Early-Stage Lithospheric Foundering Beneath the Eastern Tibetan Plateau Revealed by Full-Wave P-n Tomography

Bao, Xueyang1,2; Shen, Yang1

2020-04-28

10.1029/2019GL086469

GEOPHYSICAL RESEARCH LETTERS   影响因子和分区

0094-8276

1944-8007

The west-east contrast of magmatism in northern Tibet suggests that the lithospheric root has been removed in the west, following continental collision that led to lithospheric thickening and removal, but not in the east where paradoxically larger convergence occurred. Here we show a full-wave P-n tomography model for the eastern Tibetan Plateau, which reveals a high-velocity layer beneath the Moho extending to 150-km depth. The anomalously high velocities and its northward dipping top surface suggest a very depleted and cold mantle consistent with an underthrusted Precambrian Lhasa lithosphere. A high-velocity column connects this layer to another high-velocity layer below 190-km depth, representing early-stage removal of the Tibetan mantle lithosphere and its interaction with the underthrusted Indian lithosphere. The west-east contrast is thus attributed to different stages of lithospheric removal, which may be controlled by varying angles of Indian subduction from the west to the east.

SCI ; EI

英语

通讯

Air Force Research Laboratory[FA9453-16C-0019]

Geology

Geosciences, Multidisciplinary

WOS:000530332600016

AMER GEOPHYSICAL UNION

20201808597727

Velocity

Imaging Techniques:746

GEOSCIENCES

Web of Science

1.Univ Rhode Isl, Grad Sch Oceanog, Narragansett, RI 02882 USA
2.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Bao, Xueyang,Shen, Yang. Early-Stage Lithospheric Foundering Beneath the Eastern Tibetan Plateau Revealed by Full-Wave P-n Tomography[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(8).

Bao, Xueyang,&Shen, Yang.(2020).Early-Stage Lithospheric Foundering Beneath the Eastern Tibetan Plateau Revealed by Full-Wave P-n Tomography.GEOPHYSICAL RESEARCH LETTERS,47(8).

Bao, Xueyang,et al."Early-Stage Lithospheric Foundering Beneath the Eastern Tibetan Plateau Revealed by Full-Wave P-n Tomography".GEOPHYSICAL RESEARCH LETTERS 47.8(2020).