期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 474, 期 -, 页码 59-67出版社
ELSEVIER
DOI: 10.1016/j.epsl.2017.06.017
关键词
continental collision; underplating; slab break-off; numerical modelling; subduction dynamics
资金
- European Research Council [ERC StG 279828]
- Research Council of Norway through its Centres of Excellence funding scheme [223272]
- Natural Environment Research Council [NE/H021620/1]
- French Government Laboratory of Excellence initiative [ANR-10LABX-0006]
- N8 consortium
- EPSRC [EP/K000225/1]
- UNINETT Sigma 2 [Notur NN9283K, NorStore NS9029K]
- Engineering and Physical Sciences Research Council [EP/K000225/1] Funding Source: researchfish
- Natural Environment Research Council [NE/H021620/1] Funding Source: researchfish
- EPSRC [EP/K000225/1] Funding Source: UKRI
- NERC [NE/H021620/1] Funding Source: UKRI
We present three-dimensional numerical models to investigate the dynamics of continental collision, and in particular what happens to the subducted continental lithosphere after oceanic slab. break-off. We find that in some scenarios the subducting continental lithosphere underthrusts the overriding plate not immediately after it enters the trench, but after oceanic slab break-off. In this case, the continental plate first subducts with a steep angle and then, after the slab breaks off at depth, it rises back towards the surface and flattens below the overriding plate, forming a thick horizontal layer of continental crust that extends for about 200 km beyond the suture. This type of behaviour depends on the width of the oceanic plate marginal to the collision zone: wide oceanic margins promote continental underplating and marginal back-arc basins; narrow margins do not show such underplating unless a far field force is applied. Our models show that, as the subducted continental lithosphere rises, the mantle wedge progressively migrates away from the suture and the continental crust heats up, reaching temperatures >900 degrees C. This heating might lead to crustal melting, and resultant magmatism. We observe a sharp peak in the overriding plate rock uplift right after the occurrence of slab break-off. Afterwards, during underplating, the maximum rock uplift is smaller, but the affected area is much wider (up to 350 km). These results can be used to explain the dynamics that led to the present-day crustal configuration of the India Eurasia collision zone and its consequences for the regional tectonic and magmatic evolution. (C) 2017 The Author(s). Published by Elsevier B.V.
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