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:

A pulaeomagnetic study was carried out in the Silurian-Devonian clastic sedimentary rocks of the Sierra Grande Formation, exposed in northeastern Patagonia (41.6°S, 65.3°W). Thirteen sites (n=88) were located on opposite limbs of a syncline-anticline structure. Stepwise thermal demagnetization permitted the identification of a very stable magnetic component of reversed polarity carried by hematite. Stepwise performance of the fold test yielded negative results both in situ and after 100% bedding correction, but positive after partial unfolding (19%). This indicates a syntectonic origin for the isolated magnetization. A pole position was computed for the partially (19%) corrected remanence: SG3: 77.3°S, 310.7°E, δp=7.7°, δm=6.6°, N=13. Its position is coincident with late Early to Late Permian palaeomagnetic poles from South America, suggesting that age for the previously undated folding of the Sierra Grande sequence and therefore for the main tectonic event that affected the northern boundary of Patagonia. Palaeozoic palaeomagnetic poles from Patagonia obtained to date agree with those from Gondwana of Devonian or younger age, suggesting that Patagonia did not undergo important displacements relative to South America since those times. This and the Permian age of deformation determined in this study invalidates tectonic models involving collision of a far-travelled Patagonia with Gondwana in the mid- or Late Palaeozoic.

Registro:

Documento: Artículo
Título:Syntectonic magnetization of the mid-Palaeozoic Sierra Grande formation: Further constraints on the tectonic evolution of Patagonia
Autor:Rapalini, A.E.
Filiación:Lab. Paleomagnetismo 'Daniel V., Departamento de Ciencias Geologicas, FCEyN - Universidad de Buenos Aires, 1428, Buenos Aires, Argentina
Palabras clave:Gondwana; Palaeomagnetism; Palaeozoic; Patagonia; Gondwana; magnetization; palaeomagnetism; Palaeozoic; tectonic evolution; Argentina, Patagonia; Chile, Patagonia
Año:1998
Volumen:155
Número:1
Página de inicio:105
Página de fin:114
DOI: http://dx.doi.org/10.1144/gsjgs.155.1.0105
Título revista:Journal of the Geological Society
Título revista abreviado:J. Geol. Soc.
ISSN:00167649
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167649_v155_n1_p105_Rapalini

Referencias:

  • Avila, J.C., Estructura geológica del Yacimiento Sur de Sierra Grande, provincia de Rio Negro (1980) Act Geologica Lilloana, 15, pp. 85-102
  • Bachtadse, V., Briden, J.C., Palaeomagnetism of Devonian ring complex from the Bayuda Desert, Sudan-new constraints on the apparent polar wander path for Gondwanaland (1991) Geophysical Journal International, 104, pp. 635-646
  • Beck, M.E., García, A., Burmester, R.F., Munizaga, F., Hervé, F., Drake, R., Paleomagnetism and geochronology of Late Paleozoic granitic rocks from the Lake District of southern Chile: Implications for accretionary tectonics (1991) Geology, 19, pp. 332-335
  • Caminos, R., Llambías, E.J., Rapela, C.W., Párica, C.A., Late Paleozoic-Early Triassic magmatic activity of Argentina and the significance of new Rb-Sr ages from northern Patagonia (1988) Journal of South American Earth Sciences, 1, pp. 137-146
  • Chen, Z., Li, Z.X., Powell, C.M., Balme, B.E., Palaeomagnetism of the Brewer conglomerate in central Australia, and fast plate movement during Late Devonian (1993) Geophysical Journal International, 115, pp. 564-574
  • An Early Carboniferous paleomagnetic pole for Gondwanaland: New results form the Mount Eclipse Sandstone in the Ngalia Basin, central Australia (1994) Journal of Geophysical Research, 99, pp. 2909-2924
  • Cobbold, P.R., Massabie, A.C., Rossello, E.A., Hercynina wrenching and thrusting in the Sierras Australes foldbelt. Argentina (1986) Hercynica, 11, pp. 135-148
  • Gapais, D., Rossello, E.A., Partitioning of transpressive motions within a sigmoidal foldbelt: The Variscan Sierras Australes. Argentina (1991) Journal of Structural Geology, 13, pp. 743-758
  • Conti, C.M., Rapalini, A.E., Vilas, J.F., Palaeomagnetism of the Silurian Lipeon Formation, NW Argentina, and the Gondwana apparent polar wander path (1995) Geophysical Journal International, 121, pp. 848-862
  • Dalla Salda, L., Cingolani, C., Varela, R., Early Paleozoic orogenic belt of the Andes in southwestern South America: Result of Laurentia-Gondwana collision? (1992) Geology, 20, pp. 617-620
  • Dalmayrac, B., Laubacher, G., Marocco, R., Martinez, C., Tomasi, P., La Chaine Hercynienne d'Amerique du Sud. Structure et evolution d'une orogene intracratonique (1980) Geologische Rundschau, 69, pp. 1-21
  • Ernesto, M., Diogo, L.A., Rocha-Campos, A.C., Paleomagnetic analysis of the Subandean Carboniferous ("Gondwana") sequence in Bolivia: Tectonic Implications (1991) Gondwana Seven Proceedings, Sao Paulo, Brazil, pp. 615-636
  • Haag, M., Heller, F., Late Permian to Early Triassic magnetostratigraphy (1991) Earth and Planetary Science Letters, 106, pp. 42-52
  • Halpern, M., Umpierre, M., Linares, E., Radiometric ages of Crystal-line rocks from southern South America as related to Gondwana an Andean Geologic Provinces (1970) Solid Earth Problems Conference, Buenos Aires, Argentina, 2, pp. 345-356
  • Japas, S., Caracterización geométrico-estructural del Grupo Pillahuincó: II. Formación Sauce Grande. Perfil del Cordón Mambacher y Sierra de las Tunas Occidental, Sierras Australes de Buenos Aires (1987) Anales Academia National de Ciencias Exactas Fisicas y Naturales, Buenos Aires, 39, pp. 125-144
  • Jesinkey, C., Forsythe, R.D., Mpodozis, C., Davidson, J., Concordant late Paleozoic palaeomagnetizations from the Atacama Desert: Implications for Tectonic models of the Chilean Andes (1987) Earth Planetary Science Letters, 85, pp. 461-472
  • Kay, S.M., Late Paleozoic tectonics in southern South America: A global perspective (1993) XII International Congress on Carboniferous Permian, Comptes Rendus, 1, pp. 109-122
  • Ramos, V.A., Mpodozis, C., Sruoga, P., Late Paleozoic to Jurassic-silicic magmatism at the Gondwana margin: Analogy to the Middle Proterozoic in North America? (1989) Geology, 17, pp. 324-328
  • Keidel, J., Sobre el desarrollo paleogeográfico de las grandes unidades geológicas de la Argentina (1925) Sociedad Argentina de Estratigrafia y Geografia, GAEA, Anales, 4, pp. 251-312
  • Llambías, E.J., Caminos, R., Rapela, C.W., Las plutonitas y vulcanitas del ciclo eruptivo Gondwánico (1984) IX Congreso Geológico Argentino, Relatorio, pp. 85-117
  • Lottes, A.L., Rowley, D.B., Reconstruction of the Laurasian and Gondwanan segments of Permian Pangaea (1990) Palaeozoic Palaeogeography and Biogeography, 12, pp. 383-395. , MCKERROW, W.S. & SCOTESE, C.R. (eds) Geological Society London, Memoirs
  • Martinez, C., (1980) Structure et Evolution de la Chaine Hercynienne et de la Chaine Andine Dans le Nord de la Cordillere des Andes de Bolivie, p. 119. , Documents de L'OSTROM
  • Mcelhinny, M.W., Statistical significance of the fold test in palaeomagnetism (1964) Geophysical Journal of the Royal Astronomical Society, 8, pp. 338-340
  • Mcfadden, P.L., A new fold test for palaeomagnetic studies (1990) Geophysical Journal International, 103, pp. 163-169
  • Jones, D.L., The fold test in palaeomagnetism (1981) Geophysical Journal of the Royal Astronomical Society, 67, pp. 53-58
  • Lowes, F.J., The discrimination of mean directions drawn from Fisher distributions (1981) Geophysical Journal of the Royal Astronomical Society, 67, pp. 19-33
  • Menning, M., A numerical time scale for the Permian and Triassic periods: An integrated time analysis (1995) The Permian of Northern Pangea, 1, pp. 77-97. , SCHOLLE, P.A., PERYT, T.M. & ULMERSCHOLLE, D.S. (eds) Springer-Verlag
  • Molina Garza, R.S., Geissman, J.W., Van Der Voo, R., Paleomagnetism of the Dewey Lake Formation (Late Permian), Northwest Texas, end of the Kiaman Superchron in North America (1989) Journal of Geophysical Research, 94, pp. 17881-17888
  • Montes Lauar, C.R., Pacca, I.G., Melfi, A.J., Piccirillo, E.M., Bellieni, G., Petrini, R., Rizzieri, R., The Anari and Tapirapua Jurassic Formations, wetern Brazil: Paleomagnetism, geochemistry and geochronology (1994) Earth and Planetary Science Letters, 128, pp. 357-371
  • Moreau, C., Demaiffe, D., Bellion, Y., Boullier, A.M., A tectonic model for the location of Palaeozoic ring complexes in Air (Niger, West Africa) (1994) Tectonophysics, 234, pp. 129-146
  • Nuñez, E., De Bachmann, E.W., Ravazzoli, I., Britos, A., Franchi, M., Lizuain, A., Sepulveda, E., Rasgos geológicos del sector oriental del Macizo de Somuncurá, prov. de Rio Negro, Rep. Argentina (1975) II Congreso Iberoamericano de Gologia Económica, 4, pp. 247-266
  • Pankhurst, R.J., Rapela, C.W., Caminos, R., Llambías, E., Párica, C., A revised age for the granites of the central Somuncura Batholith, North Patagonian Massif (1992) Journal of South American Earth Sciences, 5, pp. 321-325
  • Caminos, R., Raphla, C.W., Problemas geocronológicos de los granitoides Gondwanicos de Nahuel Niyeu, Macizo Norpatagónico (1993) XII Congreso Geológico Argentino, Mendoza, 4, pp. 99-104
  • Ramos, V.A., Patagonia: Un continente paleozoico a la deriva? (1984) IX Congreso Geológico Argentino, S. C. Bariloche, 2, pp. 311-325
  • Late Proterozoic-Early Paleozoic of South America - A collisional history (1988) Episodes, 11, pp. 168-174
  • Cortés, J.M., Estructura e interpretatión tectónica (1984) IX Congreso Geologico Argentino, Relatorio, pp. 317-346
  • Rapalini, A.E., Dextral transcurrent movements along the Northern boundary of Patagonia, suggested by paleomagnetic data (1989) 1st Congress of the Brazilian Geophysical Society, Rio de Janeiro, Annals, 3, pp. 950-955
  • Vilas, J.F., Preliminary paleomagnetic data from the Sierra Grande Formation: Tectonic consequences of the first Middle Paleozoic paleopoles from Patagonia (1991) Journal of South American Earth Sciences, 4, pp. 25-41
  • Tectonic rotations in the Late Palaeozoic continental margin of southern South America, determined and dated by palaeomagnetism (1991) Geophysical Journal International, 107, pp. 333-351
  • Bobbio, M.L., Valencio, D.A., Geodynamic interpretations from paleomagnetic data of Late Paleozoic rocks in the Southern Andes (1989) Deep Structure and Past Kinematics of Accreted Terranes, 50, pp. 41-57. , HILLHOUSE, J.W. (ed.) American Geophysical Union, Geophysical Monograph Series
  • Abdeldayem, A.L., Tarling, D.H., Intracontinental movements in Western Gondwanaland: A palaeomagnetic test (1993) Tectonophysics, 220, pp. 127-139
  • Tarling, D.H., Turner, P., Flint, S., Vilas, J.F., Palaeomagnetism of the Carboniferous Tepuel Group, Central Patagonia, Argentina (1994) Tectonics, 13, pp. 1277-1294
  • Schmidt, P.W., Powell, C.M., Li, Z.X., Thrupp, G.A., Reliability of Palaeozoic palaeomagnetic poles and APWP of Gondwanaland (1990) Tectonophysics, 184, pp. 87-100
  • Sellés Martinez, J., The relationship between Patagonian and South American blocks: Frontal collision or transpression? (1988) VII Gondwana Symposium, Sao Paulo, Brazil, Abstracts, p. 139
  • Tomezzoli, R.N., Vilas, J.F., Paleomagnetismo del Grupo Pillahiuncó en Sierra de la Ventana (Estancias Las Julianas y San Carlos) (1996) XIII Congreso Geológico Argentino, Buenos Aires, 2, pp. 481-488
  • Truco, S., Rapalini, A.E., New evidence of a widespread Permian remagnetizing event in the central Andean zone of Argentina (1996) Third International Symposium on Andean Geodynamics, St Malo, France, Extended Abstracts, pp. 799-802
  • Valencio, D.A., Mitchell, J., Edad polasio-argón y paleomagnetismo de rocas ígneas de las formaciones Quebrada del Pimiento y Las Cabras, provincia de Mendoza (1972) Revista de la Asociación Geológica Argentina, 24 (3), pp. 191-198
  • Vilas, J.F., Mendia, J.E., Paleomagnetism of a sequence of red beds of the middle and the upper sections of Paganzo Group (Argentina) and the correlation of upper Palaeozoic-lower Mesozoic rocks (1977) Geophysical Journal of the Royal Astronomical Society, 51, pp. 59-74
  • Van Der Voo, R., (1993) Paleomagnetism of the Atlantic, Tethys and Iapetus Oceans, , Cambridge University Press
  • True polar wander during the middle Paleozoic? (1994) Earth and Planetary Science Letters, 122, pp. 239-243
  • Varela, R., Dalla Salda, L., Cingolani, C., Gomez, V., Estructura, petrología y geocronología del basamento de la región del Limay, provin-cias de Río Negro y Neuquén, Argentina (1991) Revista Geológica de Chile, 18, pp. 147-163
  • Von Gosen, W., Buggisch, W., Dimieri, L.V., Structural and metamorphic evolution of the Sierras Australes Buenos Aires Province (Argentina) (1990) Geologische Rundschau, 79, pp. 797-821
  • Windhausen, A., (1931) Geologia Argentina. II Parte. Geología Histórica y Regional del Territorio Argentino, , Peusser, Bs. As
  • Zanettini, J.C., La Formación Sierra Grande (provincia de Rio Negro) (1981) Revista de la Asociación Geológica Argentina, 36, pp. 160-179

Citas:

---------- APA ----------
(1998) . Syntectonic magnetization of the mid-Palaeozoic Sierra Grande formation: Further constraints on the tectonic evolution of Patagonia. Journal of the Geological Society, 155(1), 105-114.
http://dx.doi.org/10.1144/gsjgs.155.1.0105
---------- CHICAGO ----------
Rapalini, A.E. "Syntectonic magnetization of the mid-Palaeozoic Sierra Grande formation: Further constraints on the tectonic evolution of Patagonia" . Journal of the Geological Society 155, no. 1 (1998) : 105-114.
http://dx.doi.org/10.1144/gsjgs.155.1.0105
---------- MLA ----------
Rapalini, A.E. "Syntectonic magnetization of the mid-Palaeozoic Sierra Grande formation: Further constraints on the tectonic evolution of Patagonia" . Journal of the Geological Society, vol. 155, no. 1, 1998, pp. 105-114.
http://dx.doi.org/10.1144/gsjgs.155.1.0105
---------- VANCOUVER ----------
Rapalini, A.E. Syntectonic magnetization of the mid-Palaeozoic Sierra Grande formation: Further constraints on the tectonic evolution of Patagonia. J. Geol. Soc. 1998;155(1):105-114.
http://dx.doi.org/10.1144/gsjgs.155.1.0105