Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina

The first magnetostratigraphic study of the Las Arcas Formation (Late Miocene) was carried out in Las Totoritas creek (26o12'S; 65o47'W, NW Argentina), a key place in between of two geological provinces: Northwestern Pampean Ranges and Eastern Cordillera, in northwestern Argentina. This wa...

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Autores principales: Spagnuolo, C.M., Georgieff, S.M., Rapalini, A.E.
Formato: JOUR
Materias:
Las Arcas Formation
Magnetostratigraphy
Miocene
Northwestern Argentina
Paleomagnetism
Sedimentation rate
geochronology
magnetization
magnetostratigraphy
paleomagnetism
sedimentation rate
Argentina
Sierras Pampeanas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v63_n_p101_Spagnuolo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08959811_v63_n_p101_Spagnuolo
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spelling todo:paper_08959811_v63_n_p101_Spagnuolo2023-10-03T15:43:16Z Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina Spagnuolo, C.M. Georgieff, S.M. Rapalini, A.E. Las Arcas Formation Magnetostratigraphy Miocene Northwestern Argentina Paleomagnetism Sedimentation rate geochronology magnetization magnetostratigraphy Miocene paleomagnetism sedimentation rate Argentina Argentina Sierras Pampeanas The first magnetostratigraphic study of the Las Arcas Formation (Late Miocene) was carried out in Las Totoritas creek (26o12'S; 65o47'W, NW Argentina), a key place in between of two geological provinces: Northwestern Pampean Ranges and Eastern Cordillera, in northwestern Argentina. This was accompanied by isotopic dating (9.01±0.12Ma, 40Ar-39Ar in amphibole) of the unit, obtained from a 3.4m thick tuff intercalated at ~45m above the base. The Las Arcas Formation is 810m thick at the sampling locality and it is mainly composed of tabular reddish conglomerates, sandstones and siltstones in both coarsening- and thickening-upward arrangements. The exposed section was sampled at 48 sites, 26 of which are interpreted as carrying primary magnetization. The new magnetostratigraphic column was correlated with the Geomagnetic Polarity Time Scale (GPTS), and suggests that deposition of the Las Arcas Formation strata started at around 9.1Ma and ended around 6.8Ma. The paleomagnetic pole obtained for this unit (Dec=8.7° Inc=-43.9° dp=14.9dm 9.3) indicates that this area underwent non-significant rotation (11.0°±13.6°) since the Late Miocene. © 2015 Elsevier Ltd. Fil:Spagnuolo, C.M. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v63_n_p101_Spagnuolo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Las Arcas Formation
Magnetostratigraphy
Miocene
Northwestern Argentina
Paleomagnetism
Sedimentation rate
geochronology
magnetization
magnetostratigraphy
Miocene
paleomagnetism
sedimentation rate
Argentina
Argentina
Sierras Pampeanas
spellingShingle Las Arcas Formation
Magnetostratigraphy
Miocene
Northwestern Argentina
Paleomagnetism
Sedimentation rate
geochronology
magnetization
magnetostratigraphy
Miocene
paleomagnetism
sedimentation rate
Argentina
Argentina
Sierras Pampeanas
Spagnuolo, C.M.
Georgieff, S.M.
Rapalini, A.E.
Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina
topic_facet Las Arcas Formation
Magnetostratigraphy
Miocene
Northwestern Argentina
Paleomagnetism
Sedimentation rate
geochronology
magnetization
magnetostratigraphy
Miocene
paleomagnetism
sedimentation rate
Argentina
Argentina
Sierras Pampeanas
description The first magnetostratigraphic study of the Las Arcas Formation (Late Miocene) was carried out in Las Totoritas creek (26o12'S; 65o47'W, NW Argentina), a key place in between of two geological provinces: Northwestern Pampean Ranges and Eastern Cordillera, in northwestern Argentina. This was accompanied by isotopic dating (9.01±0.12Ma, 40Ar-39Ar in amphibole) of the unit, obtained from a 3.4m thick tuff intercalated at ~45m above the base. The Las Arcas Formation is 810m thick at the sampling locality and it is mainly composed of tabular reddish conglomerates, sandstones and siltstones in both coarsening- and thickening-upward arrangements. The exposed section was sampled at 48 sites, 26 of which are interpreted as carrying primary magnetization. The new magnetostratigraphic column was correlated with the Geomagnetic Polarity Time Scale (GPTS), and suggests that deposition of the Las Arcas Formation strata started at around 9.1Ma and ended around 6.8Ma. The paleomagnetic pole obtained for this unit (Dec=8.7° Inc=-43.9° dp=14.9dm 9.3) indicates that this area underwent non-significant rotation (11.0°±13.6°) since the Late Miocene. © 2015 Elsevier Ltd.
format JOUR
author Spagnuolo, C.M.
Georgieff, S.M.
Rapalini, A.E.
author_facet Spagnuolo, C.M.
Georgieff, S.M.
Rapalini, A.E.
author_sort Spagnuolo, C.M.
title Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina
title_short Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina
title_full Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina
title_fullStr Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina
title_full_unstemmed Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina
title_sort magnetostratigraphy of the miocene las arcas formation, santa maría valley, northwestern argentina
url http://hdl.handle.net/20.500.12110/paper_08959811_v63_n_p101_Spagnuolo
work_keys_str_mv AT spagnuolocm magnetostratigraphyofthemiocenelasarcasformationsantamariavalleynorthwesternargentina
AT georgieffsm magnetostratigraphyofthemiocenelasarcasformationsantamariavalleynorthwesternargentina
AT rapaliniae magnetostratigraphyofthemiocenelasarcasformationsantamariavalleynorthwesternargentina
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