silurian-Early Devonian period. Summary of previous researches shows that the granodiorite was the product of partial melting of the subducting oceanic crust, and this means that the Proto-Tethys oceanic crust of Buqingshan area was subducted northward from Cambrian until Late Silurian-Early Devonian. These results provide a new constraint for the study of tectonic evolution in the East Kunlun area.关键词
锆石U-Pb年龄/花岗闪长岩/原特提斯洋/布青山构造混杂岩Key words
zircon U-Pb age/granodiorite/Proto-Tethys Ocean/Buqingshan tectonic mélange分类
天文与地球科学引用本文复制引用
邵东,计文化,李荣社,陈守建,李猛,王刚,赵如意..东昆仑南缘布青山地区得力斯坦花岗闪长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(9):1562-1568,7.基金项目
中国地质调查局项目《东昆仑关键地区区域地质调查》(编号:12120113028800)、《秦-祁-昆重要结合带区域地质专项调查》(编号:1212011121258)和中国核工业地质局项目《甘肃省龙首山成矿带铀矿资源调查评价与勘查》(编号:201619) （编号:12120113028800）
