Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (I) Geochemistry of ophiolites, arc/back-arc assemblages and within-plate igneous rocks

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	Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (I) Geochemistry of ophiolites, arc/back-arc assemblages and within-plate igneous rocks
	Jian, P (Jian, Ping); Liu, DY (Liu, Dunyi); Kroner, A (Kroener, Alfred); Zhang, Q (Zhang, Qi); Wang, YZ (Wang, Yizhao); Sun, XM (Sun, Xiaomeng); Zhang, W (Zhang, Wei)
刊名	LITHOS
	2009
卷号	113 期号:3-4 页码:748-766
关键词	Geochemistry Ophiolite Arc/back-arc assemblages Within-plate igneous rocks Paleo-Tethys Southwest China
ISSN号	0024-4937
英文摘要	The Paleo-Tethys Orogen in southwest China is an amalgamation of continental terranes (Sibumasu, Simao and Yangtze), which are bounded by ophiolite belts (Ailaoshan, Jinshajiang and Changning-Menglian) that represent former ocean basins. This study concentrates on ophiolites, arc/back-arc assemblages, and within-plate igneous rocks that occur in this complex orogen. Mainly based on geochemical fingerprinting of basalts, the Paleo-Tethys ophiolites are here classified as MORB and SSZ types. The Ailaoshan ophiolite (NMORB-type; ca. 387-374 Ma) is associated with a non-volcanic segment of the rifted western Yangtze margin. The Jinshajiang ophiolite (EMORB-type; 346-341 Ma), which has ophiolite structure but some samples bear crustal contamination signatures, is associated with a volcanic segment of the rifted Yangtze western margin. These MORB-type ophiolites are interpreted to have formed in the continent-ocean transition zones. The Changning Menglian ophiolite, which marks the main Paleo-Tethys suture, that is, the boundary between the Gondwana-derived Sibumasu terrane and the Yangtze-derived Simao terrane, has traditionally been thought to have a mid-ocean ridge (MOR) origin. New trace element data of basalts, however, indicate that this ophiolite (ca. 270-264 Ma) was formed at a supra-subduction zone (SSZ). Arc and back-arc assemblages are represented by the Gicha (ca. 311-277 Ma) and Banpo (ca. 288-284 Ma) zoned mafic-ultramafic complexes and the Yaxianqiao arc volcanic rocks (ca. 268-264 Ma). Geochemical data suggest that the Gicha complex originated in a back-arc rift. The Banpo complex makes a plutonic arc that contains low-Ti gabbro and tonalite with volcanic arc granite (VAG) affinity. Within-plate igneous rocks are recognized as xenoliths (amphibolites; ca. 443-401 Ma) in the Jinshajinag ophiolite melange and the Dalongkai small differentiated mafic-ultramafic intrusion (ca. 247-244 Ma) that intruded the Yaxianqiao Arc. The amphibolite xenoliths are similar to low-Ti continental flood basalts (CFB) in composition. Rocks from the small mafic-ultramafic intrusion have superimposed subduction and within-plate geochemical signatures. These ophiolites, arc/back-arc assemblages and within-plate igneous rocks, are summarized as the magmatic records for the Plaeo-Tethys evolution in the context of a plate tectonic cycle. (C) 2009 Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	OCEAN-CONTINENT TRANSITION ; VOLCANIC RIFTED MARGIN ; RARE-EARTH PATTERNS ; FLOOD BASALTS ; RED-SEA ; ISOTOPIC CONSTRAINTS ; EASTERN SWITZERLAND ; MELT/ROCK REACTION ; CENTRAL ATLANTIC ; PASSIVE-MARGIN
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000272787200026
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39030]
专题	中国地质调查局
作者单位	Jilin Univ, Fac Appl Technol, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Jian, P ,Liu, DY ,Kroner, A ,et al. Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (I) Geochemistry of ophiolites, arc/back-arc assemblages and within-plate igneous rocks[J]. LITHOS,2009,113(3-4):748-766.
APA	Jian, P .,Liu, DY .,Kroner, A .,Zhang, Q .,Wang, YZ .,...&Zhang, W .(2009).Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (I) Geochemistry of ophiolites, arc/back-arc assemblages and within-plate igneous rocks.LITHOS,113(3-4),748-766.
MLA	Jian, P ,et al."Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (I) Geochemistry of ophiolites, arc/back-arc assemblages and within-plate igneous rocks".LITHOS 113.3-4(2009):748-766.