Geophysical profiling across the Sulu ultra-high-pressure metamorphic;belt, eastern China

doi:10.1016/S0040-1951(02)00386-4

	Geophysical profiling across the Sulu ultra-high-pressure metamorphic;belt, eastern China
	Yang, WC
刊名	TECTONOPHYSICS
	2002
卷号	354 期号:3-4 页码:277-288
关键词	geophysical profiling arched reflector ultra-high-pressure belt intracontinental subduction east China
ISSN号	0040-1951
DOI	10.1016/S0040-1951(02)00386-4
英文摘要	The largest ultra-high pressure metamorphic (UHPM) belt in the world is located along the Dabie-Sulu region, which tectonically belongs to the east part of the central orogenic belt of China. Integrated geophysical investigations of using deep seismic reflection, MT, and geothermal observations have been carried out in the Sulu area since 1997. The results of integrated interpretation suggest the existence of three features: (1) a rift beneath the Lianshui basin by the Jiashan-Xionshui fault; (2) a special crustal pattern, called the magmatic multi-arch structure occurs beneath the northern Sulu UHPM zone; and (3) a northwest-dipping regional thrust crosses the Sulu crust, representing the intracontinental subduction of the Yangtze craton beneath the Sulu metamorphic belts after collision between the Yangtze and, Sino-Korean cratons. A magmatic multi-arch structure consists of some arched reflectors that occur in both the lower and the upper crust where arched reflectors coincide with granitoid plutons. The multi-arch structures are common in eastern China where many Mesozoic granitoid plutons of different scales occur. The crustal structures in the Sulu metamorphic belts resulted from intensive dynamic processes following the Triassic collision between the Yangtze and Sino-Korean cratons. The formation and exhumation of UHPM rocks followed the collision, and then intracontinental subduction of the Yangtze craton beneath the Dabie-Sulu terranes took place in the early and middle Jurassic. In the late Jurassic, the Sulu lithosphere turned to an extensional regime, large-scale granitic intrusions occurred in eastern China; these likely resulted from lithospheric thinning and asthenospheric uplifting. The granitic intrusions came to a climax during the Cretaceous and were followed by rifting along existing faults in the early Eogene, resulting in many petroleum basins. The granitoid emplacement that generated the magmatic multi-arch structure and the rift were consequences of the lithospheric thinning process, and deep intracontinental subduction of the Yangtze craton beneath the Sulu metamorphic belt might partially contribute to the lithospheric thinning. (C) 2002 Elsevier Science B.V. All rights reserved.
学科主题	地球物理勘探
WOS关键词	DABIE SHAN ; CRUSTAL STRUCTURE ; UHPM TERRANE ; REFLECTION ; COLLISION ; ECLOGITES ; DYNAMICS ; ORIGIN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000178257200007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37523]
专题	中国地质科学院地质研究所
作者单位	CAGS, Inst Geol, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Yang, WC. Geophysical profiling across the Sulu ultra-high-pressure metamorphic;belt, eastern China[J]. TECTONOPHYSICS,2002,354(3-4):277-288.
APA	Yang, WC.(2002).Geophysical profiling across the Sulu ultra-high-pressure metamorphic;belt, eastern China.TECTONOPHYSICS,354(3-4),277-288.
MLA	Yang, WC."Geophysical profiling across the Sulu ultra-high-pressure metamorphic;belt, eastern China".TECTONOPHYSICS 354.3-4(2002):277-288.