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Artículo

Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland

Zambrano Zambrano; Rapalini, Augusto ErnestoIcon ; Davila, Federico MiguelIcon ; Astini, Ricardo AlfredoIcon ; Spagnuolo, Cecilia MarielIcon
Fecha de publicación: 04/2011
Editorial: Springer
Revista: International Journal of Earth Sciences
ISSN: 1437-3254
e-ISSN: 1437-3262
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente

Resumen

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.
Palabras clave: Cenozoic , Central Andes , Foreland Basin , Magnetostratigraphy , Paleomagnetism
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/68798
DOI: http://dx.doi.org/10.1007/s00531-010-0570-x
URL: https://link.springer.com/article/10.1007%2Fs00531-010-0570-x
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Citación
Zambrano Zambrano; Rapalini, Augusto Ernesto; Davila, Federico Miguel; Astini, Ricardo Alfredo; Spagnuolo, Cecilia Mariel; Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland; Springer; International Journal of Earth Sciences; 100; 2; 4-2011; 591-602
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