New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision

doi:10.1360/02wd0586

	New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision
	Ding, L; Lai, QZ
刊名	CHINESE SCIENCE BULLETIN
	2003-08-01
卷号	48 期号:15 页码:1604-1610
关键词	leucogranite geochronology island arc Gangdese Tibetan Plateau
ISSN号	1001-6538
DOI	10.1360/02wd0586
文献子类	Article
英文摘要	Recent mapping in the Gangdese block has revealed many leucogranites that are similar to those in the High Himalaya. These leucogranites formed at similar to140 Ma as indicated by monazite Th-Pb ion-microprobe dating and cooled at similar to130 Ma as indicated by muscovite Ar-40/Ar-39 dating. In conjunction with previous structural and paleogeographic studies, the new data indicate that the Gangdese block underwent crustal thickening and associated exhumation during similar to140-130 Ma. In this regard, the southern margin of Eurasia continent was comparable to the modern South American Altiplano-Puna plateau, the prime example of active ocean-continent subduction and associated thickened crust. Specifically, the early stages of crustal thickening and uplifting of the Gangdese block may result from subduction of the Neo-Tethyan Ocean. If the Tibetan Plateau would form by accretion of a series of blocks with thickened crust, an elevated topographic plateau similar to the Altiplano-Puna plateau had formed before collision between the Indian and Eurasian plates. Then the Tibetan Plateau would have quickly thickened, uplifted, and begun to extend soon after onset of the collision. Thus, the deformational mechanism of the Tibetan Plateau is not distributed shortening, but rather concentrating deformation within regions of thin crust between the accreted blocks.
WOS关键词	BENEATH SOUTHERN TIBET ; HIMALAYAN ; EVOLUTION ; PLATEAU ; AGE ; ORIGIN ; CREATE ; ARC
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000184925400019
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79015]
专题	中国科学院地质与地球物理研究所
通讯作者	Ding, L
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ding, L,Lai, QZ. New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision[J]. CHINESE SCIENCE BULLETIN,2003,48(15):1604-1610.
APA	Ding, L,&Lai, QZ.(2003).New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision.CHINESE SCIENCE BULLETIN,48(15),1604-1610.
MLA	Ding, L,et al."New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision".CHINESE SCIENCE BULLETIN 48.15(2003):1604-1610.