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Petrology and geochemistry of serpentinized peridotites from Hahajima Seamount in Izu-Bonin forearc region

文献类型：期刊论文

作者Wu, Tuoyu4; Tian, Liyan2,3; Gao, Jinwei2,3; Dong, Yanhui1
刊名ACTA OCEANOLOGICA SINICA
出版日期2019-11-01
卷号38期号:11页码:99-110
ISSN号0253-505X
关键词Hahajima Seamount serpentinized peridotites IBM forearc seamounts fluid-mobile elements
DOI10.1007/s13131-019-1469-x
英文摘要Serpentinites, which contain up to 13 wt% of water, are important reservoirs for chemical recycling in subduction zones. In the past two decades, forearc mantle serpentinites were identified in different locations around the world. Here, we present petrology and whole rock chemistry of ultramafic and mafic rocks dredged from the Hahajima Seamount, which is located 24-40 km west to the junction of the Izu-Bonin Trench and the Mariana Trench. Nearly all the collected samples are extensively hydrated, and olivine grains in ultramafic rocks are replaced by serpentine minerals, with only one sample preserving remaining trace of orthopyroxene. Our new results show that the Hahajima serpentinized peridotite samples are all MgO-rich (similar to 42 wt%), but have low contents in Al2O3, CaO, rare earth and high field strength elements, which is consistent with the overall depleted character of their mantle protoliths. Model calculations indicate that these Hahajima peridotite samples were derived from 10%-25% partial melting of the presumed fertile mantle source, which is generally lower than those of peridotites from Torishima Forearc Seamount, Conical Seamount and South Chamorro Seamount (mostly >25%). All the serpentinites from these four forearc seamounts show strong enrichment in fluid-mobile and lithophile elements (Li, Sr, Pb and U). In details, Hahajima Seamount serpentinites do not have obvious enrichment in Cs and Rb, and display remarkably high abundances of U. These observations indicate that the serpentinization of Hahajima peridotites occurred by addition of seawater or low temperature seawater-derived hydrothermal fluid, without or with little contribution from slab-derived fluids. The geochemical signature of serpentinites from Hahajima Seamount could be interpreted as the result of the combination of extensive partial melting and subsequent percolation of seawater through the mantle wedge.
WOS关键词FLUID-MOBILE ELEMENTS ; SUBDUCTION-ZONE ; BACK-ARC ; PROCESSES BENEATH ; DEPLETED MANTLE ; MELT EXTRACTION ; TRACE-ELEMENTS ; MARIANA ARC ; MUD VOLCANO ; SYSTEMATICS
资助项目National Natural Science Foundation of China[41506047] ; National Natural Science Foundation of China[41876044] ; National Natural Science Foundation of China[91858214] ; Chinese Academy of Sciences' Strategic Priority Research Program Grant[XDB06030103] ; Chinese Academy of Sciences' Strategic Priority Research Program Grant[XDB06030204]
WOS研究方向Oceanography
语种英语
出版者SPRINGER
WOS记录号WOS:000496697100011
资助机构National Natural Science Foundation of China ; Chinese Academy of Sciences' Strategic Priority Research Program Grant
源URL[http://ir.idsse.ac.cn/handle/183446/7423]  
专题深海科学研究部_深海地质与地球化学研究室
深海科学研究部_深海地球物理与资源研究室
通讯作者Tian, Liyan
作者单位1.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China
2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol, Qingdao 266237, Shandong, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
4.Beijing Maiqin Nengyuan Jishu Fuwu Co Ltd, Beijing 100004, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Tuoyu,Tian, Liyan,Gao, Jinwei,et al. Petrology and geochemistry of serpentinized peridotites from Hahajima Seamount in Izu-Bonin forearc region[J]. ACTA OCEANOLOGICA SINICA,2019,38(11):99-110.
APA Wu, Tuoyu,Tian, Liyan,Gao, Jinwei,&Dong, Yanhui.(2019).Petrology and geochemistry of serpentinized peridotites from Hahajima Seamount in Izu-Bonin forearc region.ACTA OCEANOLOGICA SINICA,38(11),99-110.
MLA Wu, Tuoyu,et al."Petrology and geochemistry of serpentinized peridotites from Hahajima Seamount in Izu-Bonin forearc region".ACTA OCEANOLOGICA SINICA 38.11(2019):99-110.

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