气候变化领域集成服务门户(CCPortal): Moho depth inversion in the Tibetan Plateau from high-precision gravity data

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DOI	10.26464/epp2023041
	Moho depth inversion in the Tibetan Plateau from high-precision gravity data
	He, HuiYou; Fang, Jian; Sun, HePing; Guo, DongMei; Xue, ZhiXin; Hou, Jing
发表日期	2023
ISSN	2096-3955
起始页码	487
结束页码	498
卷号	7 期号:4
英文摘要	The Tibetan Plateau (TP) is the youngest orogenic belt resulting from a continental collision on the Earth. It is a natural laboratory for studying continental dynamics, such as continental convergence, plate subduction, and plateau uplift. Investigating the deep structure of the TP has always been a popular issue in geological research. The Moho is the boundary between the crust and the mantle and therefore plays a crucial role in the Earth's structure. Parameters such as depth and lateral variation, as well as the fine structure of the crust-mantle interface, reveal the lithospheric dynamics in the TP. Two methods are generally employed to study the Moho surface: seismic detection and gravity inversion. Seismic detection has the characteristic of high precision, but it is limited to a few cross-sectional lines and is quite costly. It is not suitable for and cannot be carried out over a large area of the TP. The Moho depth over a large area can be obtained through gravity inversion, but this method is affected by the nature of gravity data, and the accuracy of the inversion method is lower than that of seismic detection. In this work, a high-precision gravity field model was selected. The Parker-Oldenburg interface inversion method was used, within the constraints of seismic observations, and the Bott iteration method was introduced to enhance the inversion efficiency. The Moho depth in the TP was obtained with high precision, consistent with the seismic detection results. The research results showed that the shape of the Moho in the TP is complex and the variation range is large, reaching 60-80 km. In contrast with the adjacent area, a clear zone of sharp variation appears at the edge of the plateau. In the interior of the TP, the buried depth of the Moho is characterized by two depressions and two uplifts. To the south of the Yarlung Zangbo River, the Moho inclines to the north, and to the north, the Moho depresses downward, which was interpreted as the Indian plate subducting to the north below Tibet. The Moho depression on the north side of the Qiangtang block, reaching 72 km deep, may be a result of the southward subduction of the lithosphere. The Moho uplift of the Qiangtang block has the same strike as the Bangong-Nujiang suture zone, which may indicate that the area is compensated by a low-density and low-velocity mantle.
关键词	gravity Moho Tibetan Plateau SGG-UGM-2 (2159-order high-precision gravity field model)
英文关键词	CRUSTAL STRUCTURE; COLLISION ZONE; ADJACENT AREAS; MANTLE FLOW; CHINA; BENEATH; DEFORMATION; MARGIN; LAND; SEAS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001026145500006
来源期刊	EARTH AND PLANETARY PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283768
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	He, HuiYou,Fang, Jian,Sun, HePing,et al. Moho depth inversion in the Tibetan Plateau from high-precision gravity data[J],2023,7(4).
APA	He, HuiYou,Fang, Jian,Sun, HePing,Guo, DongMei,Xue, ZhiXin,&Hou, Jing.(2023).Moho depth inversion in the Tibetan Plateau from high-precision gravity data.EARTH AND PLANETARY PHYSICS,7(4).
MLA	He, HuiYou,et al."Moho depth inversion in the Tibetan Plateau from high-precision gravity data".EARTH AND PLANETARY PHYSICS 7.4(2023).