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Crustal structure of western Hispaniola (Haiti) from a teleseismic receiver function study

Crustal structure of western Hispaniola (Haiti) from a teleseismic receiver function study
Crustal structure of western Hispaniola (Haiti) from a teleseismic receiver function study

Haiti, located at the northern Caribbean plate boundary, records a geological history of terrane accretion from Cretaceous island arc formations to the Eocene to Recent oblique collision with the Bahamas platform. Little is presently known about the underlying crustal structure of the island. We analyze P-waveforms arriving at 27 temporary broadband seismic stations deployed over a distance of 200 km across the major terrane boundaries in Haiti to determine the crustal structure of western Hispaniola. We compute teleseismic receiver functions using the Extended-Time Multi-Taper method and determine crustal thickness and bulk composition (Vp/Vs) using the H-к stacking method. Three distinctive and fault-bounded crustal domains, defined by their characteristic Moho depth distributions and bulk crustal Vp/Vs, are imaged across Haiti. We relate these domains to three crustal terranes that have been accreted along the plate boundary during the northeastwards displacement of the Caribbean plate and are presently being deformed in a localized fold and thrust belt. In the northern domain, made up of volcanic arc facies, the crust has a thickness of ~ 23 km and Vp/Vs of 1.75 ± 0.1 typical of average continental crust. The crust in the southern domain is part of the Caribbean Large Igneous Province (Caribbean LIP), and is ~ 22 km thick with Vp/Vs of 1.80 ± 0.03 consistent with plume-related rocks of late Cretaceous age. Significantly thicker, the crust in central Haiti has values of Moho depths averaging ~ 41 km and with Vp/Vs of 1.80 ± 0.05. We propose that the central domain is likely constructed of an island arc upper crust with fragments of dense material originating from mafic lavas or LIP material. We produce a crustal profile along a N-S transect across Haiti accounting for the surface geology, shallow structural history, and new seismological constraints provided by variations of crustal thickness and bulk composition.

Crustal structure, Haiti, Receivers function
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Corbeau, J.
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Rolandone, F.
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Leroy, S.
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Guerrier, K.
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Keir, D.
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Stuart, G.
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Clouard, V.
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Gallacher, R.
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Ulysse, S.
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Boisson, D.
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Bien-aimé Momplaisir, R.
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Saint Preux, F.
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Prépetit, C.
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Saurel, J. M.
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Mercier de Lépinay, B.
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Meyer, B.
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Corbeau, J.
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Rolandone, F.
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Leroy, S.
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Guerrier, K.
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Keir, D.
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Stuart, G.
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Clouard, V.
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Gallacher, R.
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Ulysse, S.
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Boisson, D.
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Bien-aimé Momplaisir, R.
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Saint Preux, F.
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Prépetit, C.
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Saurel, J. M.
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Mercier de Lépinay, B.
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Meyer, B.
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Corbeau, J., Rolandone, F., Leroy, S., Guerrier, K., Keir, D., Stuart, G., Clouard, V., Gallacher, R., Ulysse, S., Boisson, D., Bien-aimé Momplaisir, R., Saint Preux, F., Prépetit, C., Saurel, J. M., Mercier de Lépinay, B. and Meyer, B. (2017) Crustal structure of western Hispaniola (Haiti) from a teleseismic receiver function study. Tectonophysics, 709, 9-19. (doi:10.1016/j.tecto.2017.04.029).

Record type: Article

Abstract

Haiti, located at the northern Caribbean plate boundary, records a geological history of terrane accretion from Cretaceous island arc formations to the Eocene to Recent oblique collision with the Bahamas platform. Little is presently known about the underlying crustal structure of the island. We analyze P-waveforms arriving at 27 temporary broadband seismic stations deployed over a distance of 200 km across the major terrane boundaries in Haiti to determine the crustal structure of western Hispaniola. We compute teleseismic receiver functions using the Extended-Time Multi-Taper method and determine crustal thickness and bulk composition (Vp/Vs) using the H-к stacking method. Three distinctive and fault-bounded crustal domains, defined by their characteristic Moho depth distributions and bulk crustal Vp/Vs, are imaged across Haiti. We relate these domains to three crustal terranes that have been accreted along the plate boundary during the northeastwards displacement of the Caribbean plate and are presently being deformed in a localized fold and thrust belt. In the northern domain, made up of volcanic arc facies, the crust has a thickness of ~ 23 km and Vp/Vs of 1.75 ± 0.1 typical of average continental crust. The crust in the southern domain is part of the Caribbean Large Igneous Province (Caribbean LIP), and is ~ 22 km thick with Vp/Vs of 1.80 ± 0.03 consistent with plume-related rocks of late Cretaceous age. Significantly thicker, the crust in central Haiti has values of Moho depths averaging ~ 41 km and with Vp/Vs of 1.80 ± 0.05. We propose that the central domain is likely constructed of an island arc upper crust with fragments of dense material originating from mafic lavas or LIP material. We produce a crustal profile along a N-S transect across Haiti accounting for the surface geology, shallow structural history, and new seismological constraints provided by variations of crustal thickness and bulk composition.

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1-s2.0-S0040195117301798-main - Accepted Manuscript
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Accepted/In Press date: 26 April 2017
e-pub ahead of print date: 27 April 2017
Published date: 10 July 2017
Keywords: Crustal structure, Haiti, Receivers function
Organisations: University of Southampton, Ocean and Earth Science, Geology & Geophysics

Identifiers

Local EPrints ID: 411937
URI: http://eprints.soton.ac.uk/id/eprint/411937
ISSN: 0040-1951
PURE UUID: 93dca835-c389-41fa-a50b-040b7e040111
ORCID for D. Keir: ORCID iD orcid.org/0000-0001-8787-8446

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Date deposited: 30 Jun 2017 16:30
Last modified: 07 Oct 2020 06:40

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Contributors

Author: J. Corbeau
Author: F. Rolandone
Author: S. Leroy
Author: K. Guerrier
Author: D. Keir ORCID iD
Author: G. Stuart
Author: V. Clouard
Author: R. Gallacher
Author: S. Ulysse
Author: D. Boisson
Author: R. Bien-aimé Momplaisir
Author: F. Saint Preux
Author: C. Prépetit
Author: J. M. Saurel
Author: B. Mercier de Lépinay
Author: B. Meyer

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