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地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: Luo, T. and Leng, W. (2021). Thermal structure of continental subduction zone: high temperature caused by the removal of the preceding oceanic slab. Earth Planet. Phys., 5(3), 1–6doi: 10.26464/epp2021027

doi: 10.26464/epp2021027

SOLID EARTH: GEODYNAMICS

Thermal structure of continental subduction zone: high temperature caused by the removal of the preceding oceanic slab

1. 

Laboratory of Seismology and Physics of Earth’s Interior; School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

2. 

Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Beijing 100049, China

Corresponding author: Wei Leng, wleng@ustc.edu.cn

Received Date: 2021-01-26
Web Publishing Date: 2021-02-01

The thermal structure of the continental subduction zone can be deduced from high-pressure and ultra-high-pressure rock samples or numerical simulation. However, petrological data indicate that the temperature of subducted continental plates is generally higher than that derived from numerical simulation. In this paper, a two-dimensional kinematic model is used to study the thermal structure of continental subduction zones, with or without a preceding oceanic slab. The results show that the removal of the preceding oceanic slab can effectively increase the slab surface temperature of the continental subduction zone in the early stage of subduction. This can sufficiently explain the difference between the cold thermal structure obtained from previous modeling results and the hot thermal structure obtained from rock sample data.

Key words: thermal structure; continental subduction zone; slab breakoff; numerical model

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Thermal structure of continental subduction zone: high temperature caused by the removal of the preceding oceanic slab

Ting Luo, Wei Leng