Complutense University Library

Paleomagnetic determinations on Lanzarote from magnetic and gravity anomalies: Implications for the early history of the Canary Islands

Blanco-Montenegro, I. and González Montesinos, Fuensanta and Garcia, Alicia and Vieira, Ricardo and Villalain, J.J. (2005) Paleomagnetic determinations on Lanzarote from magnetic and gravity anomalies: Implications for the early history of the Canary Islands. Journal of Geophysical Research-Solid Earth, 110 (B12). ISSN 0148-0227

[img] PDF
Restricted to Repository staff only until 2020.

378kB

Official URL: http://www.agu.org/journals/jb/jb0512/2005JB003668/2005JB003668.pdf

View download statistics for this eprint

==>>> Export to other formats

Abstract

The Bouguer and aeromagnetic anomaly maps of Lanzarote show a gravity high and a dipolar magnetic anomaly over the central part of the island, indicating one isolated source. Assuming that the structure responsible for both anomalies is the same, a methodology has been designed to estimate the total magnetization vector of the source, which is interpreted as a large intrusive body (mafic core) positioned as a result of magma rising to the surface during the early stages of growth of Lanzarote. Considering its geometry to be known from a previous three-dimensional (3-D) gravity model, the approach proposed in this paper is based on the delineation of magnetic contacts through analysis of the horizontal gradient of the reduced-to-the-pole anomaly map, comparison between the gravity and the pseudogravity anomalies, and 3-D forward magnetic modeling. The total magnetization vector obtained by this method is defined by a module of 4.5 A m(-1) and a direction D = -20 degrees and I = 30 degrees. Comparing the paleomagnetic pole, obtained from this direction, with the apparent polar wander path of Africa for the last 160 Myr, it is concluded that the main component of the total magnetization vector is probably a primary natural remanent magnetization (NRM) which could have been acquired between 60 and 100 Ma. This result suggests that the emplacement of magmas at shallow depths linked to the beginning of volcanism in Lanzarote took place during the Upper Cretaceous, thus providing the first evidence of a timeline for the early formative stages of this volcanic island.

Item Type:Article
Uncontrolled Keywords: Geomagnetic Polarity History; Potassium-Argon Ages; La-Palma; Gran-Canaria; Volcanic Stratigraphy; Central Atlantic; Oceanic Island; Fuerteventura; Evolution; Tenerife
Subjects:Sciences > Geology > Seismology
ID Code:15905
References:

Abdel-Monem, A., N. D. Watkins, and P. W. Gast (1971), Potassium-Argon ages, volcanic stratigraphy and geomagnetic polarity history of the Canary Islands: Lanzarote, Fuerteventura, Gran Canaria and La Gomera, Am. J. Sci., 271, 490–521.

Abdel-Monem, A., N. D. Watkins, and P. W. Gast (1972), Potassium-Argon ages, volcanic stratigraphy and geomagnetic polarity history of the Canary Islands: Tenerife, La Palma and Hierro, Am. J. Sci., 272, 805– 825.

Ancochea, E., J. M. Fu´ster, E. Ibarrola, A. Cendrero, J. Coello, F. Hernán, J. M. Cantagrel, and C. Jamond (1990), Volcanic evolution of the island of Tenerife (Canary Islands) in light of new K-Ar data, J. Volcanol Geotherm. Res., 44, 231– 249.

Ancochea, E., F. Hernán, A. Cendrero, J. M. Cantagrel, J. M. Fúster, E. Ibarrola, and J. Coello (1993), Constructive and destructive episodes in the building of a young oceanic island, La Palma, Canary Islands and genesis of the Caldera de Taburiente, J. Volcanol. Geotherm. Res., 60, 243– 262.

Anguita, F., and F. Herna´n (2000), The Canary Islands origin: A unifying model, J. Volcanol. Geotherm. Res., 103, 1– 26.

Araña, V., A. G. Camacho, A. García, F. G.Montesinos, I. Blanco, R. Vieira, and A. Felpeto (2000), Internal structure of Tenerife (Canary Islands) based on gravity, aeromagnetic and volcanological data, J. Volcanol. Geotherm. Res., 103, 43–64.

Balogh, K., A. Ahijado, R. Casillas, and C. Ferna´ndez (1999), Contributions to the chronology of the Basal Complex of Fuerteventura, Canary Islands, J. Volcanol. Geotherm. Res., 90, 81–101.

Banda, E., J. J. Dan˜obeitia, E. Surin˜ach, and J. Ansorge (1981), Features of crustal structure under the Canary Islands, Earth Planet. Sci. Lett., 55, 11– 24.

Besse, J., and V. Courtillot (2002), Apparent and true polar wander and the geometry of the geomagnetic field over the last 200 Myr, J. Geophys. Res., 107(B11), 2300, doi:10.1029/2000JB000050.

Bhattacharyya, B. K. (1964), Magnetic anomalies due to prism-shaped bodies with arbitrary polarization, Geophysics, 29, 517– 531.

Blakely, R. J. (1995), Potential Theory in Gravity and Magnetic Applications, 441 pp., Cambridge Univ. Press, New York.

Blakely, R. J., and R. W. Simpson (1986), Approximating edges of source bodies from magnetic or gravity anomalies, Geophysics, 51, 1494–1498.

Blanco-Montenegro, I., J. M. Torta, A. Garcı´a, and V. Araña (2003), Analysis and modeling of the aeromagnetic anomalies of Gran Canaria (Canary Islands), Earth Planet. Sci. Lett., 206, 601– 616.

Camacho, A. G., F. G. Montesinos, R. Vieira, and J. Arnoso (2001), Modeling of crustal anomalies of Lanzarote (Canary Islands) in light of gravity data, Geophys. J. Int., 147, 403– 414.

Coello, J., J.M. Cantagrel, F. Herna´n, J.M. Fu´ster, E. Ibarrola, E. Ancochea, C. Casquet, C. Jamond, J. R. Díaz de Terán, and A. Cendrero (1992), Evolution of the eastern volcanic ridge of the Canary Islands based on new K-Ar data, J. Volcanol. Geotherm. Res., 53, 251–274.

Cordell, L., and V. J. S. Grauch (1985), Mapping basement magnetization zones from aeromagnetic data in the San Juan basin, New Mexico, in The Utility of Regional Gravity and Magnetic Anomaly Maps, edited by W. J. Hinze, pp. 181– 197, Soc. of Explor. Geophys., Tulsa, Okla.

Fúster, J. M., S. Fernández Santín, and J. Sagredo (1968), Geology and volcanology of the Canary Islands, Lanzarote, Inst. Lucas Mallada, Cons. Super. de Invest. Cient., Madrid.

Gee, J., H. Staudigel, L. Tauxe, T. Pick, and Y. Gallet (1993), Magnetization of the La Palma Seamount Series: Implications for seamount paleopoles, J. Geophys. Res., 98, 1743– 1767.

Gorbatikov, A. V., A. V. Kalinina, V. A. Volkov, J. Arnoso, R. Vieira, and E. Velez (2004), Results of analysis of the data of microseismic survey at Lanzarote Island, Canary, Spain, Pure Appl. Geophys., 161, 1561–1578.

Gradstein, F. M., F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. van Veen, J. Thierry, and Z. Huang (1994), A Mesozoic time scale, J. Geophys. Res., 99, 24,051–24,074.

Grunau, H. R., P. Lehner, M. R. Cleintuar, P. Allebanch, and G. Bakker (1975), New radiometric ages and seismic data from Fuerteventura (Canary Islands), Maio (Cape Verde Islands) and Sao Tomé (Gulf of Guinea),in Progress in Geodynamics, edited by G. J. Borradaile et al., pp. 90–

118, R. Soc. Neth. Acad. Arts Sci., Amsterdam.

Guillou, H., J. C. Carracedo, F. Pe´rez-Torrado, and E. Rodríguez-Badiola(1996), K-Ar ages and magnetic stratigraphy of a hotspot induced, fast grown oceanic island: El Hierro, Canary Islands, J. Volcanol. Geotherm. Res., 73, 141–155.

Hildenbrand, T. G., J. G. Rosenbaum, and J. P. Kauahikaua (1993), Aeromagnetic study of the island of Hawaii, J. Geophys. Res., 98, 4099– 4119.

Hoernle, K., Y. S. Yang, and D. Graham (1995), Seismic and geochemical evidence for large-scale mantle upwelling beneath the eastern Atlantic and western and central Europe, Nature, 374, 34– 39.

Hunt, C. P., B. M. Moskowitz, and S. K. Banerjee (1995), Magnetic properties of rocks and minerals, in A Handbook of Physical Constants: Rock Physics and Phase Relations, Ref. Shelf, vol. 3, edited by T. J. Ahrens, pp. 189–204, AGU, Washington, D. C. IAGA Division V, Working Group 8 (1996), International Geomagnetic Reference Field, 1995 revision, Geophys. J. Int., 125, 318– 321.

Ibarrola, E., J. M. Cantagrel, J. M. Fu´ster, J. Coello, and C. Jamond (1989), Edades K-Ar de las rocas volca´nicas submarinas en el sector norte del complejo basal de Fuerteventura, paper presented at Meeting on Canarian Volcanism, Eur. Sci. Found., Tenerife, Spain. Le Bas, M. J., D. C. Rex, and C. J. Stillman (1986), The early magmatic

chronology of Fuerteventura, Canary Islands, Geol. Mag., 123, 287–298.

Le´nat, J.-F., B. Gibert-Malengreau, and A. Galdeano (2001), A new structural model for the evolution of the volcanic island of Re´union (Indian Ocean), J. Geophys. Res., 106, 8645–8663.

Marinoni, L. B., and G. Pasquare` (1994), Tectonic evolution of the emergent part of a volcanic island: Lanzarote, Canary Islands, Tectonophysics, 239, 111– 135.

Martı´nez del Olmo, W., and J. Buitrago (2002), Sedimentary and volcanic record east of Lanzarote and Fuerteventura Islands (Fuster Casas trough), Geogaceta, 32, 51– 54.

McDougall, I., and H.-U. Schmincke (1976), Geochronology of Gran Canaria, Canary Islands: Age of shield building volcanism and other magmatic phases, Bull. Volcanol., 40, 57–77.

Montelli, R., G. Nolet, F. Dahlen, G. Masters, E. R. Engdahl, and S. H. Hung (2004), Finite-frequency tomography reveals a variety of plumes in the mantle, Science, 303, 338– 343.

Neumann, E.-R., V. B. Sorensen, S. L. Simonsen, and K. Johnsen (2000), Gabbroic xenoliths from La Palma, Tenerife and Lanzarote, Canary Islands: Evidence for reactions between mafic alkaline Canary Islands melts and old oceanic crust, J. Volcanol. Geotherm. Res., 103, 313– 342.

Oyarzun, R., M. Doblas, J. Lo´pez-Ruiz, and J. M. Cebria´ (1997), Opening of the central Atlantic and asymmetric mantle upwelling phenomena: Implications for long-lived magmatism in western North Africa and Europe, Geology, 25, 727– 730.

Parker, R. L. (1991), A theory of ideal bodies for seamount magnetism, J. Geophys. Res., 96, 16,101–16,112.

Roest, W. R., J. J. Dan˜obeitia, J. Verhoef, and B. J. Collette (1992), Magnetic anomalies in the Canary Basin and the Mesozoic evolution of the central North Atlantic, Mar. Geophys. Res., 14, 1 –24.

Sánchez-Guzmán, J., and J. Abad (1986), Sondeo geotérmico Lanzarote-1. Significado geológico y geotérmico, in Física de los fenómenos volcánicos, edited by V. Aran˜a and R. Ortiz, Anal. Fís., 82, 102– 109.

Schmincke, H.-U., A. Klu¨gel, T. H. Hansteen, K. Hoernle, and P. van den Bogaard (1998), Samples from the Jurassic ocean crust beneath Gran Canaria, La Palma and Lanzarote (Canary Islands), Earth Planet. Sci. Lett., 163, 343–360.

Socías, I., and J. Mézcua(1996),Levantamientoaeromagnético del archipiélago canario, Publ. Te´c. 35, 28 pp., Inst. Geogr. Nac., Madrid,Spain.

Steiner, C., A. Hobson, P. Faure, G. M. Stampfi, and J. Hernández (1998), Mesozoic sequence of Fuerteventura (Canary Islands): Witness of early Jurassic sea-floor spreading in the central Atlantic, Geol. Soc. Am. Bull.,

110, 1304– 1317.

Storetvedt, K. M. (1980), Fuerteventura palaeomagnetism and the evolution of the continental margin off Morocco, Phys. Earth Planet. Inter., 21, 81– 86.

Storetvedt, K. M., H. M. Vage, S. Aase, and R. Lovlie (1979), Palaeomagnetism and the early magmatic history of Fuerteventura (Canary Islands), J. Geophys., 46, 319– 334.

Worm, H. U. (2001), Magnetic stability of oceanic gabbros from ODP Hole 735B, Earth Planet. Sci. Lett., 193, 287– 302.

Deposited On:11 Jul 2012 10:46
Last Modified:06 Feb 2014 10:34

Repository Staff Only: item control page