Tibetan basement rocks near Amdo reveal "missing" Mesozoic tectonism along the Bangong suture, central Tibet

被引:428
作者
Guynn, Jerome H. [1 ]
Kapp, Paul
Pullen, Alex
Heizier, Matthew
Gehrels, George
Ding, Lin
机构
[1] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
[2] New Mexico Inst Min & Technol, New Mexico Bur Geol & Mineral Resources, Socorro, NM 87801 USA
[3] Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100029, Peoples R China
[4] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
关键词
Tibet; Bangong Suture; terrane accretion; continental arcs; continental collision;
D O I
10.1130/G22453.1
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The U-Pb and Ar-40/Ar-31 studies of a unique exposure of crystalline basement along the Jurassic-Early Cretaceous Bangong suture of central Tibet reveal previously unrecognized records of Mesozoic metamorphism, magmatism, and exhumation. The basement includes Cambrian and older orthogneisses that underwent amphibolite facies metamorphism coeval with extensive granitoid emplacement at 185-170 Ma. The basement cooled to similar to 300 degrees C by 165 Ma and was exhumed to upper crustal levels in the hanging wall of a south-directed thrust system during Early Cretaceous time. We attribute Jurassic metamorphism and magmatism to the development of a continental arc during Bangong Ocean subduction, and Early Cretaceous exhumation to northward continental underthrusting of the Lhasa terrane beneath the Qiangtang terrane. We speculate that a Jurassic arc extended regionally along the length of the Bangong suture, but in all other places in Tibet has been buried, either depositionally or structurally, beneath supracrustal assemblages.
引用
收藏
页码:505 / 508
页数:4
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