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Abstract:

Magnetostratigraphic and paleomagnetic studies on early Andean synorogenic strata (Del Crestón Fm.), in the Famatina Belt (28.7°S, 67.5°W) clarify details of chronology that permit calculation of sedimentation rates within the broken foreland of west Argentina. The Del Crestón Fm represents the first record of broken foreland sedimentation within the southern Central Andean belt and the earliest retroarc volcanic rocks exposed several hundred kilometers from the trench. Twenty-five out of 49 sites collected along the succession presented a primary remanence, as determined through positive fold and reversal tests. Correlation of the local magnetic polarity section with the global polarity time scale indicates that the sedimentation of Del Crestón Fm started at ~16.7 Ma and continued until ~14.5 Ma. The youngest strata are represented by conglomerates bearing abundant Lower Paleozoic granite boulders indicating unroofing of the crystalline basement within the NW Sierras Pampeanas. This result supports the hypothesis of an early broken foreland stage at these latitudes of the Andes, with involvement of the basement in deformation and coeval retroarc volcanism, common attributes of flat-subduction regimes. A mean site paleomagnetic direction of Dec: 6.3°, Inc: -43.6° (α95: 8.0°, N = 24) confirm our earlier intrepretation that the central part of the Famatina Belt within the Sierras Pampeanas did not undergo large vertical axes rotations since the Middle Miocene. © 2010 Springer-Verlag.

Registro:

Documento: Artículo
Título:Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland
Autor:Zambrano, O.; Rapalini, A.E.; Dávila, F.M.; Astini, R.A.; Spagnuolo, C.M.
Filiación:INGEODAV, Depto. Cs. Geológicas, F.C.E.yN., Universidad de Buenos Aires and CONICET, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Laboratorio de Análisis de Cuencas-CICTERRA-CONICET, Cátedra de Estratigrafía y Geología Histórica, Físicas y Naturales Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Av. Velez Sarsfield 1611, 2 Piso, Of. 7, X5016GCA Córdoba, Argentina
Instituto Antártico Argentino, Buenos Aires, Argentina
IESGLO, Instituto de Sedimentología, Fundación Miguel Lillo, Miguel Lillo 251, T4000JFE San Miguel de Tucumán, Argentina
Palabras clave:Cenozoic; Central Andes; Foreland basin; Magnetostratigraphy; Paleomagnetism; block rotation; Cenozoic; deformation mechanism; foreland basin; geochronology; magnetic reversal; magnetostratigraphy; Miocene; orogeny; paleomagnetism; remanent magnetization; sedimentation rate; Andes; Argentina; Sierras Pampeanas
Año:2011
Volumen:100
Número:2
Página de inicio:591
Página de fin:602
DOI: http://dx.doi.org/10.1007/s00531-010-0570-x
Título revista:International Journal of Earth Sciences
Título revista abreviado:Int. J. Earth Sci.
ISSN:14373254
CODEN:IJESF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14373254_v100_n2_p591_Zambrano

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Citas:

---------- APA ----------
Zambrano, O., Rapalini, A.E., Dávila, F.M., Astini, R.A. & Spagnuolo, C.M. (2011) . Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland. International Journal of Earth Sciences, 100(2), 591-602.
http://dx.doi.org/10.1007/s00531-010-0570-x
---------- CHICAGO ----------
Zambrano, O., Rapalini, A.E., Dávila, F.M., Astini, R.A., Spagnuolo, C.M. "Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland" . International Journal of Earth Sciences 100, no. 2 (2011) : 591-602.
http://dx.doi.org/10.1007/s00531-010-0570-x
---------- MLA ----------
Zambrano, O., Rapalini, A.E., Dávila, F.M., Astini, R.A., Spagnuolo, C.M. "Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland" . International Journal of Earth Sciences, vol. 100, no. 2, 2011, pp. 591-602.
http://dx.doi.org/10.1007/s00531-010-0570-x
---------- VANCOUVER ----------
Zambrano, O., Rapalini, A.E., Dávila, F.M., Astini, R.A., Spagnuolo, C.M. Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland. Int. J. Earth Sci. 2011;100(2):591-602.
http://dx.doi.org/10.1007/s00531-010-0570-x