气候变化领域集成服务门户(CCPortal): Oceanization of the subcontinental lithospheric mantle recorded in the Yunzhug ophiolite, Central Tibetan Plateau

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DOI	10.1016/j.lithos.2020.105612
	Oceanization of the subcontinental lithospheric mantle recorded in the Yunzhug ophiolite, Central Tibetan Plateau
	Huang, Xiao-Xiao; Shi, Ren-Deng; Gong, Xiao-Han; Huang, Qi-Shuai; Griffin, William L.; O'Reilly, Suzanne Y.; Chen, Sheng-Sheng
通讯作者	Shi, RD (通讯作者)
发表日期	2020
ISSN	0024-4937
EISSN	1872-6143
卷号	370
英文摘要	The Yunzhug ophiolite, in the middle sector of the Shiquanhe-Namco ophiolite belt (SNOB), has generally been interpreted as a remnant of the Neo-Tethyan oceanic lithosphere, composed of mantle peridotites and mafic-ultramafic magmatic rocks. However, detailed study reveals that the mantle parts are ultra-depleted peridotites with affinities to subcontinental lithospheric mantle (SCLM), including major harzburgites and minor dunites. The olivine in dunite has the highest Fo values, up to 93.8, and the harzburgite is divided into three groups. Olivine included in Opx in Group I has Fo 92.4-93.3, close to the dunite. In Group II, olivine in the peridotites has Fo between 91.8 and 92.5. Group III olivine occurs in vein-like clusters with small grains of Cpx and Spl within Group II peridotites, and has the lowest Fo, mainly at 91.5 and the Cr# of Spl as low as 50 with MOR-like features. The chemical composition of Opx is consistent with that from on-craton garnet lherzolites, while the Cpx displays lower Na2O and Al2O3, and elevated Cr2O3 contents with an embryonic oceanic-crust affinity. The high Mg# values and low( 187)Os/Os-188 (0.11301-0.12374; T-RD 2.30 Ga - 0.54Ga) of whole rocks and the high Fo in 01 of Group I and II suggest that the peridotites originated from ancient SCLM. The fine-grained mineral clusters in Group III reflect modification of the peridotite massif, representing the oceanization process during the initial rifting of the Gondwana continent. (C) 2020 Elsevier B.V. All lights reserved.
关键词	OSMIUM ISOTOPIC COMPOSITION OCEANIC UPPER-MANTLE NUJIANG SUTURE ZONE RE-OS SYSTEMATICS MELT EXTRACTION RE-187-OS-187 SYSTEMATICS ULTRAMAFIC XENOLITHS ABYSSAL PERIDOTITES SPINEL EVOLUTION
英文关键词	Yunzhug ophiolite; OCT-type; SCLM; Tethyan Ocean; Tibetan plateau
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000558896300007
来源期刊	LITHOS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259841
推荐引用方式 GB/T 7714	Huang, Xiao-Xiao,Shi, Ren-Deng,Gong, Xiao-Han,et al. Oceanization of the subcontinental lithospheric mantle recorded in the Yunzhug ophiolite, Central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,370.
APA	Huang, Xiao-Xiao.,Shi, Ren-Deng.,Gong, Xiao-Han.,Huang, Qi-Shuai.,Griffin, William L..,...&Chen, Sheng-Sheng.(2020).Oceanization of the subcontinental lithospheric mantle recorded in the Yunzhug ophiolite, Central Tibetan Plateau.LITHOS,370.
MLA	Huang, Xiao-Xiao,et al."Oceanization of the subcontinental lithospheric mantle recorded in the Yunzhug ophiolite, Central Tibetan Plateau".LITHOS 370(2020).