The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei-Qiong Crust Revealed through Seismic Ambient Noise Imaging

Pan, Mohan1,2; Yang, Ting2,3; Le, Ba Manh4; Dai, Yuhang5; Xiao, Han6

2024-03-01

10.3390/geosciences14030063

GEOSCIENCES   影响因子和分区

2076-3263

Magmatism on continental lithospheres induced by mantle plumes is more complex compared to oceanic intraplate volcanism owing to the heterogeneous nature of continental crustal and lithospheric structures. Substantial evidence points to the deep-oriented Hainan mantle plume beneath the Lei-Qiong region, the southernmost of the South China block. In this study, we present a detailed shear wave velocity model of the crust and uppermost mantle in the Lei-Qiong volcanic region, derived from 3-year seismic data (2016-2018) from 34 stations and the use of the ambient noise tomography method. An evident columnar low-velocity anomaly was imaged in the crust and uppermost mantle beneath the Wushi Sag (WSS), Beibu Gulf, potentially suggesting that the center of either one branch or the entirety of the Hainan mantle plume impacts the crust here. This low-velocity anomaly is overlaid by a local Moho deepening, indicative of underplating beneath the existing crust. The Maanling-Leihuling Volcanic Field (MLVF) in northern Hainan Island, previously considered the center of the hotspot, does not exhibit such distinct velocity anomalies. Instead, subtle lower crustal anomalies beneath the MLVF are linked with the upper mantle low-velocity zone beneath the WSS. Additionally, the high-conductivity bodies beneath the MLVF indicate lateral magma transport. Earthquake swarms and deep-seated seismic events beneath the WSS further support the presence of magmatic processes. This study indicates that in the Lei-Qiong region, the interaction of the continental crust with the mantle plume centered in the WSS results in magma exhibiting both vertical ascent and lateral migration, leading to a dual low-velocity shear wave pattern in the upper crust, which significantly influences the surface volcanic activity.

Hainan plume crustal structure intercontinental plume ambient noise surface wave

ESCI

英语

通讯

Geology

Geosciences, Multidisciplinary

WOS:001192644500001

MDPI

Web of Science

1.Harbin Inst Technol, Harbin 150001, Peoples R China
2.Southern Univ Sci & Technol, OBS Lab, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
3.Shanghai Sheshan Natl Geophys Observ, Shanghai 201602, Peoples R China
4.Vietnam Acad Sci & Technol VAST, Inst Geophys IGP, Hanoi 10072, Vietnam
5.Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, Southampton SO14 3ZH, England
6.German Geores Ctr GFZ, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany

Pan, Mohan,Yang, Ting,Le, Ba Manh,et al. The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei-Qiong Crust Revealed through Seismic Ambient Noise Imaging[J]. GEOSCIENCES,2024,14(3).

Pan, Mohan,Yang, Ting,Le, Ba Manh,Dai, Yuhang,&Xiao, Han.(2024).The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei-Qiong Crust Revealed through Seismic Ambient Noise Imaging.GEOSCIENCES,14(3).

Pan, Mohan,et al."The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei-Qiong Crust Revealed through Seismic Ambient Noise Imaging".GEOSCIENCES 14.3(2024).