气候变化领域集成服务门户(CCPortal): Crustal structure of the middle segment of the Qilian fold belt and the coupling mechanism of its associated basin and range system

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DOI	10.1016/j.tecto.2019.06.024
	Crustal structure of the middle segment of the Qilian fold belt and the coupling mechanism of its associated basin and range system
	Jia, Shixu; Guo, Wenbin; Mooney, Walter D.; Wang, Fuyu; Duan, Yonghong; Zhao, Junmeng; Lin, Jiyan; Liu, Zhi
通讯作者	Jia, SX (通讯作者)
发表日期	2019
ISSN	0040-1951
EISSN	1879-3266
卷号	770
英文摘要	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.
关键词	NORTHEASTERN TIBETAN PLATEAU QUATERNARY SLIP RATES TECTONIC BLOCKS MARGIN CHINA DEFORMATION CONTINENT ASIA
英文关键词	Deep Seismic Sounding; Qilian fold belt; The Tibetan Plateau; Seismotectonics
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000498329500002
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259522
推荐引用方式 GB/T 7714	Jia, Shixu,Guo, Wenbin,Mooney, Walter D.,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]. 中国科学院青藏高原研究所,2019,770.
APA	Jia, Shixu.,Guo, Wenbin.,Mooney, Walter D..,Wang, Fuyu.,Duan, Yonghong.,...&Liu, Zhi.(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.
MLA	Jia, Shixu,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(2019).