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

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 firs...

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Autores principales: Zambrano, O., Rapalini, A.E., Dávila, F.M., Astini, R.A., Spagnuolo, C.M.
Formato: JOUR
Materias:
Cenozoic
Central Andes
Foreland basin
Magnetostratigraphy
Paleomagnetism
block rotation
deformation mechanism
foreland basin
geochronology
magnetic reversal
magnetostratigraphy
Miocene
orogeny
paleomagnetism
remanent magnetization
sedimentation rate
Andes
Argentina
Sierras Pampeanas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p591_Zambrano
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14373254_v100_n2_p591_Zambrano
record_format dspace
spelling todo:paper_14373254_v100_n2_p591_Zambrano2023-10-03T16:15:57Z Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland Zambrano, O. Rapalini, A.E. Dávila, F.M. Astini, R.A. Spagnuolo, C.M. 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 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. Fil:Zambrano, O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Spagnuolo, C.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p591_Zambrano
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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
topic_facet 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
description 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.
format JOUR
author Zambrano, O.
Rapalini, A.E.
Dávila, F.M.
Astini, R.A.
Spagnuolo, C.M.
author_facet Zambrano, O.
Rapalini, A.E.
Dávila, F.M.
Astini, R.A.
Spagnuolo, C.M.
author_sort Zambrano, O.
title Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland
title_short Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland
title_full Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland
title_fullStr Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland
title_full_unstemmed Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: Basement partitioning and minor block rotation in Argentine broken foreland
title_sort magnetostratigraphy and paleomagnetism of early and middle miocene synorogenic strata: basement partitioning and minor block rotation in argentine broken foreland
url http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p591_Zambrano
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