摘要
巴龙贡噶尔组是广泛分布于南祁连地区的古生代地层,通过区域地层对比研究,将祁连山西段当金山一带原巴龙贡噶尔组中的变质岩系厘定命名为拐杖山岩群(Pt2-3G.),LA-ICP-MS锆石U-Pb年龄显示该地层形成于1662.8±5.7~962.9±4.4Ma的中新元古代。区域构造分析认为,南祁连地区前寒武纪变质基底岩石很可能是古老的柴达木地块的基底组分,是南祁连向南逆冲推覆于柴达木地块上的大型构造窗。
Balonggongge'er Formation is a Paleozoic stratigraphic unit distributed in southern Qilian Mountain. The authors disintegrated a typical schist unit in Balonggongge'er Formation which is located in West Qilian Mountain and named Guaizhangshan Complex-Group. LA-ICP-MS zircon U-Pb geochronology reveals 3 age spans, i.e., 2540±5Ma, 1662.8±5.7Ma and 962.9±4.4Ma respectively. Regional structural analysis shows that the Precambrian metamorphic basement rocks in southern Qilian Mountain was probably the basal components of ancient Qaidam massif, and was the tectonic window of Qaidam massif which was thrust southward and lay over southern Qilian Mountain through napping.
作者
王军
孙新春
李小强
梁明宏
王玉玺
任文秀
WANG Jun;SUN Xinchun;LI Xiaoqing;LIANG Minghong;WANG Yuxi;REN Wenxiu(Geological Survey of Gansu Province,Lanzhou 730000,Gansu,China;Key Laboratory of Western China's Environmental Systems,Ministry of Education/College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China;Key Laboratory of Mineral Resources in Western China (Gansu Province), School of Earth Sciences,Lanzhou University, Lanzhou 730000, Gansu, China)
出处
《地质通报》
CAS
CSCD
北大核心
2019年第7期1116-1126,共11页
Geological Bulletin of China
基金
中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》(编号:DD20160012)
关键词
祁连山西段
巴龙贡噶尔组
拐杖山岩群
逆冲推覆
构造窗
West Qilian Mountain
Balonggongge'er Formation
Guaizhangshan Complex- Group
thrust - nappe structures
tectonic window
