【摘 要】
：
A huge thrust system, the North Lhasa Thrust (NLT), was discovered in the northern Lhasa block of the Amdo-Bam Co profile. The NLT consists of the Dongqiao-Lunp
【机 构】
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Institute of Geomechanics,Chinese Academy of Geological Sciences
【基金项目】
：
This study was supported by the INDEPTH-Ⅲ project of the China Geological Survey and the Ministry of Science and Technology of China
论文部分内容阅读
A huge thrust system, the North Lhasa Thrust (NLT), was discovered in the northern Lhasa block of the Amdo-Bam Co profile. The NLT consists of the Dongqiao-Lunpola thrust (DLT), the west Namco thrust (WNT) and the south Damxung thrust (SDT) and ductile shear zones, ophiolite slices and folds extending in a WNW direction. Major thrust faults of the NLT seem to merge into a single deep-seated detachment of the upper-crust and totally displaced southward as far as 100-120 km. Chronological analyses with 39Ar-40Ar of plagioclase and hornblende, Rb-Sr isochron of minerals and fission-tracks of apatite from mylonite within the WNT yield ages of 174-173 Ma, 109 Ma and 44 Ma,showing 3 periods of thrusting in the north Lhasa block caused by subduction of the Tethys oceanic plate and the IndiaEurasia continental collision respectively.
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