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Crustal and upper mantle structure beneath the Gulf of Mexico and the Caribbean Sea from Rayleigh-wave analysis

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doi: 10.1002/gj.2999
Authors:Corchete, Victor
Author Affiliations:Primary:
University of Almeria, Higher Polytechnic School, Almeria, Spain
Volume Title:Geological Journal
Source:Geological Journal, 53(5), p.1743-1754. Publisher: Wiley, Chichester, United Kingdom. ISSN: 0072-1050
Publication Date:2018
Note:In English. 45 refs.; illus., incl. geol. sketch maps
Summary:The elastic structure beneath the Gulf of Mexico and the Caribbean Sea is presented in this paper by means of S-velocity maps, for depths ranging from 0 to 350 km, determined from Rayleigh-wave analysis. The S-velocity mapping, for the depth range from 0 to 5 km, shows clearly the distribution of sedimentary basins of the study area. For the depth range from 5 to 35 km, the higher S-velocity values are associated to the areas in which the crust is thinner (oceanic crust). For the Caribbean Plate, which consists of the Venezuelan and Colombian basins separated by the Beata Ridge, a differentiation between both basins is possible in terms of S-velocity. The thickening of the Caribbean crust (observed in the southern part of the study area), due to the Caribbean-South America plate interactions, is confirmed by the S-velocity mapping; thickened crust is characterized by S-velocities lower than those for the upper mantle. For depths greater than 35 km, the S-velocity presents its higher values at the older regions of the study area, while the younger or active regions are imaged with low S-velocity. Finally, a new and very interesting feature presented in this study is the location and thickness of the lithosphere-asthenosphere system. On the other hand, this study provides the mapping necessary to locate the deep geologic structures, present in the study area, which tectonic and geologic evolution is wished to determine, allowing also to know the nature and type of the crust and upper-mantle structure beneath this area. Once this knowledge is reached, an evolutionary model can be developed. This study is especially interesting for areas in the Gulf of Mexico that are hidden beneath near-opaque, complex, and extensive allochthonous salt bodies, which make it difficult to use other seismic exploration techniques such as seismic refraction or reflection techniques. Abstract Copyright (2018), John Wiley & Sons, Ltd.
Subjects:Analysis; Asthenosphere; Basins; Body waves; Crust; Elastic waves; Guided waves; Lithosphere; Mantle; Numerical analysis; Rayleigh waves; S-waves; Seismic waves; Seismicity; Surface waves; Upper mantle; Atlantic Ocean; Caribbean Sea; Gulf of Mexico; North Atlantic
Coordinates:N200000 N300000 W0800000 W0950000
Record ID:841473-8
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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100 1 |a Corchete, Victor  |e analytic author  |u University of Almeria, Higher Polytechnic School, Almeria 
245 1 0 |a Crustal and upper mantle structure beneath the Gulf of Mexico and the Caribbean Sea from Rayleigh-wave analysis 
300 |a p. 1743-1754 
500 |a In English. 45 refs. 
500 |a Affiliation: University of Almeria, Higher Polytechnic School; Almeria; ESP; Spain 
500 |a Key title: Geological Journal 
500 |a Source note: Geological Journal, 53(5), p.1743-1754. Publisher: Wiley, Chichester, United Kingdom. ISSN: 0072-1050 
500 |a Publication type: journal article 
504 |b 45 refs. 
510 3 |a GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom 
520 |a The elastic structure beneath the Gulf of Mexico and the Caribbean Sea is presented in this paper by means of S-velocity maps, for depths ranging from 0 to 350 km, determined from Rayleigh-wave analysis. The S-velocity mapping, for the depth range from 0 to 5 km, shows clearly the distribution of sedimentary basins of the study area. For the depth range from 5 to 35 km, the higher S-velocity values are associated to the areas in which the crust is thinner (oceanic crust). For the Caribbean Plate, which consists of the Venezuelan and Colombian basins separated by the Beata Ridge, a differentiation between both basins is possible in terms of S-velocity. The thickening of the Caribbean crust (observed in the southern part of the study area), due to the Caribbean-South America plate interactions, is confirmed by the S-velocity mapping; thickened crust is characterized by S-velocities lower than those for the upper mantle. For depths greater than 35 km, the S-velocity presents its higher values at the older regions of the study area, while the younger or active regions are imaged with low S-velocity. Finally, a new and very interesting feature presented in this study is the location and thickness of the lithosphere-asthenosphere system. On the other hand, this study provides the mapping necessary to locate the deep geologic structures, present in the study area, which tectonic and geologic evolution is wished to determine, allowing also to know the nature and type of the crust and upper-mantle structure beneath this area. Once this knowledge is reached, an evolutionary model can be developed. This study is especially interesting for areas in the Gulf of Mexico that are hidden beneath near-opaque, complex, and extensive allochthonous salt bodies, which make it difficult to use other seismic exploration techniques such as seismic refraction or reflection techniques. Abstract Copyright (2018), John Wiley & Sons, Ltd. 
650 7 |a Analysis  |2 georeft 
650 7 |a Asthenosphere  |2 georeft 
650 7 |a Basins  |2 georeft 
650 7 |a Body waves  |2 georeft 
650 7 |a Crust  |2 georeft 
650 7 |a Elastic waves  |2 georeft 
650 7 |a Guided waves  |2 georeft 
650 7 |a Lithosphere  |2 georeft 
650 7 |a Mantle  |2 georeft 
650 7 |a Numerical analysis  |2 georeft 
650 7 |a Rayleigh waves  |2 georeft 
650 7 |a S-waves  |2 georeft 
650 7 |a Seismic waves  |2 georeft 
650 7 |a Seismicity  |2 georeft 
650 7 |a Surface waves  |2 georeft 
650 7 |a Upper mantle  |2 georeft 
651 7 |a Atlantic Ocean  |2 georeft 
651 7 |a Caribbean Sea  |2 georeft 
651 7 |a Gulf of Mexico  |2 georeft 
651 7 |a North Atlantic  |2 georeft 
773 0 |t Geological Journal  |d Chichester : Wiley, Sep. 2018  |x 0072-1050  |y GELJA8  |n Geological Journal, 53(5), p.1743-1754. Publisher: Wiley, Chichester, United Kingdom. ISSN: 0072-1050 Publication type: journal article  |g Vol. 53, no. 5  |h illus., incl. geol. sketch maps 
856 |u urn:doi: 10.1002/gj.2999