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Potassium isotope evidence for subducted upper and lower oceanic crust in ocean island basalt sources

文献类型：期刊论文

作者Liu, Haiyang3; Xue, Ying-Yu7,8; Geldmacher, Joerg2; Hoernle, Kaj1,2; Wiechert, Uwe6; An, Shichao5; Gu, Hai-Ou4; Sun, He4; Tian, Fanfan10; Li, Xiaoqiang12
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2024-11-15
卷号646页码:13
关键词Stable potassium and oxygen isotopes OIB Mantle heterogeneity Madeira Altered upper and lower oceanic crust
ISSN号0012-821X
DOI10.1016/j.epsl.2024.119015
通讯作者Liu, Haiyang(hyliu@qdio.ac.cn) ; Sun, Wei-Dong(weidongsun@qdio.ac.cn)
英文摘要The Madeira mantle plume is proposed to contain a complete package of recycled oceanic lithosphere. It has not been possible, however, to establish if both lower oceanic crust and peridotitic lithospheric mantle are present within the Madeira magma source. This study reports potassium (K) and oxygen isotope data of lavas from the Madeira Archipelago, which show that delta K-41 (-0.50 +/- 0.06 parts per thousand to -0.31 +/- 0.01 parts per thousand) correlates with Sr-Nd-Pb-Hf isotopic compositions, confirming the incorporation of recycled crustal material. The increase in delta K-41 from Madeira's early shield stage lavas (-0.50 +/- 0.06 parts per thousand to -0.40 +/- 0.05 parts per thousand) to the subsequent post-erosional stage lavas (-0.34 +/- 0.04 parts per thousand to -0.31 +/- 0.01 parts per thousand) is consistent with the mantle source becoming progressively depleted in recycled upper oceanic crust (converted to eclogite or pyroxenite) through melt extraction with decreasing age. The post-erosional lavas, however, require a source with higher delta K-41 values than in depleted peridotitic lithospheric mantle. Modeling demonstrates that during dehydration of high-temperature altered lower oceanic crust, the initial heavy K isotopic signature is preserved, consistent with the high delta K-41 values of the post-erosional lavas being derived from hydrothermally-altered lower oceanic crust in the Madeira plume source. Consequently, K isotopes provide direct evidence that ocean island magma sources can contain both upper and lower recycled oceanic crust. This study provides important constraints on the cause of the temporal changes in geochemical composition of ocean island basalts, the origin of mantle heterogeneity and the recycling of K through subduction zones and the deep mantle.
WOS关键词MAGMATIC DIFFERENTIATION ; GEOCHEMICAL EVOLUTION ; MANTLE PLUMES ; FRACTIONATION ; EM ; CIRCULATION ; ECLOGITES ; SEAMOUNTS ; SECTION ; ORIGIN
资助项目National Natural Science Foundation of China[42373003] ; National Natural Science Foundation of China[92258303] ; National Natural Science Foundation of China[42221005] ; National Natural Science Foundation of China[42322302] ; National Natural Science Foundation of China[42249583] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020303] ; Scientific and Technological Innovation Program of the Laoshan Laboratory[LSKJ202204100] ; Taishan Scholar Program of Shandong[tspd20230609] ; Fundamental research project of Shandong Province[ZFJH202308] ; State Key Laboratory of Marine Geology, Tongji University[MGK202305] ; State Key Laboratory for Mineral Deposits Research, Nanjing University[2023-LAMD-K05] ; Open Research Project from the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences[GPMR202313] ; GEOMAR Helmholtz Center for Ocean Research Kiel ; German Research Foundation (DFG)
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:001321932800001
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/199315]  
专题海洋研究所_海洋环流与波动重点实验室
通讯作者Liu, Haiyang; Sun, Wei-Dong
作者单位1.Univ Kiel, Inst Geosci, D-24118 Kiel, Germany
2.GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany
3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Key Lab Ocean Observat & Forecasting, Qingdao 266071, Peoples R China
4.Hefei Univ Technol, Ore Deposit & Explorat Ctr, Hefei 230009, Peoples R China
5.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
6.Free Univ Berlin, Inst Geol Sci, D-12249 Berlin, Germany
7.Shandong Inst Geol Sci, Jinan 250013, Peoples R China
8.MNR, Shandong Prov Key Lab Metallogen Geol Proc & Resou, Key Lab Gold Mineralizat Proc & Resource Utilizat, Jinan 250013, Peoples R China
9.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
10.Laoshan Lab, Ocean Sci & Interdisciplinary Frontiers, Qingdao 266237, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Haiyang,Xue, Ying-Yu,Geldmacher, Joerg,et al. Potassium isotope evidence for subducted upper and lower oceanic crust in ocean island basalt sources[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,646:13.
APA Liu, Haiyang.,Xue, Ying-Yu.,Geldmacher, Joerg.,Hoernle, Kaj.,Wiechert, Uwe.,...&Sun, Wei-Dong.(2024).Potassium isotope evidence for subducted upper and lower oceanic crust in ocean island basalt sources.EARTH AND PLANETARY SCIENCE LETTERS,646,13.
MLA Liu, Haiyang,et al."Potassium isotope evidence for subducted upper and lower oceanic crust in ocean island basalt sources".EARTH AND PLANETARY SCIENCE LETTERS 646(2024):13.

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来源：海洋研究所

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