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

Subduction history of the Caribbean from upper-mantle seismic imaging and plate reconstruction
Subduction history of the Caribbean from upper-mantle seismic imaging and plate reconstruction
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.
2041-1723
Braszus, Benedikt
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Goes, Saskia
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Allen, Rob
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Rietbrock, Andreas
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Collier, Jenny
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Harmon, Nicholas
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Henstock, Tim
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Hicks, Stephen
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Rychert, Catherine A.
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Maunder, Ben
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van Hunen, Jeroen
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Bie, Lidong
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Blundy, Jon
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Cooper, George
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Davy, Richard
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Kendall, J. Michael
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Macpherson, Colin
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Wilkinson, Jamie
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Wilson, Marjorie
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Braszus, Benedikt
f3e43371-7d9d-4001-9873-6e4a48c33148
Goes, Saskia
8da1004a-3f5b-44c9-9889-046c5b6c537e
Allen, Rob
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Rietbrock, Andreas
e4656f22-06be-40fe-8f98-7f88c351c434
Collier, Jenny
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Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Henstock, Tim
2ba07a14-ad57-4108-8690-28ca3ad8cce2
Hicks, Stephen
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Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Maunder, Ben
84d57aff-ca13-49c8-b163-26b97cdcb5d6
van Hunen, Jeroen
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Bie, Lidong
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Blundy, Jon
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Cooper, George
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Davy, Richard
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Kendall, J. Michael
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Macpherson, Colin
0238c038-c934-42dd-8ed4-5109a8a63e57
Wilkinson, Jamie
67495df9-98a6-4231-baaf-88859552d2ca
Wilson, Marjorie
12d1e97a-5f12-4c88-b2d8-03f23bd756e2

Braszus, Benedikt, Goes, Saskia, Allen, Rob, Rietbrock, Andreas, Collier, Jenny, Harmon, Nicholas, Henstock, Tim, Hicks, Stephen, Rychert, Catherine A., Maunder, Ben, van Hunen, Jeroen, Bie, Lidong, Blundy, Jon, Cooper, George, Davy, Richard, Kendall, J. Michael, Macpherson, Colin, Wilkinson, Jamie and Wilson, Marjorie (2021) Subduction history of the Caribbean from upper-mantle seismic imaging and plate reconstruction. Nature Communications, 12 (1), [4211]. (doi:10.1038/s41467-021-24413-0).

Record type: Article

Abstract

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.

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Published date: 9 July 2021

Identifiers

Local EPrints ID: 450332
URI: http://eprints.soton.ac.uk/id/eprint/450332
ISSN: 2041-1723
PURE UUID: 35acb4f4-b8b9-4d7c-882d-429034655e68
ORCID for Nicholas Harmon: ORCID iD orcid.org/0000-0002-0731-768X
ORCID for Stephen Hicks: ORCID iD orcid.org/0000-0002-7476-3284

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Date deposited: 23 Jul 2021 16:30
Last modified: 30 Jul 2021 01:40

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