Numerical simulation of subduction-induced molten plume: Destruction of overriding plate and its dynamic topographic responses

MA Fangfang; LOU Da; DAI Liming; LI Sanzhong; DONG Hao; TAO Jianli; LI Fakun; WANG Liangliang; LIU Ze

doi:10.16562/j.cnki.0256-1492.2019040102

Marine Geology & Quaternary Geology > 2019 > 39(5): 186-196. > DOI: 10.16562/j.cnki.0256-1492.2019040102

MA Fangfang, LOU Da, DAI Liming, LI Sanzhong, DONG Hao, TAO Jianli, LI Fakun, WANG Liangliang, LIU Ze. Numerical simulation of subduction-induced molten plume: Destruction of overriding plate and its dynamic topographic responses[J]. Marine Geology & Quaternary Geology, 2019, 39(5): 186-196. DOI: 10.16562/j.cnki.0256-1492.2019040102

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Numerical simulation of subduction-induced molten plume: Destruction of overriding plate and its dynamic topographic responses

MA Fangfang^1,2,,
LOU Da³,
DAI Liming^1,2, ,,
LI Sanzhong^1,2,
DONG Hao^1,2,
TAO Jianli^1,2,
LI Fakun^1,2,
WANG Liangliang^1,2,
LIU Ze^1,2

1.
Key Lab of Submarine Geosciences and Prospecting Techniques, MOE, Institute for Advanced Ocean Study, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Laboratory for Marine Geology and Environment, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
3.
PetroChina Dagang Oilfield Company, Tianjin 300280, China

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Received Date: March 31, 2019
Revised Date: April 18, 2019
Available Online: November 06, 2019

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Abstract

Abstract

In the process of oceanic crust subduction, with the increase in temperature and pressure and the difference in density, the subduction-induced molten plume will rise rapidly and act on the lithospheric mantle bottom of the overriding plate, which may lead to the decrease in the lithospheric damage and the drastic change of surface morphology. This process is similar to the destruction of the lithosphere caused by mantle plume. So far, there have been little studies on the formation of subduction-induced molten plumes and their damage to the lithosphere, especially on the responses of surface dynamic topographic changes to the deep destruction. Based on the conservation equations of matter, momentum and energy, the I2VIS finite difference method is adopted by the authors to calculate and reveal the partial melting of the subducted oceanic crust at different times and depths under given material parameters and boundary conditions. The process of forming a subduction-induced molten plume is obtained, and then the process of molten plume-lithosphere interactions is further simulated, and the response of shallow topographic changes are analyzed. The numerical simulation results show that in the process of oceanic plate subduction, the composite molten plumes formed by subducted terrigenous sediment and oceanic crust eroded the bottom of the lithosphere longitudinally, and resulted in lithospheric thinning. During the transverse erosion of the molten plumes, the melting range of the lithospheric mantle increases up to 300 km. In terms of geomorphic change, plate subduction results in compression deformation of the continental front, which may reach 300 km. At the same time, the erosion of the molten plumes associated with subduction to the bottom of the lithospheric mantle is gradually strengthened, and the dynamic topographic changes increased, while uplifting continued, and ultimately reached a figure of 4 km. The variation range of dynamic topography is limited to 300 km, which is consistent with the damage range of lithospheric mantle.
- subduction,
- subduction-induced molten plume,
- lithospheric destruction,
- dynamic topography,
- numerical simulation

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References (58)

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Numerical simulation of subduction-induced molten plume: Destruction of overriding plate and its dynamic topographic responses