A gravity study along a profile across the Sichuan Basin, the Qinling Mountains and the Ordos Basin (central China): Density, isostasy and dynamics

doi:10.1016/j.jseaes.2017.07.036

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	A gravity study along a profile across the Sichuan Basin, the Qinling Mountains and the Ordos Basin (central China): Density, isostasy and dynamics
	Zhang, Yongqian 1,2; Teng, Jiwen 3; Wang, Qianshen 3; Lu, Qingtian 2; Si, Xiang 4; Xu, Tao 3,5; Badal, Jose 6; Yan, Jiayong 1,2; Hao, Zhaobing 3
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2017-10-01
卷号	147 页码:310-321
关键词	Gravity Density Isostasy Moho depth Delamination Middle Qinling Orogen
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2017.07.036
文献子类	Article
英文摘要	In order to investigate the structure of the crust beneath the Middle Qinling Mountains (MQL) and neighboring areas in the North China Block and South China Block, a north-south gravity profile from Yuquan in the Sichuan Basin to Yulin in the Ordos Basin was conducted in 2011. The Bouguer gravity anomaly is determined from a high-quality gravity dataset collected between 31 degrees N and 36 degrees N of latitude, and varies between -200 and -110 mGal in the study region. Using accredited velocity density relationships, an initial crust-mantle density model is constructed for MQL and adjacent areas, which is later refined interactively to simulate the observed gravity anomaly. The present study reveals the features of the density and Bouguer gravity with respect to the tectonic units sampled by the profile. The lithosphere density model shows typical density values that depict a layered structure and allow differentiate the blocks that extend along the reference profile. The gravity field calculated by forward modeling from the final density distribution model correlates well with the measured gravity field within a standard deviation of 1.26 mGal. The density in the crystalline crust increases with depth from 2.65 g/cm(3) up to the highest value of 2.95 g/cm(3) near the bottom of the crust. The Conrad interface is identified as a density jump of about 0.05 g/cm(3). The average density of the crust in MQL is clearly lower than the density in the formations on both sides. Starting from a combined Airy-Pratt isostatic compensation model, a partly compensated crust is found below MQL, suggesting future growth of the crust, unlike the Ordos and Sichuan basins that will remain stable. On the basis of the density and isostatic state of the crust and additional seismological research, such as the P-wave velocity model and Poisson's ratio, it is concluded that the lower crust delamination is a reasonable interpretation for the geophysical characteristics below the Qinling Orogen.
WOS关键词	MESOZOIC TECTONIC EVOLUTION ; OROGENIC BELT ; SOUTH CHINA ; CRUSTAL STRUCTURE ; NORTH CHINA ; SEISMIC-REFLECTION ; ADJACENT AREAS ; CRYSTALLINE BASEMENT ; CONTINENTAL-CRUST ; ELASTIC THICKNESS
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000413125600023
资助机构	Ministry of Land and Resources of China ; National Natural Science Foundation of China(41574082 ; 41204063 ; 90914012 ; 41204096) ; Ministry of Land and Resources of China ; National Natural Science Foundation of China(41574082 ; 41204063 ; 90914012 ; 41204096) ; Ministry of Land and Resources of China ; National Natural Science Foundation of China(41574082 ; 41204063 ; 90914012 ; 41204096) ; Ministry of Land and Resources of China ; National Natural Science Foundation of China(41574082 ; 41204063 ; 90914012 ; 41204096)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62006]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Zhang, Yongqian
作者单位	1.Chinese Acad Geol Sci, MLR Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 10037, Peoples R China 2.Chinese Acad Geol Sci, China Deep Explorat Ctr, SinoProbe Ctr, Beijing 100037, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China 4.Minist Land & Resources, Strateg Res Ctr Oil & Gas Resources, Beijing 100034, Peoples R China 5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 6.Univ Zaragoza, Phys Earth, Sci B, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
推荐引用方式 GB/T 7714	Zhang, Yongqian,Teng, Jiwen,Wang, Qianshen,et al. A gravity study along a profile across the Sichuan Basin, the Qinling Mountains and the Ordos Basin (central China): Density, isostasy and dynamics[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,147:310-321.
APA	Zhang, Yongqian.,Teng, Jiwen.,Wang, Qianshen.,Lu, Qingtian.,Si, Xiang.,...&Hao, Zhaobing.(2017).A gravity study along a profile across the Sichuan Basin, the Qinling Mountains and the Ordos Basin (central China): Density, isostasy and dynamics.JOURNAL OF ASIAN EARTH SCIENCES,147,310-321.
MLA	Zhang, Yongqian,et al."A gravity study along a profile across the Sichuan Basin, the Qinling Mountains and the Ordos Basin (central China): Density, isostasy and dynamics".JOURNAL OF ASIAN EARTH SCIENCES 147(2017):310-321.