Mountain building at northeastern boundary of Tibetan Plateau and craton reworking at Ordos block from joint inversion of ambient noise tomography and receiver functions

Guo, Zhen1,2; Chen, Yongshun John1,3

2017-04

10.1016/j.epsl.2017.01.026

EARTH AND PLANETARY SCIENCE LETTERS   影响因子和分区

0012-821X

1385-013X

We have obtained a high resolution 3-D crustal and uppermost mantle velocity model of the Ordos block and its surrounding areas by joint inversion of ambient noise tomography and receiver functions using seismic recordings from 320 stations. The resulting model shows wide-spread low velocity zone (Vs <= 3.4km/s) in the mid-to-lowercrust beneath northeastern Tibet Plateau, which may favor crustal ductile flow within the plateau. However, our model argues against the eastward crustal ductile flow beneath the Qinling belt from the Tibetan Plateau. We find high velocities in the middle part of Qinling belt which separate the low velocities in the mid-to-lowercrust of the eastern Qinling belt from the low velocity zone in eastern Tibetan Plateau. More importantly, we observe significant low velocities and thickened lower crust at the Liupanshan thrust belt as the evidence for strong crustal shortening at this boundary between the northeastern Tibetan Plateau and Ordos block. The most important finding of our model is the upper mantle low velocity anomalies surrounding the Ordos block, particularly the one beneath the Trans North China Craton (TNCO) that is penetrating into the southern margin of the Ordos block for similar to 100 km horizontally in the depth range of similar to 70 km and at least 100 km. We propose an on-going lithospheric mantle reworking at the southernmost boundary of the Ordos block due to complicated mantle flow surrounding the Ordos block, that is, the eastward asthenospheric flow from the Tibet Plateau proposed by recent SKS study and mantle upwelling beneath the TNCO from mantle transition zone induced by the stagnant slabs of the subducted Pacific plate. (C) 2017 Elsevier B. V. All rights reserved.

North China Craton TNCO Qinling belt Liupanshan belt lithospheric modification mantle flow

SCI ; EI

英语

NI论文

第一 ; 通讯

NSFC grant in China[91128210]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000395919200022

ELSEVIER SCIENCE BV

20170803374498

Acoustic noise ; Percolation (fluids) ; Tectonics ; Tomography

Geology:481.1 ; Imaging Techniques:746 ; Acoustic Noise:751.4

GEOSCIENCES

Web of Science

1.South Univ Sci & Technol China, Sch Oceanog, Shenzhen, Peoples R China
2.Macquarie Univ, Dept Earth & Planetary Sci, CCFS, GEMOC ARC Natl Key Ctr, Sydney, NSW, Australia
3.Peking Univ, Sch Earth & Space Sci, Inst Theoret & Appl Geophys, Beijing, Peoples R China

Guo, Zhen,Chen, Yongshun John. Mountain building at northeastern boundary of Tibetan Plateau and craton reworking at Ordos block from joint inversion of ambient noise tomography and receiver functions[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,463:232-242.

Guo, Zhen,&Chen, Yongshun John.(2017).Mountain building at northeastern boundary of Tibetan Plateau and craton reworking at Ordos block from joint inversion of ambient noise tomography and receiver functions.EARTH AND PLANETARY SCIENCE LETTERS,463,232-242.

Guo, Zhen,et al."Mountain building at northeastern boundary of Tibetan Plateau and craton reworking at Ordos block from joint inversion of ambient noise tomography and receiver functions".EARTH AND PLANETARY SCIENCE LETTERS 463(2017):232-242.