A deep seismic sounding profile across the Tianshan Mountains

	A deep seismic sounding profile across the Tianshan Mountains
	Lu, DY 3; Li, QS ; Gao, R ; Li, YK ; Li, DX ; Liu, W ; Zhang, ZY
刊名	CHINESE SCIENCE BULLETIN
	2000
卷号	45 期号:22 页码:2100-2107
关键词	Tianshan Mountains crust structure deep seismic sounding profile intracontinental subduction
ISSN号	1001-6538
英文摘要	The deep seismic sounding profile across the Tianshan Mountains revealed a two-layer crustal structure in the Tianshan region, namely the lower and upper crusts. Lateral variations of layer velocity and thickness are evidently shown. Low-velocity layers spread discontinuously at the bottom of the upper crust. The Moho depth is 47 km in the Kuytun area and 50 km in the Xayar area. In the Tianshan Mountains, the Moho becomes deeper with the maximum depth of 62 km around the boundary between the southern and northern Tianshan Mountains. The average velocity ranges from 6.1 to 6.3 km/s in the crust and 8.15 km/s at the top of the upper mantle. Two groups of reliable reflective seismic phases of the Moho (P-m1 and P-m2) are recognized on the shot record section of the Kuytun area. A staked and offset region, 20-30 km long, is displayed within a shot-geophone distance of 190-210 km in P-m1 and P-m2 Calculation shows that the Moho is offset by 10 km in the northern Tianshan region, 62 km deep in the south while 52 km deep in the north, and plunges northwards. In comparison with typical collisional orogenic belts, the structure of the Moho beneath the Tianshan Mountains presents a similar pattern. This can be used to explain the subduction of the Tarim plate towards the Tianshan Mountains. This intracontinental subduction is considered the dynamic mechanism of the Cenozoic uplifting of the Tianshan Mountains. The discovery of seismic phases P-m1 and Pm-2 serves as the seismological evidence for the northward subduction of the Tarim plate.
学科主题	地球物理勘探
WOS关键词	CRUSTAL STRUCTURE ; BENEATH
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000165798500017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37415]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Lithosphere Res Ctr, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Comprehens Res Team 562, Sanhe 101601, Peoples R China. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Lu, DY,Li, QS,Gao, R,et al. A deep seismic sounding profile across the Tianshan Mountains[J]. CHINESE SCIENCE BULLETIN,2000,45(22):2100-2107.
APA	Lu, DY.,Li, QS.,Gao, R.,Li, YK.,Li, DX.,...&Zhang, ZY.(2000).A deep seismic sounding profile across the Tianshan Mountains.CHINESE SCIENCE BULLETIN,45(22),2100-2107.
MLA	Lu, DY,et al."A deep seismic sounding profile across the Tianshan Mountains".CHINESE SCIENCE BULLETIN 45.22(2000):2100-2107.