Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration

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	Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration
	Zeng, Zhigang 1; Wang, Qiaoyun 1; Wang, Xiaomei 1,2; Chen, Shuai 1,2; Yin, Xuebo 1; Li, Zhaoxue 1
刊名	JOURNAL OF EARTH SYSTEM SCIENCE
	2012-10-01
卷号	121 期号:5 页码:1317-1336
关键词	Abyssal peridotite magma source seawater alteration Southwest Indian Ridge near 65 degrees E
ISSN号	0253-4126
通讯作者	Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China.
英文摘要	The geochemical characteristics of abyssal peridotite samples from one dredge station (27 degrees 49.74'S, 65 degrees 02.14'E, water depth 4473 m) on the super slow-spreading Southwest Indian Ridge (SWIR) near 65 degrees E were investigated. Abyssal peridotites recovered from this site were comprised mainly of lizardite, chlorite, carbonate and magnetite with minor amounts of talc, pyroxene phenocrysts and sparse olivines. Serpentinites exhibit talc veins and major serpentine derived from serpentinization with relict olivine granuloblasts. Olivine grains in serpentinites display exsolution lamellae, indicating the occurrence of talc reduction or decompression during seawater-rock interaction. Pyroxene shows clear cleavage in two directions, with clinopyroxene or orthopyroxene exsolution lamellae. By contrast, bulk rock trace element patterns of serpentinites reveal depletion in most incompatible elements, similarly to the depleted mid-ocean ridge basalt mantle composition, indicating that the SWIR peridotites originated from a depleted mantle source magma and have experienced partial melting. Meanwhile, Rb, Ba, U, Pb, Sr, Li anomalies and the Ce/Pb ratio suggest that these serpentinites have been strongly altered by seawater.
学科主题	Geosciences, Multidisciplinary ; Multidisciplinary Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000311002300015
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/12504]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zeng, Zhigang,Wang, Qiaoyun,Wang, Xiaomei,et al. Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration[J]. JOURNAL OF EARTH SYSTEM SCIENCE,2012,121(5):1317-1336.
APA	Zeng, Zhigang,Wang, Qiaoyun,Wang, Xiaomei,Chen, Shuai,Yin, Xuebo,&Li, Zhaoxue.(2012).Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration.JOURNAL OF EARTH SYSTEM SCIENCE,121(5),1317-1336.
MLA	Zeng, Zhigang,et al."Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration".JOURNAL OF EARTH SYSTEM SCIENCE 121.5(2012):1317-1336.