How and How Much Did Western Central Tibet Raise by India-Asia Collision?

被引:14
作者
Zeng, Yun-Chuan [1 ,2 ]
Xu, Ji-Feng [1 ,2 ]
Chen, Jian-Lin [3 ,4 ]
Wang, Bao-Di [5 ,6 ]
Huang, Feng [1 ,2 ]
机构
[1] China Univ Geosci, Sch Earth Sci & Resources, Beijing, Peoples R China
[2] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing, Peoples R China
[3] Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou, Peoples R China
[4] Chinese Acad Sci, CAS Ctr Excellence Deep Earth Sci, Guangzhou Inst Geochem, Guangzhou, Peoples R China
[5] China Aero Geophys Survey, Beijing, Peoples R China
[6] Remote Sensing Ctr Natl Resources, Beijing, Peoples R China
关键词
Tibetan Plateau; Paleo-crustal thickness; zircon; Indian underthrusting; adakite; lower continental crust; TECTONIC EVOLUTION; QIANGTANG TERRANE; AREA; PLATEAU; BENEATH; GEOCHRONOLOGY; GEOCHEMISTRY; SUBDUCTION; MAGMATISM; ORIGIN;
D O I
10.1029/2022GL101206
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
This study uses geochemical mohometers to investigate the paleo-crustal thickness and elevation of western Tibet through the Cretaceous to Eocene. The northern Lhasa Block and southern Qiangtang Block (QB) had a similar paleo-crustal thickness of similar to 55 km during the Late Cretaceous, but the latter had reached its present-day thickness (similar to 70 km) and elevation (similar to 5.5 km) by the mid-Eocene, which was not caused by underthrusting of Indian crust according to isotopic evidence. Our study demonstrates the western and central QB shared a similar early Paleogene tectonomagmatic evolution with the formation of a continues proto-plateau in central Tibet, resulting from crustal shortening and subsequent lithospheric foundering. This in turn implies underthrusting of the Indian lithosphere beneath the western QB after Eocene, given the present-day lithospheric difference between the western and central QB. Our reconstruction of paleo-crustal thickness and elevation, however, suggests the Indian underthrusting caused minimal further crustal thickening and uplift.
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页数:10
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