摘要
青海南山东段花岗岩类岩石类型为二长花岗岩、花岗闪长岩及英云闪长岩。通过高精度LA-ICP-MS锆石U-Pb同位素测年,获得二长花岗岩、花岗闪长岩的年龄分别为241±3Ma、245±2Ma和249±3Ma,可代表其成岩年龄。花岗岩类构造环境判别图显示,岩石具俯冲型花岗岩类特征,可能代表早三叠世宗务隆洋的北向俯冲过程。通过对青海南山东段侵入岩体形成时代、岩石成因、构造环境等的研究,为青海宗务隆造山带在印支期的构造环境演化和动力学机制提供了重要的依据。
The granitic plutons in the eastern section of Nanshan within Qinghai Province consist of monzogranite, granodiorite and tonalite. The zircon U-Pb dating results of monzogranite and granodiorite are 241±3Ma, 245±3Ma and 249±3Ma respectively, representing the crystallization age of those granitoids. In tectonic discrimination diagram for granitic rocks, these samples fall in the subduction field, indicating the north subduction of the Zongwulong oceanic crust in Early Triassic. Through the research on petrogenesis, ages and tectonic setting for granitic plutons in the eastern section of Nanshan within Qinghai Province along Zongwulong belt, this paper provides important evidence for the tectonic environment and geodynamic mechanism of the Zongwulong belt in Early Triassic.
作者
李生虎
强晓农
田滔
赵立志
徐世来
马强
LI Shenghu;QIANG Xiaonong;TIAN Tao;ZHAO Lizhi;XU Shilai;MA Qiang(No.5 Geological and Mineral Survey Institute of Qinghai Province,Xi＇ning 810099,Qinghai,China)
出处
《地质通报》
CAS
CSCD
北大核心
2018年第7期1236-1245,共10页
Geological Bulletin of China
基金
中国地质调查局项目<青海省共和县东巴地区三幅1:5万区域地质矿产调查>(编号:12120113033020)
关键词
青海南山东段
花岗岩类
早三叠世
LA-ICP-MS锆石U-PB测年
构造环境
the eastern section of Nanshan within Qinghai Province
granitic plutons
Early Triassic
LA-ICP-Ms zircon U-Pb dat-ing
tectonic setting
