Artículo

La versión final de este artículo es de uso interno de la institución.
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

Jurassic volcanism in Patagonia is widespread. Although associated dyke swarms are conspicuous, they have been almost neglected in previous geologic studies of this region. Radiometric, paleomagnetic and magnetic anisotropy studies are reported from a Middle Jurassic basic to intermediate dyke swarm exposed in the Sierra de Mamil Choique (Western Patagonia) in an area of over 350 km2. Two whole-rock K/Ar determinations indicate that these dykes were intruded at around 170 Ma. An anisotropy of magnetic susceptibility (AMS) study on 15 dykes (74 block samples) shows that they carry different kinds of magnetic fabric (both normal and inverse), apparently governed by compositional differences. A paleomagnetic study of these samples suggests that Ti-poor titanomagnetite is the probable carrier to the characteristic remanence. Mean site characteristic directions pass a reversal test (grade C). A paleomagnetic pole, computed by averaging VGPs from each individual dyke, is situated at 70.2°S, 190.4°E (N = 13, α95 = 9.7°), not substantially apart from other Middle Jurassic poles from South America. Further refinement of the Jurassic South American apparent polar wander path is needed to establish whether or not the Mamil Choique dykes were affected by a small tectonic rotation. (C) 2000 Elsevier Science B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina
Autor:Rapalini, A.E.; Lopez De Luchi, M.
Filiación:Lab. Paleomagnetismo Daniel Valencio, Depto. Cie. Geologicas, FCEyN, U., Buenos Aires, Argentina
Ctro. Invest. en Recurs. Geologicos, CONICET, Ramirez Velasco 847, 1414, Buenos Aires, Argentina
Palabras clave:Dyke swarms; Jurassic; Magnetic fabric; Paleomagnetism; Patagonia; South America; dike; Jurassic; magnetic fabric; paleomagnetism; volcanism; Argentina
Año:2000
Volumen:120
Número:1
Página de inicio:11
Página de fin:27
DOI: http://dx.doi.org/10.1016/S0031-9201(00)00140-0
Título revista:Physics of the Earth and Planetary Interiors
Título revista abreviado:Phys. Earth Planet. Inter.
ISSN:00319201
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v120_n1_p11_Rapalini

Referencias:

  • Alric, V.I., Haller, M.J., Féraud, G., Bertrand, H., Zubia, M., Cronología 40Ar/ 39Ar del volcanismo Jurásico de la Patagonia extrandina (1996) Actas del Congreso Geologico Argentino, 13th, 5, pp. 243-250. , Buenos Aires
  • Beck, M.e.jr., Analysis of Late Jurassic - recent paleomagnetic data from active plate margins of South America (1988) Journal of South American Earth Sciences, 1, pp. 39-52
  • Cerredo, M.E., López De Luchi, M.G., Mamil Choique Granitoids, southwestern North Patagonian Massif, Argentina: Magmatism and metamorphism associated with a polyphasic evolution (1998) Journal of South American Earth Sciences, 11, pp. 499-515
  • Cisowski, S., Interacting vs. non-interacting single domain behaviour in natural and synthetic samples (1981) Physics of the Earth and Planetary Interiors, 26, pp. 56-62
  • Creer, K.M., Mitchell, J.G., Abou Deeb, J., Palaeomagnetism and radiometric age of the Jurassic Chon-Aike Formation form Santa Cruz province, Argentina: Implications for the opening of the South Atlantic (1972) Earth and Planetary Science Letters, 14, pp. 131-138
  • Dalla Salda, L., Varela, R., Cingolani, C., Aragón, E., The Río Chico Paleozoic Crystalline Complex and the evolution of Northern Patagonia (1994) Journal of South American Earth Sciences, 7, pp. 1-10
  • Dankers, P., Relationship between median destructive field and remanent coercive forces for dispersed natural magnetite, titanomagnetite and hematite (1981) Geophysical Journal of the Royal Astronomical Society, 64, pp. 447-461
  • Day, R., Fuller, M., Schmidt, V.A., Hysteresis properties of titanomagnetites: Grain size and compositional dependence (1977) Physics of the Earth and Planetary Interiors, 13, pp. 260-267
  • Ernst, R.E., Baragar, W.R.A., Evidence from magnetic fabric for the flow pattern of magma in the McKenzie giant radiating dyke swarm (1992) Nature, 356, pp. 511-513
  • Glen, J.M.G., Renne, P.R., Milner, S.C., Coe, R.S., Magma flow inferred from anisotropy of magnetic susceptibility in the Coastal Paraná-Etendeka igneous province: Evidence for rifting before flood volcanism (1997) Geology, 25, pp. 1131-1134
  • Gough, D.I., Brock, A., Jones, D.L., Opdyke, N.D., The palaeomagnetism of the ring complexes at Marangudzi and the Mateke hills (1964) Journal of Geophysical Research, 69, pp. 2499-2507
  • Hentorn, D.I., The magnetostratigraphy of the Lebombo Group along the Olifants river, Kruger National Park (1981) Annals of the Geological Survey (South Africa), 15 (2), pp. 1-10
  • Iglesia Llanos, M.P., Paleomagnetismo y magnetoestratigrafía del Pliensbaquiano-Toarciano (Jurásico) de la Cuenca Neuquina (1996) Revista de la Asociacion Geologica Argentina, 51, pp. 339-354
  • Iglesia Llanos, M.P., (1997) Magnetoestratigrafía Y Paleomagnetismo del Jurásico Inferior Marino de la Cuenca Neuquina, República Argentina, , PhD Thesis, University of Buenos Aires, Argentina, 337 pp
  • Irving, E., Irving, G.A., Apparent polar wander paths Carboniferous through Cenozoic and the assembly of Gondwana (1982) Geophysical Surveys, 5, pp. 141-188
  • Jelinek, V., Statistical processing of magnetic susceptibility measured in groups of specimens (1978) Studia Geophysica et Geodaetica, 22, pp. 50-62
  • Kirshvink, J.L., The least-squares line and plane and the analysis of palaeomagnetic data (1980) Geophysical Journal of the Royal Astronomical Society, 62, pp. 699-718
  • Knight, M.D., Walker, G.P.L., Magma flow directions in dikes of the Koolau complex Oahu, determined from magnetic fabric studies (1988) Journal of Geophysical Research, 93, pp. 4301-4319
  • Kosterov, A.A., Perrin, M., Paleomagnetism of the Lesotho basalt, southern Africa (1996) Earth and Planetary Science Letters, 139, pp. 63-78
  • Lesta, P., Ferello, R., Región extrandina de Chubut y Norte de Santa Cruz (1972) Geología Regional Argentina, Academia Nacional de Ciencias, Córdoba, Argentina, pp. 601-654. , A.F. Leanza
  • Le Maitre, R.W., Bateman, P., Dudek, A., Kelelr, J., Lameyre, J., Le Bas, M.J., Sabine, P.A., Zanettin, B., (1989) A Classification of the Igneous Rocks and Glossary of Terms, p. 193. , Oxford: Blackwell
  • López De Luchi, M.G., Cerredo, M.E., Metamorphism, deformation and related magmatism in the Río Chico area (1996) Actas del Congreso Geologico Argentino, 13th, 5, p. 533. , Buenos Aires
  • López De Lucchi, M., Rapalini, A.E., Jurassic dyke swarms in the Sierra de Mamil Choique, North Patagonian Massif: Lithology, age and paleomagnetism (1997) Simposio Final IGCP Proj. 345, Lithospheric Evolution of the Andes. VIII Cong. Geológico Chileno, Resumenes Expandidos, pp. 1679-1683
  • Lottes, A.L., Rowley, D.B., Reconstruction of the Laurasian and Gondwanan segments of Permian Pangaea (1990) Memoir - Geological Society, 12, pp. 383-395
  • MacFadden, P.L., McElhinny, M.W., Classification of the reversal test in palaeomagnetism (1990) Geophysical Journal International, 103, pp. 725-729
  • Mena, M., Correlación paleomagnética de diversos afloramientos del Complejo Marifil (provincia de Rio Negro) (1990) Revista de la Asociacion Geologica Argentina, 45, pp. 136-144
  • Nullo, F., Descripción geológica de la Hoja 41d, Lipetrén, Provincia del Río Negro (1978) Boletin del Servicio Geologico Nacional (Buenos Aires), 158. , 88 pp
  • Page, R., Page, S., Petrología y significado tectónico del Jurásico volcánico del Chubut Central (1993) Revista de la Asociacion Geologica Argentina, 48, pp. 41-58
  • Pankhurst, R.J., Rapela, C.R., Production of Jurassic rhyolites by anatexis of the lower crust of Patagonia (1995) Earth and Planetary Science Letters, 134, pp. 23-36
  • Pankhurst, R.J., Sruoga, P., Rapela, C.W., Estudio geocronológico Rb-Sr de los complejos Chon-Aike y El Quemado a los 47°30′ L.S. (1993) Actas del Congreso Geologico Argentino, 12th, 4, pp. 171-178. , Actas del Congreso de Exploracion de Hidrocarburos, 2nd
  • Potter, D.K., Stephenson, A., Single-domain particles in rocks and magnetic fabric analysis (1988) Geophysical Research Letters, 15, pp. 1097-1100
  • Rapalini, A.E., Abdeldayem, A.L., Tarling, D.H., Intracontinental movements in Western Gondwanaland: A palaeomagnetic test (1993) Tectonophysics, 220, pp. 127-139
  • Rapela, C.W., Pankhurst, R.J., The granites of northern Patagonia and the Gastre Fault System in relation to the break-up of Gondwana (1992) Magmatism and the Causes of Continental Break-up, 68, pp. 209-220. , B.C. Storey, T. Alabaster, Pankhurst R.J. UK: Geological Society of London. Special Publication
  • Rapela, C.W., Pankhurst, R.J., El volcanismo riolítico del noreste de la Patagonia: Un evento meso-jurásico de corta duración y origen profundo (1993) Actas del Congreso Geologico Argentino, 12th, 4, pp. 179-188. , Actas del Congreso de Exploracion de Hidrocarburos, Buenos Aires, 2nd
  • Raposo, M.I.B., Ernesto, M., Anisotropy of magnetic susceptibility in the Ponta Grossa dyke swarm (Brazil) and its relationship with magma flow direction (1995) Physics of the Earth and Planetary Interiors, 87, pp. 183-196
  • Ravazzoli, I., Sesana, F.L., Descripcion geológica de la Hoja 41c, Río Chico, Provincia de Río Negro (1977) Boletin del Servicio Geologico Nacional (Buenos Aires, Argentina), 148. , 80 pp
  • Rochette, P., Aubourg, C., Perrin, M., Is this magnetic fabric normal? A review and case studies in volcanic formations (1999) Tectonophysics, 307, pp. 219-234
  • Rochette, P., Jackson, M., Aubourg, C., Rock magnetism and the interpretation of anisotropy of magnetic susceptibility (1992) Reviews of Geophysics, 30, pp. 209-226
  • Schult, A., Guerreiro, S.D.C., Palaeomagnetism of Mesozoic igneous rocks from the Maranhao Basin, Brazil, and the timing of the opening of the South Atlantic (1979) Earth and Planetary Science Letters, 42, pp. 427-436
  • Tauxe, L., Gee, J.S., Staudigel, H., Flow directions in dikes from anisotropy of magnetic susceptibility data: The bootstrap way (1998) Journal of Geophysical Research, 103, pp. 17775-17790
  • Valencio, D.A., Vilas, J.F., Palaeomagnetism of some Middle Jurassic lavas from south-east Argentina (1970) Nature, 225, pp. 262-264
  • Van Der Voo, R., (1993) Paleomagnetism of the Atlantic, Tethys and Iapetus Oceans, , Cambridge: Cambridge Univ. Press. 411 pp
  • Vilas, J.F., Palaeomagnetism of some igneous rocks of the middle Jurassic Chon-Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina (1974) Geophysical Journal of the Royal Astronomical Society, 39, pp. 511-522
  • Vizán, H., (1993) Marco Geológico Y Paleomagnetismo-de Unidades de la Cuenca Liásica del Oeste del Chubut (Argentina), , PhD Thesis, University of Buenos Aires, Argentina, 200 pp
  • Vizán, H., Paleomagnetism of the Lepá and Osta Arena Formations (Lower Jurassic), Patagonia, Argentina (1998) Journal of South American Earth Sciences, 11, pp. 33-50

Citas:

---------- APA ----------
Rapalini, A.E. & Lopez De Luchi, M. (2000) . Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina. Physics of the Earth and Planetary Interiors, 120(1), 11-27.
http://dx.doi.org/10.1016/S0031-9201(00)00140-0
---------- CHICAGO ----------
Rapalini, A.E., Lopez De Luchi, M. "Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina" . Physics of the Earth and Planetary Interiors 120, no. 1 (2000) : 11-27.
http://dx.doi.org/10.1016/S0031-9201(00)00140-0
---------- MLA ----------
Rapalini, A.E., Lopez De Luchi, M. "Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina" . Physics of the Earth and Planetary Interiors, vol. 120, no. 1, 2000, pp. 11-27.
http://dx.doi.org/10.1016/S0031-9201(00)00140-0
---------- VANCOUVER ----------
Rapalini, A.E., Lopez De Luchi, M. Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina. Phys. Earth Planet. Inter. 2000;120(1):11-27.
http://dx.doi.org/10.1016/S0031-9201(00)00140-0