The tectonic-setting of ophiolites in the western Qinghai-Tibet Plateau, China

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	The tectonic-setting of ophiolites in the western Qinghai-Tibet Plateau, China
	Qiu, RZ (Qiu, R. Z.); Zhou, S (Zhou, S.); Li, TD (Li, T. D.); Deng, JF (Deng, J. F.); Mao, QH (Mao, Q. H.); Wu, ZX (Wu, Z. X.); Cai, ZY (Cai, Z. Y.)
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2007
卷号	29 期号:2-3 特刊 SI 页码:215-228
关键词	ophiolite geology geochemistry tectonic setting SSZ type ophiolite western Qinghai-Tibetan Plateau
ISSN号	1367-9120
英文摘要	The study of geology, geochemistry, rare earth elements, trace elements, Pb and Sr isotopes of representative ophiolite bodies from four ophiolitic belts in the western Qinghai-Tibetan Plateau, shows that the mantle peridotites of these ophiolites are mainly harzburgite in composition, with minor dunite. They are characterized by high magnesium (MgO) and low aluminum, calcium and alkali oxide contents. Enrichment of light rare earth elements in mantle peridotites may be due to two geological processes relatively strong partial melting; and later metasomatism by the liquids released during the subduction of oceanic crust. Mantle peridotites are characterized by low contents of the trace elements Sr, Ti and Y and relatively high contents of Rb, Nb, Zr, Elf and Th, similar to metasomatic pyrolite. The isotopic compositions of Sr and Pb show evidence of contamination by a crustal component. All the evidence indicates that the four ophiolite belts in the western Qinghai-Tibetean Plateau have undergone metasomatism by liquids released during the subduction of oceanic crust, suggesting that they were formed in a supra-subduction zone (SSZ) tectonic setting. The mantle peridotites in ophiolite belts located in eastern Qinghai-Tibetan Plateau, e.g. Sanjiang and West Kunlun, may be compared with the Troodos, which is regarded as a typical SSZ complex, having the same geochemical characteristics, i.e. high MgO and LREE-rich. The geochemistry, combined with the occurrence of boninite and adakite rocks, which are associated with subduction magmatism, suggest that ophiolites formed at different times in Qinghai-Tibetan Plateau, including Sanjiang and West Kunlun, are all SSZ-type ophiolites formed in a supra-subduction zone tectonic setting. (c) 2006 Elsevier Ltd. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	BONINITE SERIES ; MODEL
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000245262700004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38372]
专题	中国地质调查局
作者单位	China Geol Survey, Dev & Res Ctr, Beijing 100037, Peoples R China Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China China Univ Geosci, Minist Educ, Key Lab Lithospher Tecton Deep Level Proc & Explo, Beijing 100083, Peoples R China Minist Land & Resources, Informat Ctr, Beijing 1000812, Peoples R China Inst Geol, State Seismol Bur, Beijing 100029, Peoples R China Hubei Geoexplorat Bur, Exibei Inst Geol & Mineral Resources, Xiangfan 441003, Peoples R China
推荐引用方式 GB/T 7714	Qiu, RZ ,Zhou, S ,Li, TD ,et al. The tectonic-setting of ophiolites in the western Qinghai-Tibet Plateau, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2007,29(2-3 特刊 SI):215-228.
APA	Qiu, RZ .,Zhou, S .,Li, TD .,Deng, JF .,Mao, QH .,...&Cai, ZY .(2007).The tectonic-setting of ophiolites in the western Qinghai-Tibet Plateau, China.JOURNAL OF ASIAN EARTH SCIENCES,29(2-3 特刊 SI),215-228.
MLA	Qiu, RZ ,et al."The tectonic-setting of ophiolites in the western Qinghai-Tibet Plateau, China".JOURNAL OF ASIAN EARTH SCIENCES 29.2-3 特刊 SI(2007):215-228.