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Abstract:

A paleomagnetic study on several carbonatic units (limestones to dolomites) of the Argentine Precordillera, spanning the Middle Cambrian to Arenig, is reported. Sampling was done at 23 sites (140 samples) in five localities of the Eastern Precordillera of San Juan province: Zonda (1), Juan Pobre (2) and La Flecha (3) creeks, Loma Redonda (4) and Cerro Pedernal de los Berros (5). Standard AF and thermal demagnetization indicated two different magnetic behaviors. Samples from localities 1 and 2 showed a single, post-tectonic magnetic component attributed to a Recent viscous or chemical remagnetization. Samples from localities 3 to 5 showed two magnetic components: a low unblocking temperature (350°C) magnetization coincident with that found at the previous localities and a high temperature one (up to 500°C). This second component was also found to be post-folding (post-Devonian?) and its in situ mean direction is Dec: 277.1°, Inc: 69.4, α95: 9.3°, N = 10. This is not consistent with any expected direction for the study area between Carboniferous and Recent times. It is therefore inferred that the rocks carrying it underwent substantial tectonic rotation since its recording. Comparison with the magnetization carried by similar Early Ordovician limestones in the Central Precordillera and the San Rafael Block, and assigned to a Permian remagnetizing event, suggests that the same process affected the carbonatic rocks in the Eastern Precordillera and, therefore, the age of the component is likely Permian. Restoration of the in situ mean direction to the expected direction for a Permian remagnetization can be obtained by a 40° ccw rotation around an axis plunging 30° to N30°E. This is compatible with uplifting of the Eastern Precordillera as a series of quasi-rigid blocks along a major E dipping N to NE backthrust during the Andean orogeny. © 2000 Elsevier Science B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block
Autor:Rapalini, A.E.; Bordonaro, O.; Berquo, T.S.
Filiación:CONICET, Depto. De Ciencias Geológicas, Ciudad Universitaria, 1428 Buenos Aires, Argentina
CRICYT, CC 131, 5500 Mendoza, Argentina
Instituto Astronomico E Geofisico, Universidade De Sao Paulo, Sao Paulo, Brazil
Palabras clave:Andes; Argentina; Paleomagnetism; Precordillera; Remagnetization; Uplift; Cambrian; cordillera; Ordovician; paleomagnetism; uplift; Argentina
Año:2000
Volumen:326
Número:1-2
Página de inicio:173
Página de fin:184
DOI: http://dx.doi.org/10.1016/S0040-1951(00)00152-9
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v326_n1-2_p173_Rapalini

Referencias:

  • Allmendinger, R.W., Figueroa, D., Sydner, D., Beer, J., Mpodizis, C., Isacks, B.L., Foreland shortening and crustal balancing in the Andes at 30°S latitude (1990) Tectonics, 9, pp. 789-809
  • Astini, R.A., Benedetto, J.L., Vaccari, N.E., The early Paleozoic evolution of the Argentine Precordillera as a Laurentian rifted, drifted and collided terrane: A geodynamic model (1995) Geol. Soc. Am. Bull, 107 (3), pp. 253-273
  • Astini, R.A., Vaccari, N.E., Canas, F.L., Benedetto, J.L., Brussa, E.D., Carrera, M.G., (1995) The Argentine Precordillera: A Laurentian Terrane? Field Guide 2, Penrose Conference, p. 34. , San Juan, Argentina
  • Baldis, B., Bordonaro, O., Cámbrico y Ordovicio en la Sierra Chica de Zonda y Cerro Pedernal provincia de San Juan. Génesis del margen continental en la Precordillera (1984) IX Congr. Geol. Arg, 4, pp. 190-207. , S.C. Bariloche, Argentina
  • Baldis, B., Chebli, G., Estructura profunda del area central de la Precordillera Sanjuanina (1969) J. Geol. Arg, 1, pp. 47-65. , 4
  • Baldis, B.A., Beresi, M.S., Bordonaro, O., Vaca, A., Sintesis evolutiva de la Precordillera argentina (1982) V Congr. Latinoam. Geol, 4, pp. 399-441
  • Baldis, B., Beresi, M., Bordonaro, O., Vaca, A., The Argentine Precordillera as a key to Andean structure (1984) Episodes, 7 (3), pp. 14-19
  • Baraldo, J.A., Cardinali, A.L., Weidman, R.O., Analisis de la fracturacion presente en el extremo sur de la Precordillera oriental sanjuanina (1996) XIII Congr. Geol. Arg, 2, pp. 195-208. , Buenos Aires. Argentina
  • Benedetto, J.L., Carrera, M.G., Sanchez, T.M., The evolution of faunal provincialism in the Argentine Precordillera during the Ordovician: New evidence and paleontological implications (1995) Society of Economics Paleontologist and Mineralogist, pp. 181-184. , Ordovician Odyssey- Pacific Section, Cooper J.D., Droser M.L., Finney S.C., (Eds.). Tulsa, OK Book 77
  • Bordonaro, O., El Cambrico en la quebrada de Zonda, provincia de San Juan (1980) Rev. Asoc. Geol. Arg, 35 (1), pp. 26-40
  • Cardinali, A.L., Geometria y evolucion de las estructuras de falla en las inmediaciones de la quebrada de Las Lajas (1997) J. Geol. Precordillera, 1, pp. 192-196. , Sierra Chica de Zonda, San Juan San Juan, Argentina II
  • Cardinali, A.L., Cabalgamiento regional terminado en un par anticlinal-sinclinal en el area del dique de Ullum (1999) XIV Congr. Geol. Arg, 1, pp. 216-218. , San Juan
  • 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
  • Dalziel, I.W.D., Neoproterozoic-Paleozoic geography and tectonics: Review, hypothesis, environmental speculation (1997) Geol. Soc. Am. Bull, 109, pp. 16-42
  • Day, R., Fuller, M.D., Schmidt, V.A., Hysteresis properties of titanomagnetites: Grain size and composition dependence (1977) Phys. Earth Planet. Int, 13, pp. 260-267
  • Dickerson, P.W., Keller, M., The Argentine Precordillera: Its odyssey from the Laurentian Ouachita margin towards the Sierras Pampeanas of Gondwana (1998) Geol. Soc. Spec, 142, pp. 85-106. , Pankhurst, R.J., Rapela, C.W. (Eds.). The Proto-Andean Margin of Gondwana Publ
  • Gardini, M., Estructura superficial y profunda del valle de Zonda (1993) XII Congr. Geol. Arg, 3, pp. 93-99. , Precordillera de San Juan
  • Introcaso, A., Pacino, M.C., Fraga, H., Gravity, isostasy and Andean crustal shortening, between latitudes 30 and 35°S (1992) Tectonophysics, 205, pp. 31-48
  • Jackson, M., Diagenetic sources of stable remanence in remagnetized Paleozoic cratonic carbonates: A rock magnetic study (1990) J. Geophys. Res, 95 B (3), pp. 2753-2761
  • Jordan, T.E., Isacks, B.L., Ramos, V.A., Allmendinger, R.W., Mountain building in the Central Andes (1983) Episodes, 3, pp. 20-26
  • Jordan, T.E., Isacks, B.L., Allmendinger, R.W., Brewer, J.A., Ramos, V.A., Ando, C.J., Andean tectonics related to geometry of the subducted Nazca plate (1983) Geol. Soc. Am. Bull, 94, pp. 341-361
  • Kirshvink, J.L., The least-squares line and plane and the analysis of palaeomagnetic data (1980) Geophys J.R. Astron. Soc, 62, pp. 699-718
  • Mahlburg Kay, S.M., Orrell, S., Abruzzi, J.M., Zircon and whole rock Nd-Pb isotopic evidence for a Grenville age and Laurentian origin for the basement of the Precordilleran terrane in Argentina (1996) J. Geol, 104, pp. 637-648
  • McCabe, C., Elmore, R.D., The occurence and origin of Late Paleozoic remagnetization in the sedimentary rocks of North America (1989) Rev. Geophys, 27 (4), pp. 471-494
  • McFadden, P.L., McElhinny, M.W., The combined analysis of remagnetization circles and direct observations in palaeomagnetism (1988) Earth Planet. Sci. Lett, 87, pp. 161-172
  • Ortiz, A., Zambrano, J.J., La provincia geologica de Precordillera Oriental (1981) VIII Congr. Geol. Arg, 3, pp. 59-74. , San Luis, Argentina
  • Peralta, S.H., Bordonaro, O., Beresi, M.S., (1995) The Argentine Precordillera: A Laurentian Terrane? Field Guide 1. Penrose Conference, p. 18. , San Juan, Argentina
  • Ramos, V.A., (1995) Field Guide to the Geology of Precordillera Folded and Thrust Belt: Andean Thrust Tectonics, , ICL. COMTEC. AGA. San Juan. Argentina
  • Ramos, V.A., Jordan, T.E., Allmendinger, R.W., Mpodozis, C., Kay, S.M., Cortes, J.M., Palma, M., Paleozoic terranes of the Central Argentine-Chilean Andes (1986) Tectonics, 5 (6), pp. 855-880
  • Rapalini, A.E., Astini, R.A., Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera (1998) Earth Planet. Sci. Lett, 155, pp. 1-14
  • Rapalini, A.E., Tarling, D.H., Multiple magnetizations in the Cambro-Ordovician carbonate platform of the Argentine Precordillera and their tectonic implications (1993) Tectonophysics, 227, pp. 49-62
  • Smalley, A., Basement seismicity beneath the Andean Precordillera thin-skinned thrust belt and implications for crustal and lithospheric behavior (1993) Tectonics, 12 (1), pp. 63-76
  • Thomas, W., Astini, R.A., The Argentine Precordillera: A traveler from the Ouachita embayment of North American Laurentia (1996) Science, 273, pp. 752-757
  • Truco, S., Rapalini, A.E., New evidence of a widespread Permian remagnetizing event in the central andean zone of Argentina (1996) 3rd Int. Symp. on Andean Geodynamics, pp. 799-802. , St. Malo, France. Ext. Abstr
  • von Gosen, W., Structural evolution of the Argentine Precordillera: The Rio San Juan section (1992) J. Struct. Geol, 14 (6), pp. 643-667
  • Von Gosen, W., Buggisch, W., A west-east transect across the Precordillera (Argentina) (1992) Zbl. Geol. Palaont, pp. 1597-1614
  • Zapata, T.R., Allmendinger, R.W., Growth stratal records of instantaneous and progressive limb rotation in the Precordillera thrust belt and Bermejo basin (1996) Tectonics, 15 (5), pp. 1065-1083. , Argentina

Citas:

---------- APA ----------
Rapalini, A.E., Bordonaro, O. & Berquo, T.S. (2000) . Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block. Tectonophysics, 326(1-2), 173-184.
http://dx.doi.org/10.1016/S0040-1951(00)00152-9
---------- CHICAGO ----------
Rapalini, A.E., Bordonaro, O., Berquo, T.S. "Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block" . Tectonophysics 326, no. 1-2 (2000) : 173-184.
http://dx.doi.org/10.1016/S0040-1951(00)00152-9
---------- MLA ----------
Rapalini, A.E., Bordonaro, O., Berquo, T.S. "Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block" . Tectonophysics, vol. 326, no. 1-2, 2000, pp. 173-184.
http://dx.doi.org/10.1016/S0040-1951(00)00152-9
---------- VANCOUVER ----------
Rapalini, A.E., Bordonaro, O., Berquo, T.S. Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block. Tectonophysics. 2000;326(1-2):173-184.
http://dx.doi.org/10.1016/S0040-1951(00)00152-9