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Fluid-rock interactions at shallow depths in subduction zone: Insights from trace elements and B isotopic composition of metabasites from the Mariana forearc
Liu, Haiyang1,2; Xue, Ying-Yu1,2; Yang, Tinggen1,2,4; Jin, Xin1,2; You, Chen-Feng3; Lin, Chiou-Ting3; Sun, Wei-Dong1,2,4; Deng, Jianghong1,2
2022-08-01
Source PublicationLITHOS
ISSN0024-4937
Volume422Pages:21
Corresponding AuthorLiu, Haiyang(hyliu@qdio.ac.cn) ; Deng, Jianghong(jhdeng0507@163.com)
AbstractTo reveal the spatial variations of slab-derived fluids and to trace the in-situ dehydration in the shallow sub-duction zone, we investigated the petrography, mineral chemistry, and whole-rock B isotopes of metabasites that were recovered from the Fantangisna and Asut Tesoru serpentinite mud volcanoes and originated from the shallow subduction channel at the forearc of the Mariana subduction zone. The alteration mineral assemblages in the investigated metabasites suggest zeolite-to prehnite-pumpellyite-facies metamorphism and lawsonite-blueschist facies metamorphism beneath Fantangisna and Asut Tesoru seamounts, respectively. The fluid mo-bile elements (e.g., B, As, Sb, Pb) are preserved in the low grade metamorphic phyllosilicate minerals (e.g., glauconite, pumpellyite, celadonite), thus fixing the B concentrations of the subducted oceanic crust during shallow subduction (< 18 km). Both B concentrations (16.7 to 43.9 mu g/g) and delta B-11 values (-5.0 to +3.2 parts per thousand ) of the investigated metabasites are significantly higher than fresh normal mid-ocean ridge basalts (N-MORB) and ocean island basalts (OIB), and are generally comparable to the uppermost altered oceanic slab. Notably, the recovered metabasites from the Mariana forearc exhibit a decreasing trend in 811B values with increasing distance to the trench from Fantangisna (62 km) through Asut Tesoru (72 km) to South Chamorro (78 km) Seamounts. This trend together with Rayleigh dehydration modeling indicate that the 11B-enriched aqueous fluids were released from the subducting slab during prograde metamorphic dehydration. The estimated B isotopic compositions of the slab-derived fluids released at arc magma genesis depths are generally comparable to that of the Mariana arc lavas. However, the fluids released by dehydration of subducted sediments at shallow depths should be characterized by lower delta B-11 values than fluids released from the slab at depths of magma genesis beneath the island arc. Then, the recycling of the hydrated forearc mantle is necessary to explain the high 811B values of the Mariana arc lavas. While, the variable B isotope compositions of Mariana arc lavas should be controlled by the different ratios of sediment/AOC ratios.
KeywordMariana forearc Metabasites Slab dehydration Element cycling B isotopes IODP expedition 366
DOI10.1016/j.lithos.2022.106730
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41903006] ; National Natural Science Foundation of China[41803002] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB42020303] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDA22050103] ; China Postdoctoral Science Foundation[2019M652497] ; China Postdoctoral Science Foundation[2020T130656] ; postdoctoral innovation project of Shandong province ; Taishan Scholar Program of Shandong[ts201712075] ; Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS07]
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000807717600001
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/179477
Collection深海极端环境与生命过程研究中心
Corresponding AuthorLiu, Haiyang; Deng, Jianghong
Affiliation1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
2.Deep Sea Multidisciplinary Res Ctr, Qingdao Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
3.Natl Cheng Kung Univ, Dept Earth Sci, Tainan, Taiwan
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationChinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res
Corresponding Author AffilicationChinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res
Recommended Citation
GB/T 7714
Liu, Haiyang,Xue, Ying-Yu,Yang, Tinggen,et al. Fluid-rock interactions at shallow depths in subduction zone: Insights from trace elements and B isotopic composition of metabasites from the Mariana forearc[J]. LITHOS,2022,422:21.
APA Liu, Haiyang.,Xue, Ying-Yu.,Yang, Tinggen.,Jin, Xin.,You, Chen-Feng.,...&Deng, Jianghong.(2022).Fluid-rock interactions at shallow depths in subduction zone: Insights from trace elements and B isotopic composition of metabasites from the Mariana forearc.LITHOS,422,21.
MLA Liu, Haiyang,et al."Fluid-rock interactions at shallow depths in subduction zone: Insights from trace elements and B isotopic composition of metabasites from the Mariana forearc".LITHOS 422(2022):21.
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