Lithospheric magnetic mapping of the northern Caribbean region
Manuel Catalán,J. Martín-Dávila +1 more
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A more complete view of the northernmost part of the Venezuela Basin is provided by data from an international public database processed with new geomagnetic models (CM4) together with data from aeromagnetic surveys and from a recent marine cruise in areas offshore Puerto Rico and the Dominican Republic as mentioned in this paper.Abstract:
A more complete crustal perspective of the northernmost part of the Venezuela Basin is provided by data from an international public database processed with new geomagnetic models (CM4) together with data from aeromagnetic surveys and from a recent marine cruise in areas offshore Puerto Rico and the Dominican Republic. The magnetic anomaly map set off three main domains: the North Atlantic plate, a narrow zone extending from the Dominican Republic to Puerto Rico-Virgin Islands, and the North Caribbean Plate. We focused mainly on the latter, applying the Euler deconvolution algorithm in the Venezuela Basin. Shallow and middle depth sources (located between 2km and 12km) are inferred to be the dominant sources (85%), while deep sources are located mostly in the Venezuela Basin, and scarcely appear in the Beata and Aves Ridges. We performed 2D+1/2 modeling on an eastwest transect, using Bouguer gravity and magnetic anomaly data to derive a more detailed crustal description of the northern part of the Venezuela Basin. The model suggests that in the Caribbean crust, long wavelengths (>200km) are controlled by variations in crustal thickness, whereas the intermediate ones (50-100km) are mainly controlled by variations in their magnetic properties. It also suggests the presence of a local anomalous body located in the east-west transect, between 487km and 560km, displaying a remarkable positive magnetization contrast (0.3 SI) with regard to the rest of the basin. This body shows a slight increase in density (3010kg/m3), and extends from the bottom of the UCL (Underplate Cumulate Layer) to a depth of 7.5km. We correlate it with the volcanic wedge reported by Driscoll and Diebold (1998).read more
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Modeling the Crust and Upper Mantle in Northern Beata Ridge (CARIBE NORTE Project)
TL;DR: In this paper, wide-angle seismic data are analyzed along a WNW-ESE trending line in the northern flank of Beata Ridge, providing a complete tectonic view about shallow, middle and deep structures.
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A New Method for the Collection of Marine Geomagnetic Information: Survey Application in the Colombian Caribbean
Karem Oviedo Prada,Bismarck Jigena Antelo,Nathalia Otálora Murillo,Jeanette Romero Cózar,Francisco Contreras-de-Villar,Juan J. Muñoz-Perez +5 more
TL;DR: In this paper, a grid of geomagnetic data was surveyed in an area close to the Island of San Andres in the north-west of the Colombian maritime territory, and the results showed negligible differences between the magnetic data obtained for the years 1970 and 2018 for all the variables measured, such as the inclination, declination, and total magnetic field.
References
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Analysis of combined gravity and magnetic fields in wave number domain
E. R. Kanasewich,R. G. Agarwal +1 more
TL;DR: In this article, a two-dimensional fast Fourier transform is used to obtain convolution, upward continuation, vertical and horizontal derivatives, and reduction of the total field to the pole.
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Geology, geochemistry, geophysics, mineral occurrences, and mineral resource assessment for the commonwealth of Puerto Rico
TL;DR: In this article, the authors present a geologic map with faults, along with additional scientific information needed for mineral resource assessment (geochemical analyses, mineral occurrences, geologic terranes, and estimated undiscovered resources).
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Marine gravity from Geosat and ERS-1 altimetry in the Weddell Sea
David C. McAdoo,Seymour W. Laxon +1 more
TL;DR: In this paper, a high-resolution gravity field covering virtually all of the Weddell Sea has been derived using a combination of Geosat and ERS-1 data.