Upper mantle anisotropy analysis around the southern Tarim basin

Xu QiHui1; Ge ZengXi1; Feng YongGe1; Wang GuanZhi1; Guo Zhen2; Liang XiaoFeng3

2021-02-01

10.6038/cjg2021O0153

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION   影响因子和分区

0001-5733

The southern margin of Tarim, the front edge of the collision between the Tarim block and the Qinghai-Tibet Plateau, is an important place for understanding the interaction between the Qinghai-Tibet Plateau and surrounding blocks. The shear wave splitting method can obtain the media anisotropy characteristics of the lithospheric and asthenospheric mantle, and study of the lithosphere deformation and mantle flow. In this paper, we use the shear wave splitting method to analyze the SKS and SKKS phases recorded by eight broadband portable seismic stations jointly deployed by the Institute of Geology and Geophysics of the Chinese Academy of Sciences, Peking University and Southern University of Science and Technology in the southern Tarim Basin, and obtains anisotropy parameters in the upper mantle. The results show that the fast-wave polarization direction in the study area is generally consistent and nearly east-west, but there is a variation from the edge of the basin to the middle of the basin, and the delay time is about 0. 3 to 1. 5 s, and the difference is relatively large. Based on previous studies of shear wave splitting on the northern margin of the Qinghai-Tibet Plateau and around the Altyn Fault, most areas in the study area have the same direction of mantle flow and absolute plate movement. The SEE flow of the marginal asthenosphere disturbs the mantle flow under the Tarim block, and as it enters the Tarim block, the interference becomes weaker and weaker. At the same time, asthenosphere materials in the northern Qinghai-Tibet Plateau may affect the lithosphere of the Tarim Basin. As the mantle material continues to move northward, it gradually cools, and its influence on the inner lithosphere of the basin becomes weaker.

Anisotropy Upper mantle flow Tarim basin Shear wave splitting

SCI ; EI

中文

其他

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000617909800007

SCIENCE PRESS

20210809960973

Anisotropy ; Shear waves

Fluid Flow, General:631.1 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2

GEOSCIENCES

Web of Science

1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China

Xu QiHui,Ge ZengXi,Feng YongGe,et al. Upper mantle anisotropy analysis around the southern Tarim basin[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2021,64(2):471-483.

Xu QiHui,Ge ZengXi,Feng YongGe,Wang GuanZhi,Guo Zhen,&Liang XiaoFeng.(2021).Upper mantle anisotropy analysis around the southern Tarim basin.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,64(2),471-483.

Xu QiHui,et al."Upper mantle anisotropy analysis around the southern Tarim basin".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 64.2(2021):471-483.