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Petrology and geochemistry of serpentinized peridotites from Hahajima Seamount in Izu-Bonin forearc region
Wu, Tuoyu1; Tian, Liyan2,3; Gao, Jinwei2,3; Dong, Yanhui4
2019-11-01
Source PublicationACTA OCEANOLOGICA SINICA
ISSN0253-505X
Volume38Issue:11Pages:99-110
AbstractSerpentinites, 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.
KeywordHahajima Seamount serpentinized peridotites IBM forearc seamounts fluid-mobile elements
DOI10.1007/s13131-019-1469-x
Indexed BySCI ; SCI
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences' Strategic Priority Research Program Grant
Language英语
Funding ProjectNational 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 KeywordFLUID-MOBILE ELEMENTS ; SUBDUCTION-ZONE ; BACK-ARC ; PROCESSES BENEATH ; DEPLETED MANTLE ; MELT EXTRACTION ; TRACE-ELEMENTS ; MARIANA ARC ; MUD VOLCANO ; SYSTEMATICS
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000496697100011
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/7424
Collection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
Corresponding AuthorTian, Liyan
Affiliation1.Beijing Maiqin Nengyuan Jishu Fuwu Co Ltd, Beijing 100004, Peoples R China
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol, Qingdao 266237, Shandong, Peoples R China
4.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China
Corresponding Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
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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