Subduction history of the Caribbean from upper-mantle seismic imaging and plate reconstruction.

Autor: Braszus B; Geophysical Institute (GPI), Karlsruhe Institute of Technology, Karlsruhe, Germany. benedikt.braszus@kit.edu., Goes S; Department of Earth Science and Engineering, Imperial College London, London, UK. s.goes@imperial.ac.uk., Allen R; Department of Earth Science and Engineering, Imperial College London, London, UK., Rietbrock A; Geophysical Institute (GPI), Karlsruhe Institute of Technology, Karlsruhe, Germany., Collier J; Department of Earth Science and Engineering, Imperial College London, London, UK., Harmon N; National Oceanography Centre, University of Southampton, Southampton, UK., Henstock T; National Oceanography Centre, University of Southampton, Southampton, UK., Hicks S; Department of Earth Science and Engineering, Imperial College London, London, UK., Rychert CA; National Oceanography Centre, University of Southampton, Southampton, UK., Maunder B; Department of Earth Science and Engineering, Imperial College London, London, UK., van Hunen J; Department of Earth Sciences, Durham University, Durham, UK., Bie L; Geophysical Institute (GPI), Karlsruhe Institute of Technology, Karlsruhe, Germany., Blundy J; School of Earth Sciences, University of Bristol, Bristol, UK., Cooper G; School of Earth Sciences, University of Bristol, Bristol, UK., Davy R; Department of Earth Science and Engineering, Imperial College London, London, UK., Kendall JM; Department of Earth Sciences, University of Oxford, Oxford, UK., Macpherson C; Department of Earth Sciences, Durham University, Durham, UK., Wilkinson J; Department of Earth Science and Engineering, Imperial College London, London, UK.; Natural History Museum, London, UK., Wilson M; School of Earth and Environment, University of Leeds, Leeds, UK.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2021 Jul 09; Vol. 12 (1), pp. 4211. Date of Electronic Publication: 2021 Jul 09.
DOI: 10.1038/s41467-021-24413-0
Abstrakt: The margins of the Caribbean and associated hazards and resources have been shaped by a poorly understood history of subduction. Using new data, we improve teleseismic P-wave imaging of the eastern Caribbean upper mantle and compare identified subducted-plate fragments with trench locations predicted from plate reconstruction. This shows that material at 700-1200 km depth below South America derives from 90-115 Myr old westward subduction, initiated prior to Caribbean Large-Igneous-Province volcanism. At shallower depths, an accumulation of subducted material is attributed to Great Arc of the Caribbean subduction as it evolved over the past 70 Ma. We interpret gaps in these subducted-plate anomalies as: a plate window and tear along the subducted Proto-Caribbean ridge; tearing along subducted fracture zones, and subduction of a volatile-rich boundary between Proto-Caribbean and Atlantic domains. Phases of back-arc spreading and arc jumps correlate with changes in age, and hence buoyancy, of the subducting plate.
(© 2021. The Author(s).)
Databáze: MEDLINE
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