Artículo

Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

A magnetotelluric (MT) profile and conventional seismic reflection lines are used to characterize the sedimentary basin across the Andean foothills in the Tucumán Plain. This basin is a depocenter surrounded by crystalline basement and filled with a several-kilometer-thick sedimentary sequence. Because of the high contrast in electrical resistivity between the basin sedimentary rocks and the crystalline basement, this interface dominates the MT response and masks details of the structure within the sedimentary units. This paper presents a new interpretation of the MT data incorporating structure constraints obtained from a network of seismic lines. Our results indicate that a significantly improved characterization of the conductive horizons within the basin is obtained when resistivity model discontinuities are introduced at the seismic reflectors corresponding to the most important formation boundaries. Improved resistivities of the main formations, Cretaceous-Miocene and Miocene-Pliocene, were inferred. The comparison of constrained and unconstrained models constitutes an instructive case study of how controlled MT inversion can improve structure imaging. It also shows that the application of constraints in the inversion process is a worthy option to find a geologically supported model, especially if data misfit shows a marked nonrandom distribution. Copyright 2007 by the American Geophysical Union.

Registro:

Documento: Artículo
Título:Magnetotelluric inversion constrained by seismic data in the Tucumán Basin (Andean Foothills, 27°S, NW Argentina)
Autor:Favetto, A.; Pomposiello, C.; Booker, J.; Rossello, E.A.
Filiación:Instituto de Geocronología y Geología Isotópica, Consejo Nacional de Investigaciones Científicas y Técnicas, Pabellón, 1428 Buenos Aires, Argentina
Department of Earth and Space Science, University of Washington, Box 351310, Seattle, WA 98195, United States
Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, 1428 Buenos Aires, Argentina
Palabras clave:basement rock; data inversion; depocenter; electrical resistivity; magnetotelluric method; modeling; sedimentary basin; sedimentary rock; seismic data; seismic reflection; Argentina; South America; Tucuman
Año:2007
Volumen:112
Número:9
DOI: http://dx.doi.org/10.1029/2006JB004455
Título revista:Journal of Geophysical Research: Solid Earth
Título revista abreviado:J. Geophys. Res. B Solid Earth
ISSN:21699313
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v112_n9_p_Favetto

Referencias:

  • Baldis, B., Demichelli, J., Febrer, J., Fournier, H., Garcia, E., Gasco, J.C., Mamani, M., Pomposiello, M.C., Magnetotelluric results along a 1200-km-long profile showing at its northwest end an important geothermal area in the provinces of Tucumán and Santiago del Estero in Argentina (1983) J. Geomagn. Geoelectr, 35, pp. 609-621
  • Battaglia, A. C. (1982), Descripción geológica de las Hojas 13f, Río Hondo, 13g, Santiago del Estero, 14g, El Alto, 14h, Villa San Martín, 15g, Frías. Provincias de Santiago del Estero, Catamarca y Tucmán, Bol. 186, 80 pp., Serv. Geol. Nac., Buenos Aires, Argentina; Bossi, G.E., Geologia y Estratigrafia del Sector sur del valle de Choromoro (1969) Acta Geol. Lilloana, 10, pp. 17-64
  • Bibby, H.M., Caldwell, T.G., Brown, C., Determinable and non-determinable parameters of galvanic distortion in magnetotellurics (2005) Geophys. J. Int, 163 (3), pp. 915-930
  • Cristallini, E., Comínguez, A., Ramos, V.A., La estructura profunda del Aconquija y regiones adyacentes, Tucumin y Santiago del Estero, Argentina (1997) 8th Congreso Geológico Chileno, , paper presented at, Antofagasta, Univ. Católica del Norte, Antofagasta, Chile
  • Cristallini, E., A. Comínguez, V. A. Ramos, and E. D. Mercerat (2004), Basement double-wedge thrusting in western Sierras Pampeanas of Argentina (27°SL): Constraints from deep seismic reflection, in Trust Tectonics, edited by K. McClay, AAPG Mem., 82, 65-90; Egbert, G., Booker, J., Robust estimation of geomagnetic transfer function estimation (1991) Geophys. J. R. Astron. Soc, 87, pp. 173-194
  • Favetto, A., Pomposiello, M.C., Benedit, T., Booker, J., Magnetotelluric model of the chacoparanense sedimentary basin at 31.5°S Argentina (2005) paper presented at the 17th Workshop, Natl. Geophys. Res. Inst, , http:// www.emindia2004.org, Hyderabad, India, 18-23 Oct, Available at
  • James, D.E., Sacks, S., Cenozoic formation of the central Andes: A geophysical perspective (1999) Geology of Ore Deposits of the Central Andes, pp. 1-25. , edited by B. J. Skinner, Spec. Publ. 7, pp, Soc. of Econ. Geol, Littleton, Colo
  • Jordan, T., Allmendinger, R., Sierras Pampeanas of Argentina: A modern analogue of Rocky Mountain foreland deformation (1986) Am. J. Sci, 286, pp. 737-764
  • Kley, J., Rossello, E.A., Monaldi, C.R., Habighorst, B., Seismic and field evidence of Cretaceous normal faults, Salta rift, Northwest Argentina (2002) paper presented at 5th International Symposium on Andean Geodynamics, , Univ. P. Sabatier, Toulouse, France
  • McNeice, G., Jones, A., Multi-site, multi-frequency tensor decomposition of magnetotelluric data (2001) Geophysics, 66, pp. 158-173
  • Pacheco, M., Mansilla, N., Mon, R., Sosa Gómez, J., Piccioni, L., The Tucumán Basin as a part of Cretaceous continental rift of South America (2000) Profil Geowis. Lateinam. Kollok, 18, pp. 1-5
  • Pacheco, M., Mansilla, N., Mon, R., Seismic stratigraphy and tectonics of the Tucumń Basin (Cretaceous Continental Rift of South America) (2002) paper presented at 5th International Symposium on Andean Geodynamics, , Univ. P. Sabatier, Toulouse, France
  • Parker, R., Booker, J., Optimal one-dimensional inversion and bounding of magnetotelluric apparent resistivity and phase measurements (1996) Phys. Earth Planet. Inter, 98, pp. 269-282
  • Pomposiello, M.C., Mon, R., Díaz, M.T., The gravity field of Tucumán Plain and its implications in structural geology (1991) Geodynamique, 6 (1), pp. 3-8
  • Pomposiello, M.C., Osella, A., Maidana, A., Borzotta, E., MT Studies in the S-E region of Tucumán Plain in the N-W of Argentina (1994) J S. Am. Earth Sci, 7 (2), pp. 101-107
  • Pornposiello, M.C., Favetto, A., Sainato, C., Booker, J., Li, S., Imaging the sedimentary basin of the Tucumán Plain in the northern Pampean Ranges Argentina (2002) J. Appl. Geophys, 49, pp. 47-58
  • Pomposiello, M.C., Favetto, A., Booker, J., Sainato, C., Li, S., Smith, J., Giordanengo, G., Deep crust and mantle electrical conductivity structure of the Northern Sierras Pampeanas, Argentina (2002) 15° Congreso Geológico Argentino (El Calafate. Argentina), Actas, 1, pp. 369-372. , edited by N. Cabaleri et al, pp, Asoc. Geol. Argent, Buenos Aires
  • Ramos, V.A., Cristallini, E.O., Pérez, D.J., The Pampean flatslab of the central Andes (2002) J. S. Am. Earth Sci, 15, pp. 59-78
  • Rodi, W., Mackie, R., Nonlinear conjugate gradient algorithm for 2-D magnetotelluric inversion (2001) Geophysics, 66, pp. 174-178
  • Rossello, E.A., Pomposiello, M.C., Favetto, A., Mon, R., Mozetic, M.E., Evidencias graviméricas y sísmicas de reflexión de la prolongación oriental del Lineamiento Tucumán en el subsuelo de la Fosa de Tucumán (Argentina) (2001) paper presented at XI° Congreso Latinoamericano de Geología-III Congreso Uruguayo de Geología, , Soc. Nac. de Miner. y Geol, Montevideo, Uruguay
  • Ruiz Huidobro, O., El Horizonte Calcáreo Dolomítico en la Prov. de Tucumán (1960) Acta Geol. Lilloana, 3, pp. 147-171
  • Russo, A., Ferello, R.E., Chebli, G., Cuenca Chacopampena. Geología. Regional Argentina (1979) paper presented at 2nd Simposio De Geologia Reginal Argentina, Acad. Nac. de Cienc, , Córdoba, Spain
  • Sayago, J.M., Powel, J., Esteban, G., Collantes, M.M., Informe preliminary sobre la bioestratigrafía y paleomorfología de los sedimentos loesicos de La Angostura Tafi del Valle, Provincia de Tucumán, Argentina (1987) paper presented at X Congreso Geológico Argentino, Asoc. Geol. Argent, , San Miguel de Tucumán, Argentina
  • Schalamuk, I., Dalla Salda, L., Angelelli, V., Fernández, R., Etcheverry, R., Rocas máficas y ultramáficas. Petrología y mineralización. La geología de la Sierra de Ancasti (1983) Muenstersche Foersch. Geol. Palaeontol, 59, pp. 113-136
  • Smith, J.T., Booker, J., Rapid inversion of two- and three-dimensional magnetotelluric data (1991) J. Geophys. Res, 96, pp. 3905-3922
  • Swift, C.M., (1967) A magnetotelluric investigation of electrical conductivity anomaly in the southwestern United States, , Ph.D. thesis, Mass. Inst. of Technol, Cambridge
  • Urreiztieta, M., de Gapais, D., Le Corre, C., Cobbold, P.R., Rossello, E.A., Cenozoic dextral transpression and basin development at the southern edge of the Altiplano-Puna, northwestern Argentina (1996) Tectonophysics, 254, pp. 17-39

Citas:

---------- APA ----------
Favetto, A., Pomposiello, C., Booker, J. & Rossello, E.A. (2007) . Magnetotelluric inversion constrained by seismic data in the Tucumán Basin (Andean Foothills, 27°S, NW Argentina). Journal of Geophysical Research: Solid Earth, 112(9).
http://dx.doi.org/10.1029/2006JB004455
---------- CHICAGO ----------
Favetto, A., Pomposiello, C., Booker, J., Rossello, E.A. "Magnetotelluric inversion constrained by seismic data in the Tucumán Basin (Andean Foothills, 27°S, NW Argentina)" . Journal of Geophysical Research: Solid Earth 112, no. 9 (2007).
http://dx.doi.org/10.1029/2006JB004455
---------- MLA ----------
Favetto, A., Pomposiello, C., Booker, J., Rossello, E.A. "Magnetotelluric inversion constrained by seismic data in the Tucumán Basin (Andean Foothills, 27°S, NW Argentina)" . Journal of Geophysical Research: Solid Earth, vol. 112, no. 9, 2007.
http://dx.doi.org/10.1029/2006JB004455
---------- VANCOUVER ----------
Favetto, A., Pomposiello, C., Booker, J., Rossello, E.A. Magnetotelluric inversion constrained by seismic data in the Tucumán Basin (Andean Foothills, 27°S, NW Argentina). J. Geophys. Res. B Solid Earth. 2007;112(9).
http://dx.doi.org/10.1029/2006JB004455