Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision

Pengpeng Huangfu; Yuejun Wang; Zhonghai Li; Weiming Fan; Yan Zhang

doi:10.1007/s12583-016-0701-9

Volume 27 Issue 5

Sep 2016

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Journal of Earth Science > 2016 > 27(5): 727-739.

Pengpeng Huangfu, Yuejun Wang, Zhonghai Li, Weiming Fan, Yan Zhang. Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision. Journal of Earth Science, 2016, 27(5): 727-739. doi: 10.1007/s12583-016-0701-9

Citation:

Pengpeng Huangfu, Yuejun Wang, Zhonghai Li, Weiming Fan, Yan Zhang. Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision. Journal of Earth Science, 2016, 27(5): 727-739. doi: 10.1007/s12583-016-0701-9

Citation:

Pengpeng Huangfu, Yuejun Wang, Zhonghai Li, Weiming Fan, Yan Zhang. Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision. Journal of Earth Science, 2016, 27(5): 727-739. doi: 10.1007/s12583-016-0701-9

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Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision

doi: 10.1007/s12583-016-0701-9

Pengpeng Huangfu^{1, 2, 3},
Yuejun Wang^{3, 4},
Zhonghai Li²,
Weiming Fan⁴,
Yan Zhang^{3
,
,}

1.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
2.
Key Laboratory of Computational Geodynamics, College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
3.
School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou, 510275, China
4.
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China

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Corresponding author: Yan Zhang, shanshizhang@sohu.com
Received Date: 28 Jul 2015
Accepted Date: 26 Apr 2016
Publish Date: 01 Oct 2016

Abstract

Abstract

2D thermo-mechanical models are constructed to investigate the effects of oceanic and continental crustal eclogitization on plate dynamics at three successive stages of oceanic subduction, slab breakoff, and continental subduction. Crustal eclogitization directly increases the average slab density and accordingly the slab pull force, which makes the slab subduct deeply and steeply. Numerical results demonstrate that the duration time from initial continental collision to slab breakoff largely depends on the slab pull force. Specifically, eclogitization of subducted crust can greatly decrease the duration time, but increase the breakoff depth. The detachment of oceanic slab from the pro-continental lithosphere is accompanied with obvious exhumation of the subducted continental crust and a sharp uplift of the collision zone in response to the disappearance of downward drag force and the induced asthenospheric upwelling, especially under the condition of no or incomplete crustal eclogitization. During continental subduction, the slab dip angle is strongly correlated with eclogitization of subducted continental lower crust, which regulates the slab buoyancy nature. Our model results can provide several important implications for the Himalayan-Tibetan collision zone. For example, it is possible that the lateral variations in the degree of eclogitization of the subducted Indian crust might to some extent contribute to the lateral variations of subduction angle along the Himalayan orogenic belt. Moreover, the accumulation of highly radiogenic sediments and upper continental crustal materials at the active margin in combination with the strong shear heating due to continuous continental subduction together cause rising of isotherms in the accretionary wedge, which facilitate the development of crustal partial melting and metamorphism.
- numerical modeling,
- crustal eclogitization,
- oceanic subduction,
- slab breakoff,
- continental subduction,
- Himalayan-Tibetan collision zone

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References(63)

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Effects of crustal eclogitization on plate subduction/collision dynamics: Implications for India-Asia collision

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