Petrogenetic evolution of the Bayan Gol ophiolite - Geological record of;an Early Carboniferous "Red Sea type" ocean basin in the Tianshan;Mountains, Northwestern China

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	Petrogenetic evolution of the Bayan Gol ophiolite - Geological record of;an Early Carboniferous "Red Sea type" ocean basin in the Tianshan;Mountains, Northwestern China
	Xia, LQ; Li, XM; Xu, XY; Xia, ZC; Ma, ZP; Wang, LS
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2005
卷号	79 期号:2 页码:174-192
关键词	ophiolite rift volcanics petrogenetic evolution Bayan Gol Tianshan Mountains NW China
ISSN号	1000-9515
英文摘要	The Bayan Got ophiolite fragment is a portion of the North Tianshan Early Carboniferous ophiolite belt. This ophiolite belt represents a geological record of an Early Carboniferous "Red Sea type" ocean basin that was developed on the northern margin of the Tianshan Carboniferous-Permian rift system in northwestern China.;The late Early Carboniferous Bayan Gol ophiolite suite was emplaced in an Early Carboniferous rift volcano-sedimentary succession of shallow-marine to continental facies (Volcanics Unit). Ophiolitic rocks in the Bayan Got area comprise ultramafic rocks, gabbros with associated plagiogranite veins, diorite, diabase, pillow basalts and massive lavas. The Early Carboniferous rifting and the opening process of the North Tianshan ocean basin produced mafic magmas in composition of tholeiite and minor amounts of evolved magmas. Compositions of trace elements and Nd, Sr and Pb isotopes reveal the presence of two distinct mantle sources: (1) the Early Carboniferous rift mafic lavas from the Volcanics Unit were generated by a relatively low degree of partial melting of an asthenospheric OEB-type intraplate source; (2) younger (late Early Carboniferous, similar to 324.8 Ma ago) mafic lavas from the Ophiolite Unit were formed in a relatively depleted MORB-like mantle source, located in the uppermost asthenosphere and then gradually mixed with melts from the asthenospheric OIB-like mantle. A slight interaction between asthenosphere-derived magmas and lithospheric mantle took place during ascent to the surface. Subsequently, the most depleted mafic lavas of the ophiolite assemblage were contaminated by upper-crustal components (seawater or carbonate crust).
学科主题	火成岩岩石学
WOS关键词	VOLCANIC-ROCKS ; CENTRAL GERMANY ; MANTLE ; VOGELSBERG ; ORIGIN
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000229812800004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37876]
专题	中国地质调查局西安地质调查中心
作者单位	China Geol Survey, Xian Inst Geol & Mineral Resources, Xian 710054, Shaanxi, Peoples R China.
推荐引用方式 GB/T 7714	Xia, LQ,Li, XM,Xu, XY,et al. Petrogenetic evolution of the Bayan Gol ophiolite - Geological record of;an Early Carboniferous "Red Sea type" ocean basin in the Tianshan;Mountains, Northwestern China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2005,79(2):174-192.
APA	Xia, LQ,Li, XM,Xu, XY,Xia, ZC,Ma, ZP,&Wang, LS.(2005).Petrogenetic evolution of the Bayan Gol ophiolite - Geological record of;an Early Carboniferous "Red Sea type" ocean basin in the Tianshan;Mountains, Northwestern China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,79(2),174-192.
MLA	Xia, LQ,et al."Petrogenetic evolution of the Bayan Gol ophiolite - Geological record of;an Early Carboniferous "Red Sea type" ocean basin in the Tianshan;Mountains, Northwestern China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 79.2(2005):174-192.