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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Detalles Bibliográficos
Autores principales:	Spagnuolo, Cecilia Mariel, Rapalini, Augusto Ernesto
Publicado:	2015
Materias:	Las Arcas Formation Magnetostratigraphy Miocene Northwestern Argentina Paleomagnetism Sedimentation rate geochronology magnetization magnetostratigraphy paleomagnetism sedimentation rate Argentina Sierras Pampeanas
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v63_n_p101_Spagnuolo http://hdl.handle.net/20.500.12110/paper_08959811_v63_n_p101_Spagnuolo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08959811_v63_n_p101_Spagnuolo
record_format	dspace
spelling	paper:paper_08959811_v63_n_p101_Spagnuolo2023-06-08T15:48:48Z Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina Spagnuolo, Cecilia Mariel Rapalini, Augusto Ernesto 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v63_n_p101_Spagnuolo 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, Cecilia Mariel Rapalini, Augusto Ernesto 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.
author	Spagnuolo, Cecilia Mariel Rapalini, Augusto Ernesto
author_facet	Spagnuolo, Cecilia Mariel Rapalini, Augusto Ernesto
author_sort	Spagnuolo, Cecilia Mariel
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
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v63_n_p101_Spagnuolo http://hdl.handle.net/20.500.12110/paper_08959811_v63_n_p101_Spagnuolo
work_keys_str_mv	AT spagnuoloceciliamariel magnetostratigraphyofthemiocenelasarcasformationsantamariavalleynorthwesternargentina AT rapaliniaugustoernesto magnetostratigraphyofthemiocenelasarcasformationsantamariavalleynorthwesternargentina
_version_	1768545149487415296

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

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