Geochemistry and zircon U-Pb ages of adakitic rocks from the Dulan area of the North Qaidam UHP terrane, north Tibet Constraints on the timing and nature of regional tectonothermal events associated with collisional orogeny

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	Geochemistry and zircon U-Pb ages of adakitic rocks from the Dulan area of the North Qaidam UHP terrane, north Tibet Constraints on the timing and nature of regional tectonothermal events associated with collisional orogeny
	Yu, SY (Yu, Shengyao); Zhang, JX (Zhang, Jianxin); Del Real, PG (Del Real, Pablo Garcia)
刊名	GONDWANA RESEARCH
	2012
卷号	21 期号:1 页码:167-179
关键词	North Qaidam Mountains Adakitic rock Geochemistry Zircon geochronology Leucosome Tonalite Tectonothermal event
ISSN号	1342-937X
英文摘要	Geochemistry and U-Pb ages of leucosomes and tonalites in a high pressure granulite unit of the Dulan area have been determined to constrain the tectonothermal evolution related to collision and thickening of lower crust in the North Qaidam Mountains (NQD). Leucosomes and tonalites show a marked chemical resemblance to adakites (1) high La/Yb and Sr/Y, and low Y and HREE; (2) high Al2O3 and low Mg-# values with obvious positive Eu anomalies and (3) slightly positive epsilon(Nd)(t) values. Zircon U-Pb analysis of leucosomes and tonalites yielded Pb-206/U-238 ages of 428-437 Ma and 436-437 Ma respectively, which constrain the emplacement ages of the adakitic rocks. Petrological, geochronological and geochemical characters indicate that the adakitic rocks may have been derived from partial melting of a thickened mafic lower crust (>50 km), suggesting a dominating source regime of synchronous high-pressure mafic granulites. Contemporary magmatism in other units of the NQD shows evidence of a widespread tectonothermal event during early Silurian (420-450 Ma) that includes metamorphism, magmatism and anatexis related to collision and thickening of lower crust. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	LOWER CONTINENTAL-CRUST ; UNDERPLATED BASALTIC CRUST ; THICKENED LOWER CRUST ; NW CHINA ; WESTERN CHINA ; GARNET PERIDOTITE ; METAMORPHIC BELT ; HIGH-PRESSURE ; HP/UHP TERRANE ; OCEANIC-CRUST
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000300204400013
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39819]
专题	中国地质调查局
作者单位	Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA
推荐引用方式 GB/T 7714	Yu, SY ,Zhang, JX ,Del Real, PG . Geochemistry and zircon U-Pb ages of adakitic rocks from the Dulan area of the North Qaidam UHP terrane, north Tibet Constraints on the timing and nature of regional tectonothermal events associated with collisional orogeny[J]. GONDWANA RESEARCH,2012,21(1):167-179.
APA	Yu, SY ,Zhang, JX ,&Del Real, PG .(2012).Geochemistry and zircon U-Pb ages of adakitic rocks from the Dulan area of the North Qaidam UHP terrane, north Tibet Constraints on the timing and nature of regional tectonothermal events associated with collisional orogeny.GONDWANA RESEARCH,21(1),167-179.
MLA	Yu, SY ,et al."Geochemistry and zircon U-Pb ages of adakitic rocks from the Dulan area of the North Qaidam UHP terrane, north Tibet Constraints on the timing and nature of regional tectonothermal events associated with collisional orogeny".GONDWANA RESEARCH 21.1(2012):167-179.