Collision tectonics between the Tarim block (basin) and the northwestern;Tibet plateau: New observations from a multidisciplinary geoscientific;investigation in the Western Kunlun Mountains

	Collision tectonics between the Tarim block (basin) and the northwestern;Tibet plateau: New observations from a multidisciplinary geoscientific;investigation in the Western Kunlun Mountains
	Xiao, XC 4; Liu, X ; Gao, R ; Luo, ZH
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2001
卷号	75 期号:2 页码:126-132
关键词	collision tectonics deep structure NW Tibet plateau
ISSN号	1000-9515
英文摘要	New results from deep seismic reflection profiling, wide-angle reflection-refraction profiling and broadband seismic experiments reveal that a series of south-dipping reflectors occur on the southern margin of the Tarim block (basin). However, it is these south-dipping structures that are intercepted by another series of north-dipping reflectors at depths from 30 to about 150 km beneath the foreland of the W Kunlun Mountains. No evidence from the above geophysical data as well as geochemical and surface geological data indicate the southward subduction of the Tarim block beneath the W Kunlun Mountains (NW Tibet plateau), forming the so-called "two-sided subduction" model for the Tibet plateau as proposed by previous studies. So the authors infer that the tectonic interaction between the Tarim block and the W Kunlun block was chiefly affected by a "horizontal compression in opposite directions", which brought about "face-to-face contact" between these two lithospheric blocks and led to the thickening, shortening and densifying of the lithosphere. Hence a "delamination" was formed due to the gravitational instability created by the thickening and densifying; then alkaline basic volcanic rocks (mainly shoshonite series) was erupted along the northern margin of the Tibet plateau owing to the delamination. This inference for the formation of the alkaline basic volcanics has been confirmed by recent geochemical and petrological studies in Tibet, indicating that different contacts control different magmatic activities: the alkali basalts are always developed in the "horizontal shortening boundary (contact)" on the northern margin of the Tibet plateau, while the muscovite granite and two-mica granite (leucogranite) in the "subductional contact" on the southern margin of the Tibet plateau.
学科主题	构造地质学
WOS关键词	VOLCANISM ; MODELS
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000169598600002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37466]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan. 3.China Univ Geosci, Beijing 100087, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Xiao, XC,Liu, X,Gao, R,et al. Collision tectonics between the Tarim block (basin) and the northwestern;Tibet plateau: New observations from a multidisciplinary geoscientific;investigation in the Western Kunlun Mountains[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2001,75(2):126-132.
APA	Xiao, XC,Liu, X,Gao, R,&Luo, ZH.(2001).Collision tectonics between the Tarim block (basin) and the northwestern;Tibet plateau: New observations from a multidisciplinary geoscientific;investigation in the Western Kunlun Mountains.ACTA GEOLOGICA SINICA-ENGLISH EDITION,75(2),126-132.
MLA	Xiao, XC,et al."Collision tectonics between the Tarim block (basin) and the northwestern;Tibet plateau: New observations from a multidisciplinary geoscientific;investigation in the Western Kunlun Mountains".ACTA GEOLOGICA SINICA-ENGLISH EDITION 75.2(2001):126-132.