Geochronology, geochemistry and petrogenesis of mafic and ultramafic   rocks from Southern Beishan area, NW China: Implications for   crust-mantle interaction

doi:10.1016/j.gr.2011.03.008

CORC > 北京大学 > 地球与空间科学学院

	Geochronology, geochemistry and petrogenesis of mafic and ultramafic rocks from Southern Beishan area, NW China: Implications for crust-mantle interaction
	Zhang, Yuanyuan ; Dostal, Jaroslav ; Zhao, Zehui ; Liu, Chang ; Guo, Zhaojie
刊名	gondwana research
	2011
关键词	Beishan Mafic and ultramafic rocks Geochemistry Magma tectonics Delamination Crust-mantle interaction ASIAN OROGENIC BELT TECTONIC IMPLICATIONS NORTHWEST CHINA VOLCANIC-ROCKS ISOTOPIC CONSTRAINTS HONGLIUHE OPHIOLITE PALEOZOIC TECTONICS CONTINENTAL GROWTH EASTERN XINJIANG GANSU PROVINCE
DOI	10.1016/j.gr.2011.03.008
英文摘要	The Liuyuan mafic and ultramafic rocks are exposed in Southern Beishan, which is along the southern branch of the Central Asian Orogenic Belt (CAOB). Zircon SHRIMP U-Pb dating showed that Liuyuan gabbros intruded during the early Permian (similar to 270-295 Ma) coeval with the basalts and the ultramafic rocks were emplaced at about 250 Ma. The basalts are within-plate tholeiites with slight enrichment in light rare earth elements (LREE) relative to heavy rare earths (HREE) and small negative anomalies of Nb and Ta. Gabbros including olivine gabbros, olivine gabbronorites and troctolites are grouped into two: the cumulate gabbros are depleted in LREE and show small negative Nb and Ta anomalies but distinct positive Sr and Eu anomalies; non-cumulate gabbros resemble tholeiitic basalts. Lamprophyres and cumulate ultramafic rocks are characterized by large enrichment of LREE relative to HREE with depletion in Nb and Ta. The enriched Sr-Nd isotopic trend from DM towards the EM II end member component implies that the lithospheric mantle was progressively enriched with depth by the involvement of subducted crustal material due to the delamination of thickened mantle lithosphere after collision. The digestion of subducted crustal material into the mantle resulting in the metasomatized and enriched mantle is inferred to be an important process during crust-mantle interaction. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000295754700010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); 28; ARTICLE; 4; 816-830; 20
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155766]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang, Yuanyuan,Dostal, Jaroslav,Zhao, Zehui,et al. Geochronology, geochemistry and petrogenesis of mafic and ultramafic rocks from Southern Beishan area, NW China: Implications for crust-mantle interaction[J]. gondwana research,2011.
APA	Zhang, Yuanyuan,Dostal, Jaroslav,Zhao, Zehui,Liu, Chang,&Guo, Zhaojie.(2011).Geochronology, geochemistry and petrogenesis of mafic and ultramafic rocks from Southern Beishan area, NW China: Implications for crust-mantle interaction.gondwana research.
MLA	Zhang, Yuanyuan,et al."Geochronology, geochemistry and petrogenesis of mafic and ultramafic rocks from Southern Beishan area, NW China: Implications for crust-mantle interaction".gondwana research (2011).