The Fuchuan ophiolite in Jiangnan Orogen: Geochemistry, zircon U-Pb;geochronology, Hf isotope and implications for the Neoproterozoic;assembly of South China

doi:10.1016/j.lithos.2013.08.015

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	The Fuchuan ophiolite in Jiangnan Orogen: Geochemistry, zircon U-Pb;geochronology, Hf isotope and implications for the Neoproterozoic;assembly of South China
	Zhang, Chuan-Lin 6; Santosh, M.; Zou, Hai-Bo ; Li, Huai-Kun ; Huang, Wen-Cheng
刊名	LITHOS
	2013
卷号	179 页码:263-274
关键词	Jiangnan Orogen Fuchuan ophiolite Zircon U-Pb geochronology Suprasubduction zone Tectonic implications
ISSN号	0024-4937;EI 1872-6143
DOI	10.1016/j.lithos.2013.08.015
英文摘要	The Fuchuan ophiolite occurs along the easternmost domain of the Jiangnan Orogen, considered as the suture between Yangtze and Cathaysia Blocks in South China. Here we report results from our new field observations, zircon U-Pb ages and Hf isotope of the cumulate units, chemistry and tectonic discrimination of Cr-spinel from the harzburgite, and whole rock geochemistry of the pillow lava from the ophiolite in an attempt to evaluate the Neoproterozoic tectonic evolution of South China. The zircon data indicate that the ophiolite suite formed at 840-820 Ma, and the high epsilon(Hf)(t) (8-13) and epsilon(Nd)(t) (3.3-5.7) values suggest that the cumulates were derived from significantly depleted mantle sources. The pillow lavas and the keratophyres, show typical calc-alkalic continental arc-signatures including the enrichment in LREE and LILE, and depletion in HFSE (Nb/La = 0.3 to 0.5) and a wide range of epsilon(Nd)(t) values (-1.2 to 2.5). The chromium-spinels from the serpentinized harzburgite show Cr-# ranging from 40 to 67 and Mg-# from 33 to 60 comparable with the chemistry of spinels from suprasubduction zone (SSZ)-type ophiolites. The geochemical features as well as the association of coeval I-S type granites and several thousand meters of flysch-type sedimentary sequences correlate the Fuchuan ophiolite to SSZ-type. We suggest that the emplacement of the Fuchuan ophiolite suite marks the time of final welding between the Yangtze and Cathaysia blocks in South China at ca.820 Ma (C) 2013 Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	TECTONIC EVOLUTION ; CATHAYSIA BLOCKS ; VOLCANIC-ROCKS ; YANGTZE BLOCK ; PETROGENETIC INDICATOR ; OCEANIC LITHOSPHERE ; SPINEL COMPOSITIONS ; FORE-ARC ; BREAK-UP ; PERIDOTITES
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000328592900017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39950]
专题	中国地质调查局天津地质调查中心
作者单位	1.[Zhang, Chuan-Lin 2.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Jiangsu, Peoples R China. 3.[Santosh, M.] China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China. 4.Auburn Univ, Dept Geol & Geog, Auburn, AL 36849 USA. 5.Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China. 6.中国地质调查局南京地质调查中心
推荐引用方式 GB/T 7714	Zhang, Chuan-Lin,Santosh, M.,Zou, Hai-Bo,et al. The Fuchuan ophiolite in Jiangnan Orogen: Geochemistry, zircon U-Pb;geochronology, Hf isotope and implications for the Neoproterozoic;assembly of South China[J]. LITHOS,2013,179:263-274.
APA	Zhang, Chuan-Lin,Santosh, M.,Zou, Hai-Bo,Li, Huai-Kun,&Huang, Wen-Cheng.(2013).The Fuchuan ophiolite in Jiangnan Orogen: Geochemistry, zircon U-Pb;geochronology, Hf isotope and implications for the Neoproterozoic;assembly of South China.LITHOS,179,263-274.
MLA	Zhang, Chuan-Lin,et al."The Fuchuan ophiolite in Jiangnan Orogen: Geochemistry, zircon U-Pb;geochronology, Hf isotope and implications for the Neoproterozoic;assembly of South China".LITHOS 179(2013):263-274.