Lithospheric magnetic mapping of the northern Caribbean region

Authors

  • M. CATALÁN Real Instituto y Observatorio de la Armada. San Fernando 1110, Cádiz, Spain. Fax: 956-599366
  • J. MARTÍN-DÁVILA Real Instituto y Observatorio de la Armada. San Fernando 1110, Cádiz, Spain.

DOI:

https://doi.org/10.1344/105.000001872

Keywords:

Caribbean plate, Magnetic anomaly, Poisson's theorem, Potential field

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).

References

Bawiec, W.J., 1999. Geology, Geochemistry, Geophysics, Mineral Occurrences and Mineral Resource Assessment for the Commonwealth of Puerto Rico. U.S. Geological Survey, Open-file Report, 98, 38.

Boynton, C.H., Westbrook, G.K., Bott, M.H.P., Long, R.E., 1979. A seismic refraction investigation of crustal structure beneath the Lesser Antilles Island Arc. Royal Astronomical Society Geophysics Journal, 58, 371-393.

Burke, K., Fox, P.J., Sengör, A.M.C., 1978. Buoyant ocean floor and the evolution of the Caribbean. Journal of Geophysical Research, 83, 3949-3954.

Campbell, D.L., 1983. Basic programs to calculate gravity and magnetic anomalies for 2+1/2 dimensional prismatic bodies. U.S.Geological Survey, Open-file Report 83-154.

Cordell, L., Taylor, P.T., 1971. Investigation of magnetization and density of a North American seamount using Poisson’s theorem. Geophysics, 36(5), 51-62.

Chandler, V.W., Koski, J.S., Hinze W.J., Braille, L.W., 1981. Analysis of multi-source gravity and magnetic anomaly datasets by moving-window application of Poisson theorem. Geophysics, 46(1), 30-39.

Chandler, V.W., Malek, K.C., 1991. Moving-window Poisson analysis of gravity and magnetic data from the Penokean orogen, east central Minnesota. Geophysics, 56(1), 123-132.

Diebold, J.P., Stoffa, P.L., Buhl, P., Truchan, M., 1981.Venezuela Basin crustal structure. Journal of Geophysical Research, 86, 7901-7923.

Donnely, T.W., Melson, W., Kay, R., Rogers, J.J.W., 1973. Basalts and dolerites of Late Cretaceous age from the central Caribbean. In: Edgar, N.T. and others (eds.). Initial Reports of the Deep Sea Drilling Project, Washington, D.C., U.S. Government Printing Office, 15, 989-1011.

Driscoll, N.D., Diebold, J.B., 1998. Deformation of the Caribbean region: One plate or two? Geology, 26, 1043-1046.

ETOPO-2 (World Data Center for Marine Geology and Geophysics: 2-minute gridded global relief data), 2001. National Geophysical Center (NGDC), NOAA Satellite and Information Service. Website: http://www.ngdc.noaa.gov/ mgg/fliers/01mgg04.html .

García-Lobón, J.L., Rey-Moral, C., 2004. Magnetismo y radiación gamma natural de la República Dominicana. Boletín Geológico y Minero, 115(1), 153-168.

Garland, G.D., 1951. Combined analysis of gravity and magnetic anomalies. Geophysics, 16, 51-62.

Gesch, D.B., Verdin, K.L.,Greenlee, S.K., 1999. New land surface digital elevation model covers the earth. Eos, Transactions, American Geophysical Union, 80, 69-70.

Granja Bruña, J.L., Carbó-Gorosabel, A., Muñoz-Martín, A., Llanes Estrada, P., 2008. Gravity maps in the northeastern Caribbean Plate boundary zone. Santo Domingo (Dominican Republic), Transactions of the 18th Caribbean Geological Conference, 27, 48.

Granja Bruña, J.L., Muñoz-Martín, A., ten Brink, U., CarbóGorosabel, A., Llanes Estrada, P., Martín-Dávila, J., Córdoba-Barba, D., Catalán Morollón, M., 2010. Gravity modeling of the Muertos Trough and tectonic implications (north eastern Caribbean). Marine Geophysical Reseraches, 31, 263-283. DOI: 10.1007/s11001-010-9107-8

Kanasewich, E.R., Agarwal, R.G., 1970. Analysis of combined gravity and magnetic fields in wave number domain. Journal of Geophysical Research, 75, 5702-5712.

Macmillan S., Maus, S., 2005, International Geomagnetic Reference Field - The 10th-Generation. Earth Planets Space, 57, 1135-1140.

Mann, P., Burke, K., 1984. Neotectonics of the Caribbean. Reviews of Geophysics and Space Physics, 22(4), 309-362.

Mauffret, A., Leroy, S., 1997. Seismic stratigraphy and structure of the Caribbean Sea. Tectonophysics, 283, 61-104.

Mendonça C.A., 2004. Automatic determination of the magnetization-density ratio and magnetization inclination from the joint interpretation of 2D gravity and magnetic anomalies. Geophysics, 69(4), 938-948.

Metzger, D., Campagnoli, J., 2007. Marine Trackline Geophysics Data on DVD, version 5.0.10, NOAA, National Geophysical Data Center.

Muszala, S.P., Grindlay, N.R., Bird, R.T., 1999. Threedimensional Euler deconvolution and tectonic interpretation of marine magnetic anomaly data in the Puerto Rico trench. Journal Geophysical Research, 104, 29175-29187.

Nelson, J.B., 1994. Leveling total-field aeromagnetic data with measured horizontal gradient. Geophysics, 59, 1166-1170.

Nettleton, L.L., 1976. Gravity and magnetics in oil exploration. New York, McGraw-Hill, 464pp.

Reid, A.B., Allsop, J.M., Granser, H., Millet, A.J., Somerton, I.W., 1990. Magnetic interpretation in three dimensions using Euler deconvolution. Geophysics, 55(1), 80-91.

Ross, H. P., Lavin, P.M., 1966. In-situ determination of the remnant magnetic vector of two dimensional tabular bodies. Geophysics, 31(5), 949-962.

Sabaka, T., Olsen, N., Purucker, M., 2004. Extending comprehensive models of the earth’s magnetic field with Oersted and CHAMP data. Geophysical Journal International, 159, 521-547.

Sandwell, D.T., Smith, W.H.F., 1997. Marine Gravity from Geosat and ERS-1 Altimetry. Journal Geophysical Research, 102, 10039-10054.

Smith, W.H.F., Sandwell, D.T., 1997. Global seafloor topography from satellite altimetry and ship depth soundings. Science, 277, 1956-1962.

Talwani, M., Heirtzler, J.R., 1964. Computation of magnetic anomalies caused by two-dimensional structures of arbitrary shape. In: Parkes, G.A. (ed.). Computers in he mineral industries. Stanford, CA, University Publications, Geological Sciences, 9, 464-480.

Thakur, N.K., Gangadhara Rao, T., Subrahmanyam, C., Khanna, R., 1999. Crossover analysis of geophysical data in Bay of Bengal. Geo-Marine Letters, 19, 262-269.

Thomson, D.T., 1982. EULDPH: A new technique for making computer-assisted depth estimates from magnetic data. Geophysics, 55, 80-91.

Watkins, J., Cavanaugh, T., 1974. Implications of magnetic anomalies in the Venezuelan Basin. Guadaloupe, Transactions of the VII Caribbean Geological Conference, 129-138.

Wessel, P., Watts, A.B., 1988. On the accuracy of marine gravity measurements. Journal Geophysical Research, 93, 393-413.

Wessel, P., Smith, W., 1998. New, improved version of generic mapping tools released. EOS, Transaction American Geophysical Union, 79(47), 579.

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Published

2023-10-26

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