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Lithium isotopic composition of low-temperature altered oceanic crust and its implications for Li cycling

文献类型：期刊论文

作者Liu, Haiyang1,5,6; Xue, Ying-Yu7,8,9; Sun, He10; Gu, Hai-Ou10; Tong, Fengtai2; Yao, Junhua1,5; Chen, Chen1,5; Xiao, Yilin11; Gao, Yongjun3; Sun, Wei-Dong1,4,5
刊名CHEMICAL GEOLOGY
出版日期2024-06-30
卷号656页码:12
关键词Li isotopes Low-temperature seafloor alteration Li flux IODP U1365 and U1368 Altered oceanic crust
ISSN号0009-2541
DOI10.1016/j.chemgeo.2024.122089
通讯作者Liu, Haiyang(hyliu@qdio.ac.cn) ; Zhang, Guoliang(zhangguoliang@qdio.ac.cn)
英文摘要To investigate the Li fluxes and its isotopic fractionation during low-temperature seafloor alteration, we present the Li isotope compositions of fifty fresh and altered basalts drilled from the Integrated Ocean Drilling Program (IODP) 329 Expedition Sites U1365 and U1368, which show different low-temperature (<150 degrees C) alteration styles and intensities (i.e., total volume of secondary minerals and degrees of elemental enrichment) with meager sedimentation rates (0.71 and 1.1 m/Myr, respectively). The fresh basalts (delta Li-7 vary from +2.7 to +6.4) show Li isotope compositions consistent with the published N-MORB (+3.5 +/- 1.0 parts per thousand), whereas the altered basalts exhibit considerably higher delta Li-7 values (+1.7 parts per thousand to +11.6 parts per thousand). Furthermore, their delta Li-7 values show positive correlations with alkali elements and loss on ignition and follow a mixing trend between a MORB-like endmember and a Li-rich seawater-derived endmember (+9.2 +/- 0.2 parts per thousand), which indicates the effects of low-temperature seafloor alteration on Li isotopic compositions. Based on previously reconstructed paleo-seawater Li isotope compositions, the Li isotopic fractionation scale between seawater and altered basalts is estimated (+12.6 parts per thousand and +18.0 parts per thousand for Sites U1365 and U1368, respectively), which further supports previous conclusions that the scale of Li isotope fractionation changes over time. A mass calculation suggests the upper limits of the Li-uptake fluxes during low-temperature seafloor alteration are 14.9 +/- 2.2 x 10(9) mol/year and 3.6 +/- 1.3 x 10(9) mol/year for Sites U1365 and U1368, respectively. In addition, our estimation shows the Li-uptake flux during low-temperature seafloor alteration in the Cretaceous is comparable to the total Li-input flux, whereas, in the Neogene, the Li-uptake flux during low-temperature seafloor alteration is much lower than that of the Li-input flux, which suggests a large diagenetic Li sink may be necessary to maintain the seawater Li budget balance if we assume the seawater Li concentration is roughly constant.
WOS关键词HYDROTHERMAL FLUXES ; BASALTS ; RIDGE ; SYSTEMATICS ; FRACTIONATION ; CONSTRAINTS ; EXCHANGE ; INSIGHTS ; HISTORY ; BORON
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[42230304] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020303] ; Scientific and Technological Innovation Program of the Laoshan Laboratory[LSKJ202204100] ; Postdoctoral innovation project of Shandong province ; Taishan Scholar Program of Shandong[tspd20230609] ; 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]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:001232095400001
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/185830]  
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; Zhang, Guoliang
作者单位1.Deep Sea Multidisciplinary Res Ctr, Laoshan Lab, Qingdao 266237, Peoples R China
2.Nanjing Univ, Int Ctr Isotope Effects Res, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
3.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
6.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
7.MNR, Key Lab Gold Mineralizat Proc & Resource Utilizat, Jinan, Peoples R China
8.Shandong Prov Key Lab Metallogen Geol Proc & Resou, Jinan, Peoples R China
9.Shandong Inst Geol Sci, Jinan 250013, Peoples R China
10.Hefei Univ Technol, Sch Resources & Environm Engn, Ore Deposit & Explorat Ctr, Hefei 230009, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Haiyang,Xue, Ying-Yu,Sun, He,et al. Lithium isotopic composition of low-temperature altered oceanic crust and its implications for Li cycling[J]. CHEMICAL GEOLOGY,2024,656:12.
APA Liu, Haiyang.,Xue, Ying-Yu.,Sun, He.,Gu, Hai-Ou.,Tong, Fengtai.,...&Zhang, Guoliang.(2024).Lithium isotopic composition of low-temperature altered oceanic crust and its implications for Li cycling.CHEMICAL GEOLOGY,656,12.
MLA Liu, Haiyang,et al."Lithium isotopic composition of low-temperature altered oceanic crust and its implications for Li cycling".CHEMICAL GEOLOGY 656(2024):12.

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来源：海洋研究所

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