Density structure and isostatic state of the crust in the Longmenshan and adjacent areas

doi:10.1016/j.tecto.2013.08.018

	Density structure and isostatic state of the crust in the Longmenshan and adjacent areas
	Zhang, Yongqian; Teng, Jiwen; Wang, Qianshen; Hu, Guoze
刊名	TECTONOPHYSICS
	2014-04-21
卷号	619 页码:51-57
关键词	Gravity anomalies Density structure Isostasy Longmenshan Sichuan basin China
ISSN号	0040-1951
DOI	10.1016/j.tecto.2013.08.018
文献子类	Article
英文摘要	In this study, we've analyzed some new gravity data obtained from two profiles across the Longmenshan (LMS) Fault system in order to determine the density structure and isostatic state of the crust beneath the SongpanGanzi block (SG) and the Sichuan basin (SC). According to our research, Bouguer gravity anomalies along the two profiles range from 450 mGal in the SG to 80 mGal in the SC. And density structural models show obvious differences between the SG and the SC. Compared with the SC, the SG has lower average density in the crust, and it has a low-density layer with thickness of 5 km in the middle crust. In the SC area, however, the crustal density increases gradually with depth and there exists no low-density layer in the crust. The Moho interface decreases from 60 km beneath the SG in east Tibet to 40 km beneath the SC. In the LMS region, the topography, Bouguer gravity, and Moho depth change abruptly in a narrow tectonic belt. The crustal isostatic state, which is derived from the Airy compensation model based on the topography, gravity and deep seismic sounding data, indicates that the SG on the northwest side of the LMS is not in an isostatic state, compared with the isostatic crust beneath the SC. The isostatic equilibrium of the crust under the northeast section of the LMS is not achieved as that in the southwest section of the LMS. Based on the research, we infer that the non-homogenous collision between the Tibetan Plateau and the Yangtze Craton has caused the strong variation of the Moho depth and the special isostafic state of the crust in this area. (c) 2013 Elsevier B.V. All rights reserved.
WOS关键词	WENCHUAN EARTHQUAKE ; TIBETAN PLATEAU ; EASTERN MARGIN ; FLOW ; DEFORMATION ; UPLIFT ; ZONE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000335284900006
资助机构	"Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; "Wenchuan Earthquake Fault Scientific Drilling" of the National Science and Technology Planning ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; National Natural Science Foundation of China(41204063) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449) ; China Post-doctoral Science Foundation(20100480449)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86502]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Yongqian
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yongqian,Teng, Jiwen,Wang, Qianshen,et al. Density structure and isostatic state of the crust in the Longmenshan and adjacent areas[J]. TECTONOPHYSICS,2014,619:51-57.
APA	Zhang, Yongqian,Teng, Jiwen,Wang, Qianshen,&Hu, Guoze.(2014).Density structure and isostatic state of the crust in the Longmenshan and adjacent areas.TECTONOPHYSICS,619,51-57.
MLA	Zhang, Yongqian,et al."Density structure and isostatic state of the crust in the Longmenshan and adjacent areas".TECTONOPHYSICS 619(2014):51-57.