SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite, southwestern China Geochronological constraints for the evolution of Paleo-Tethys

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	SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite, southwestern China Geochronological constraints for the evolution of Paleo-Tethys
	Jian, P (Jian, Ping); Liu, DY (Liu, Dunyi); Sun, XM (Sun, Xiaomeng)
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2008
卷号	32 期号:5-6 页码:371-384
关键词	China Jinshajiang ophiolite melange SHRIMP dating zircon
ISSN号	1367-9120
英文摘要	SHRIMP U-Pb zircon dating of gabbro, anorthosite, trondhjemite and granodiorite from the Jinshajiang ophiolitic melange of southwestern China provides geochronological constraints on the evolution of Paleo-Tethys. The ophiolitic melange is exposed for about 130 km along the Jinshajiang River where numerous blocks of serpentinite, ultramafic cumulate, gabbro, sheeted dikes, pillow lavas and radiolarian chert are set in a greenschist matrix. A cumulate gabbro-anorthosite association and an amphibole gabbro have ages of 338 +/- 6 Ma, 329 +/- 7 Ma and 320 +/- 10 Ma, respectively, which constrain the time of formation of oceanic crust. An ophiolitic isotropic gabbro dated at 282-285 Ma has the same age as a trondhjemite vein (285 6 Ma) cutting the gabbro. These ages probably reflect a late phase of sea-floor spreading above an intra-oceanic subduction zone. At the southern end of the Jinshajiang belt, a granitoid batholith (268 +/- 6 Ma), a gabbro massif (264 +/- 4 Ma), and a granodiorite (adakite) intrusion (263 +/- 6 Ma) in the ophiolitic melange constitute a Permian intra-oceanic plutonic arc complex. A trondhjemite dike intruded serpentinite in the melange at 238 +/- 10 Ma and postdates the are evolution of the Jinshajiang segment of Paleo-Tethys. (C) 2007 Elsevier Ltd. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	U-PB GEOCHRONOLOGY ; PLAGIOGRANITE ; ORIGIN ; DOMAIN ; MAGMAS ; ROCKS ; OMAN
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000256265700006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38759]
专题	中国地质调查局
作者单位	Jiling Univ, Jiling 130022, Peoples R China
推荐引用方式 GB/T 7714	Jian, P ,Liu, DY ,Sun, XM . SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite, southwestern China Geochronological constraints for the evolution of Paleo-Tethys[J]. JOURNAL OF ASIAN EARTH SCIENCES,2008,32(5-6):371-384.
APA	Jian, P ,Liu, DY ,&Sun, XM .(2008).SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite, southwestern China Geochronological constraints for the evolution of Paleo-Tethys.JOURNAL OF ASIAN EARTH SCIENCES,32(5-6),371-384.
MLA	Jian, P ,et al."SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite, southwestern China Geochronological constraints for the evolution of Paleo-Tethys".JOURNAL OF ASIAN EARTH SCIENCES 32.5-6(2008):371-384.