Chang, Sung-Joon;
Ferreira, Ana M. G.;
Faccenda, Manuele;
(2016)
Upper- and mid-mantle interaction between the Samoan plume and the Tonga–Kermadec slabs.
Nature Communications
, 7
, Article 10799. 10.1038/ncomms10799.
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Abstract
Mantle plumes are thought to play a key role in transferring heat from the core–mantle boundary to the lithosphere, where it can significantly influence plate tectonics. On impinging on the lithosphere at spreading ridges or in intra-plate settings, mantle plumes may generate hotspots, large igneous provinces and hence considerable dynamic topography. However, the active role of mantle plumes on subducting slabs remains poorly understood. Here we show that the stagnation at 660 km and fastest trench retreat of the Tonga slab in Southwestern Pacific are consistent with an interaction with the Samoan plume and the Hikurangi plateau. Our findings are based on comparisons between 3D anisotropic tomography images and 3D petrological-thermo-mechanical models, which self-consistently explain several unique features of the Fiji–Tonga region. We identify four possible slip systems of bridgmanite in the lower mantle that reconcile the observed seismic anisotropy beneath the Tonga slab (VSH>VSV) with thermo-mechanical calculations.
Type: | Article |
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Title: | Upper- and mid-mantle interaction between the Samoan plume and the Tonga–Kermadec slabs |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1038/ncomms10799 |
Publisher version: | http://dx.doi.org/10.1038/ncomms10799 |
Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/1478170 |
1. | China | 7 |
2. | United States | 5 |
3. | Russian Federation | 2 |
4. | Greece | 1 |
5. | South Africa | 1 |
6. | Germany | 1 |
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