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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

文献类型：期刊论文

作者Liu, Haiyang2,3; Xue, Ying-Yu2,3; Yang, Tinggen1,2,3; Jin, Xin2,3; You, Chen-Feng4; Lin, Chiou-Ting4; Sun, Wei-Dong1,2,3; Deng, Jianghong2,3
刊名LITHOS
出版日期2022-08-01
卷号422页码:21
关键词Mariana forearc Metabasites Slab dehydration Element cycling B isotopes IODP expedition 366
ISSN号0024-4937
DOI10.1016/j.lithos.2022.106730
通讯作者Liu, Haiyang(hyliu@qdio.ac.cn) ; Deng, Jianghong(jhdeng0507@163.com)
英文摘要To 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.
资助项目National 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研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000807717600001
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/179476]  
专题海洋研究所_深海极端环境与生命过程研究中心
通讯作者Liu, Haiyang; Deng, Jianghong
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
3.Deep Sea Multidisciplinary Res Ctr, Qingdao Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
4.Natl Cheng Kung Univ, Dept Earth Sci, Tainan, Taiwan
推荐引用方式
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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来源：海洋研究所

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