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Crustal structure of the middle segment of the Qilian fold belt and the coupling mechanism of its associated basin and range system
Jia, SX (Jia, Shixu)1; Guo, WB (Guo, Wenbin)1; Mooney, WD (Mooney, Walter D.)2; Wang, FY (Wang, Fuyu)1; Duan, YH (Duan, Yonghong)1; Zhao, JM (Zhao, Junmeng)3; Lin, JY (Lin, Jiyan)1; Liu, Z (Liu, Zhi)1
Source PublicationTECTONOPHYSICS
2019
Volume770Issue:0Pages:128154
DOI10.1016/j.tecto.2019.06.024
Abstract

We present an analysis of the P-wave seismic velocity structure of the Qilian fold belt based on a 750-km-long seismic wide-angle reflection/refraction profile. The results show that the internal portion of the Alxa block has a crustal thickness of approximately 45-48 km, with an average velocity of 6.19 km/s. Although the Alxa crust is thick, it is lateral homogeneous and relatively stable. The Hexi Corridor, which is located on the southern margin of the Alxa block, has been affected by the collision and extrusion of the northern margin of the Tibetan Plateau. The Hexi Corridor has a crustal thickness of 48-59 km with substantial thickening southward and an average seismic velocity of 6.10-6.13 km/s, indicating strong crustal deformation. Located on the northeastern margin of the Tibetan Plateau, the Qinling fold belt (QFB), Gonghe basin and Elashan mountains all have a crustal thickness is 51-56 km with a low average seismic velocity of 5.86-6.10 km/s, indicating significant reconstruction via shortening that has resulted in thickening of the northeastern Tibetan plateau crust. The tectonic coupling between the Qilian fold belt and the neighboring blocks in the south and north form a crustal-scale depression. Combining the regional geology, gravity and GPS measurements, and strong earthquake focal mechanism solutions, we constrain the crustal deformation processes of the northeastern of Tibet Plateau.

Subject AreaGeophysics
WOS IDWOS:000498329500002
Language英语
Indexed BySCI
KeywordNortheastern Tibetan Plateau Quaternary Slip Rates Tectonic Blocks Margin China Deformation Continent Asia
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0040-1951
Department大陆碰撞与高原隆升重点实验室
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PublisherELSEVIER
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9093
Collection图书馆
Corresponding AuthorJia, SX (Jia, Shixu)
Affiliation1.China Earthquake Adm, Geophys Explorat Ctr, Zhengzhou 450002, Henan, Peoples R China;
2.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA;
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China.
Recommended Citation
GB/T 7714
Jia, SX ,Guo, WB ,Mooney, WD ,et al. Crustal structure of the middle segment of the Qilian fold belt and the coupling mechanism of its associated basin and range system[J]. TECTONOPHYSICS,2019,770(0):128154.
APA Jia, SX .,Guo, WB .,Mooney, WD .,Wang, FY .,Duan, YH .,...&Liu, Z .(2019).Crustal structure of the middle segment of the Qilian fold belt and the coupling mechanism of its associated basin and range system.TECTONOPHYSICS,770(0),128154.
MLA Jia, SX ,et al."Crustal structure of the middle segment of the Qilian fold belt and the coupling mechanism of its associated basin and range system".TECTONOPHYSICS 770.0(2019):128154.
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