Mantle heterogeneity caused by trapped water in the Southwest Basin of the South China Sea

Tian, Jinyu1; Ma, Zhitu2; Lin, Jian1,3; Xu, Min3; Yu, Xun2; Le, Ba Manh1; Zhang, Xubo3; Zhang, Fan3; Guo, Laiyin1

2023-05-11

10.1038/s41467-023-38385-w

NATURE COMMUNICATIONS   影响因子和分区

2041-1723

["Water is the most common volatile component inside the Earth. A substantial amount of water can be carried down to the interior of the Earth by subducting plates. However, how the subducted water evolves after the subducting slab breaks off remains poorly understood. Here we use the data from a passive seismic experiment using ocean bottom seismometers (OBSs) together with the land stations to determine the high-resolution, three-dimensional seismic structure of the Southwest Sub-basin (SWSB) of the South China Sea (SCS). At depths below 40 km, the mantle shear velocity (Vsv) beneath the northern side of the SWSB is similar to that of the conventional oceanic pyrolite mantle, but roughly 3% shear-velocity reduction is found beneath the southern side of the SWSB. Results of thermal dynamic modeling reveal that the observed shear-velocity reduction could be explained by the presence of 150-300 ppm of water and 5-10% of lower continental crust. The inferred high-water content at the southern side of the SWSB is consistent with a model in which the Proto-SCS plate subducted southward prior to and during the formation of the SCS basin, releasing water into the upper mantle of the SWSB.","This study suggests that the observed shear-velocity reduction beneath the southern side of the Southwest Sub-basin (SWSB) of the South China Sea (SCS) may be due to the presence of 150-300 ppm of water and 5-10% of lower continental crust."]

SCI

英语

NI论文

第一 ; 通讯

National Natural Science Foundation of China["41890813","91858207","41976064","91628301","92258303","131551KYSB20200021","133244KYSB20180029"] ; International Exchange Program for Graduate Students of Tongji University[42074051] ; State Key Laboratory of Marine Geology, Tongji University[42206070] ; Shenzhen Science and Technology Innovation Commission["201902056","MGK202306"] ; Chinese Academy of Sciences["JCYJ20220818100417038","KCXFZ20211020174803005","Y4SL021001"] ; Hainan Provincial Natural Science Foundation of China[421QN381] ; Science and Technology Program of Guangzhou[202201010221]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000992465700008

NATURE PORTFOLIO

2-s2.0-85159176573

Web of Science

1.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
2.Tongji Univ, Sch Ocean & Earth Sci, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
3.Chinese Acad Sci, South China Sea Inst Oceanol, Innovat Acad South China Sea Ecol & Environm Engn, Key Lab Ocean & Marginal Sea Geol, Guangzhou 511458, Peoples R China

Tian, Jinyu,Ma, Zhitu,Lin, Jian,et al. Mantle heterogeneity caused by trapped water in the Southwest Basin of the South China Sea[J]. NATURE COMMUNICATIONS,2023,14(1).

Tian, Jinyu.,Ma, Zhitu.,Lin, Jian.,Xu, Min.,Yu, Xun.,...&Guo, Laiyin.(2023).Mantle heterogeneity caused by trapped water in the Southwest Basin of the South China Sea.NATURE COMMUNICATIONS,14(1).

Tian, Jinyu,et al."Mantle heterogeneity caused by trapped water in the Southwest Basin of the South China Sea".NATURE COMMUNICATIONS 14.1(2023).