A gravity study along a profile across the Sichuan Basin, the Qinling Mountains and the Ordos Basin (central China): Density, isostasy and dynamics
文献类型：期刊论文
| 作者 | Zhang, Yongqian1,2; Teng, Jiwen3; Wang, Qianshen3; Lu, Qingtian2; Si, Xiang4; Xu, Tao3,5; Badal, Jose6; Yan, Jiayong1,2; Hao, Zhaobing3 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 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 |
| WOS记录号 | WOS:000413125600023 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 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) |
| 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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