Forearc spreading cessation and backarc basin evolution: Insights from Mariana subduction system and geodynamic modeling

Cheng, Zihua1,2,3; Zhang, Fan1,2; Lin, Jian1,4,5; Ding, Weiwei3; Zhang, Xubo1,2

2023-09-20

10.1016/j.tecto.2023.229999

TECTONOPHYSICS   Impact Factor & Quartile

0040-1951

1879-3266

Evolutions of forearc and backarc spreading are related to processes of Subduction Initiation (SI). The unique evolution history of the Izu-Bonin-Mariana subduction system (IBM) provides a perfect example to investigate the relationships between forearc and backarc spreading with SI. The plate reconstruction model shows that the IBM initiated around 52 Ma, and the kinematics of the Pacific Plate changed around 47 Ma, providing horizontal velocity for forearc spreading cessation and backarc opening. Here, based on the plate motion history and the 2D thermomechanical models, we simulated the early stages of SI, as well as the evolutions of forearc and backarc spreading. We proposed a new model with a delayed convergence rate after similar to 5 Myr of SI, which can explain 1) the observed lithospheric forearc spreading cessation of the IBM; 2) the observed formation time of the Shikoku basin; and 3) the horizontally lying slab in the mantle transition zone after cessation of the backarc spreading of the IBM.

Fore arc Back arc Mariana subduction Geodynamic modeling

SCI

English

Others

Hainan Provin-cial Natural Science Foundation of China["131551KYSB20200021","421QN381"] ; Science and Technology Program of Guangzhou[202201010569] ; null[133244KYSB20180029] ; null[202201010221]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001055837400001

ELSEVIER

GEOSCIENCES

Web of Science

1.Chinese Acad Sci, Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou, Peoples R China
2.China Pakistan Joint Res Ctr Earth Sci CAS HEC, Islamabad, Pakistan
3.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou, Peoples R China
4.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
5.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA

Cheng, Zihua,Zhang, Fan,Lin, Jian,et al. Forearc spreading cessation and backarc basin evolution: Insights from Mariana subduction system and geodynamic modeling[J]. TECTONOPHYSICS,2023,863.

Cheng, Zihua,Zhang, Fan,Lin, Jian,Ding, Weiwei,&Zhang, Xubo.(2023).Forearc spreading cessation and backarc basin evolution: Insights from Mariana subduction system and geodynamic modeling.TECTONOPHYSICS,863.

Cheng, Zihua,et al."Forearc spreading cessation and backarc basin evolution: Insights from Mariana subduction system and geodynamic modeling".TECTONOPHYSICS 863(2023).