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DOI	10.1016/j.epsl.2006.11.019
	Postcollisional calc-alkaline lavas and xenoliths from the southern Qiangtang terrane, central Tibet
	Ding, Lin; Kapp, Paul; Yue, Yahui; Lai, Qingzhou
发表日期	2007
ISSN	0012-821X
EISSN	1385-013X
起始页码	28
结束页码	38
卷号	254 期号:1-2
英文摘要	A newly recognized east-west trending province of 43 to 28 Ma volcanic rocks occurs in the southern Qiangtang terrane of central Tibet. The lavas are Na-rich calc-alkaline in composition, relatively primitive, and locally host ultramafic and mafic xenoliths. Foliated mafic granulite xenoliths from similar to 28 Ma lavas equilibrated at temperatures in the range of 980 to 1260 degrees C, indicating that the southern Qiangtang terrane lower crust was deformed and heated to very high temperatures during or before the Oligocene. In the northern Qiangtang terrane is a parallel suite of volcanic rocks of coeval age. However, here, the volcanic rocks are (ultra)potassic in composition and underlain by a hot (T > 800 degrees C) metasedimentary-bearing lower crust. We suggest that both suites of Qiangtang lavas were derived from a primitive mantle source and that the enriched nature of the northern Qiangtang lavas reflects contamination by partial melts of metasedimentary lower crust. This contrasts with the conventional interpretation that Tibetan potassic lavas were solely derived from an ancient, enriched mantle lithospheric source. While removal of lithospheric mantle seems to be required to produce the high temperature melts, Eocene-Oligocene volcanism was coeval with thrust reactivation along bounding suture zones, implying that mantle dynamics were linked to intracontinental subduction. (c) 2006 Elsevier B.V. All rights reserved.
关键词	EAST-WEST EXTENSION NORTHERN TIBET TECTONIC EVOLUTION CRUSTAL XENOLITHS VOLCANIC-ROCKS PLATEAU UPLIFT MAGMATISM COLLISION LHASA
英文关键词	Tibetan plateau; postcollisional volcanism; xenoliths; intracontinental subduction
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000244595000003
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/257477
推荐引用方式 GB/T 7714	Ding, Lin,Kapp, Paul,Yue, Yahui,et al. Postcollisional calc-alkaline lavas and xenoliths from the southern Qiangtang terrane, central Tibet[J]. 中国科学院青藏高原研究所,2007,254(1-2).
APA	Ding, Lin,Kapp, Paul,Yue, Yahui,&Lai, Qingzhou.(2007).Postcollisional calc-alkaline lavas and xenoliths from the southern Qiangtang terrane, central Tibet.EARTH AND PLANETARY SCIENCE LETTERS,254(1-2).
MLA	Ding, Lin,et al."Postcollisional calc-alkaline lavas and xenoliths from the southern Qiangtang terrane, central Tibet".EARTH AND PLANETARY SCIENCE LETTERS 254.1-2(2007).