Lithological research on the Purang mantle peridotite in western Yarlung-Zangbo suture zone in Tibet

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	Lithological research on the Purang mantle peridotite in western Yarlung-Zangbo suture zone in Tibet
	Xu, XZ (Xu XiangZhen); Yang, JS (Yang JingSui); Guo, GL (Guo GuoLin); Li, JY (Li JinYang)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:11 特刊 SI 页码:3179-3196
关键词	Mantle peridotite Ophiolite Purang Yarlung-Zangbo suture zone
ISSN号	1000-0569
英文摘要	The Purang ophiolite in the Yarlung-Zangbo suture zone in Tibet is characterized by containing a large mantle peridotite massif of ca. 600km(2) in area. The mantle peridotite consists of dominant harzburgite, minor lherzolite and dunite, and contains some dikes or veins of olive chnopyroxenite, gabbro and diabase in the massif. The Fo values of olivine in mantle peridotite vary in the range of 90 similar to 93, and in which relatively higher Fo values of olivine are from the inclusions within other minerals in the rocks. The orthopyroxenes in the rocks are enstatite (En 88 similar to 90), and the clinopyroxenes are endiopside and diopside with low Al(2)O(3) (0.48% similar to 3.96%) contents and high Mg(#) (91 similar to 96) values. Chrome spinels have various Cr(#) values from 18 to 69, and in which aluminum-rich spinels are from harzburgite and Iherzolite, but chromium-rich spinels from dunite. In olivine clinopyroxenites, olivines have uniformly low Fo values of around 88 and orthopyroxenes have En values around 87. Clinopyroxenes in the rocks are dominated by diopside, and chrome spinels contain both aluminum-rich and chromium-rich types with Cr(#) values varied in the range of 45 similar to 69. The mantle peridotite and olivine chnopyroxenite in Purang have the similar distribution patterns of rare-earth elements and trace elements, characterized by their slightly enrichment in LREE and weakly depleted in Eu, relatively lower content of large ion lithophile element (LILE), and either depleted or enriched in high filed-strength element (HFSE). These features imply a depleted mantle source, which were overlapped by fluid alteration in a subduction zone. It concludes that the Purang ophiohte formed in a MOR setting and was modified by fluids in a SSZ setting, similar to the Luobusa ophiolite in the eastern Yarlung-Zangbo suture zone.
学科主题	火成岩岩石学
WOS关键词	XIGAZE OPHIOLITE TIBET ; SOUTHERN TIBET ; OCEANIC LITHOSPHERE ; SPINEL-PERIDOTITES ; YUNGBWA OPHIOLITE ; STRUCTURE BENEATH ; SUPRA-SUBDUCTION ; ULTRAMAFIC ROCKS ; TROODOS MASSIF ; GEOCHEMISTRY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000297822900003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39411]
专题	中国地质调查局
作者单位	E China Inst Technol, State Key Lab Breeding Base Nucl Resources & Envi, Nanchang 330013, Peoples R China
推荐引用方式 GB/T 7714	Xu, XZ ,Yang, JS ,Guo, GL ,et al. Lithological research on the Purang mantle peridotite in western Yarlung-Zangbo suture zone in Tibet[J]. ACTA PETROLOGICA SINICA,2011,27(11 特刊 SI):3179-3196.
APA	Xu, XZ ,Yang, JS ,Guo, GL ,&Li, JY .(2011).Lithological research on the Purang mantle peridotite in western Yarlung-Zangbo suture zone in Tibet.ACTA PETROLOGICA SINICA,27(11 特刊 SI),3179-3196.
MLA	Xu, XZ ,et al."Lithological research on the Purang mantle peridotite in western Yarlung-Zangbo suture zone in Tibet".ACTA PETROLOGICA SINICA 27.11 特刊 SI(2011):3179-3196.