Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy

This paper aims to contribute to the stratigraphic and geochronological knowledge of the Neogene–Quaternary of the geologic province of Tandilia by doing lithostratigraphic, paleomagnetic and paleontological analyses. Four lithostratigraphic units have been recognized. The oldest (Late Miocene) con...

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Autores principales: Gómez Samus, Mauro Leandro, Chimento Ortiz, Nicolás Roberto, Löffler, J., Rico, Yamile, Sierra, L., Bidegain, Juan Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Late Cenozoic
Loess
Argentina
Hiatus
Tandil
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/118685
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-118685
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Late Cenozoic
Loess
Argentina
Hiatus
Tandil
spellingShingle Ciencias Naturales
Late Cenozoic
Loess
Argentina
Hiatus
Tandil
Gómez Samus, Mauro Leandro
Chimento Ortiz, Nicolás Roberto
Löffler, J.
Rico, Yamile
Sierra, L.
Bidegain, Juan Carlos
Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy
topic_facet Ciencias Naturales
Late Cenozoic
Loess
Argentina
Hiatus
Tandil
description This paper aims to contribute to the stratigraphic and geochronological knowledge of the Neogene–Quaternary of the geologic province of Tandilia by doing lithostratigraphic, paleomagnetic and paleontological analyses. Four lithostratigraphic units have been recognized. The oldest (Late Miocene) constitutes a unit composed of colluvium deposits; it lays in erosional unconformity over the Neoproterozoic rocks. This unconformity is related to important events in the Andes during the Middle-Late Miocene. Over the oldest colluvial sediments, and placed in erosional unconformity, there are sediments assigned to the Barker Formation which are essentially fluvial deposits with a development of several paleosols. Owing to the fossil remains, this unit is assigned to the Montehermosan- Chapadmalalan Stage/Age, whereas the paleomagnetic record would correspond to C3A, Gilbert and Gauss chrons. So, the age is narrowed to the timespan 7.1–3.1 Ma (Late Miocene–Early Pliocene). The Vela Formation lays in erosional unconformity over the Barker Formation. It also has fluvial origin, while the youngest unit (Las Ánimas Formation) corresponds to loess. Both units provide normal polarity and were assigned to Brunhes chron (\0.78 Ma). The Vela Formation presents fossil remains from Bonaerian- Lujanian Stage/Age and belongs to the Middle Pleistocene. The hiatus between the Barker and Vela Formations seems to be considerable: it represents at least 2.6 million years. The reason for the lack of sedimentary records is still a matter of discussion. The deposition of Las Animas Formation seems to span the last 40,000 years. However, this could be linked to a major entrance of windcarried sediments during dry periods, including the Last Glacial Maximum. The hiatus between the Vela and Las A ´ nimas Formations may have been over 100,000 years.This paper aims to contribute to the stratigraphic and geochronological knowledge of the Neogene–Quaternary of the geologic province of Tandilia by doing lithostratigraphic, paleomagnetic and paleontological analyses. Four lithostratigraphic units have been recognized. The oldest (Late Miocene) constitutes a unit composed of colluvium deposits; it lays in erosional unconformity over the Neoproterozoic rocks. This unconformity is related to important events in the Andes during the Middle-Late Miocene. Over the oldest colluvial sediments, and placed in erosional unconformity, there are sediments assigned to the Barker Formation which are essentially fluvial deposits with a development of several paleosols. Owing to the fossil remains, this unit is assigned to the Montehermosan- Chapadmalalan Stage/Age, whereas the paleomagnetic record would correspond to C3A, Gilbert and Gauss chrons. So, the age is narrowed to the timespan 7.1–3.1 Ma (Late Miocene–Early Pliocene). The Vela Formation lays in erosional unconformity over the Barker Formation. It also has fluvial origin, while the youngest unit (Las Ánimas Formation) corresponds to loess. Both units provide normal polarity and were assigned to Brunhes chron (\0.78 Ma). The Vela Formation presents fossil remains from Bonaerian- Lujanian Stage/Age and belongs to the Middle Pleistocene. The hiatus between the Barker and Vela Formations seems to be considerable: it represents at least 2.6 million years. The reason for the lack of sedimentary records is still a matter of discussion. The deposition of Las Animas Formation seems to span the last 40,000 years. However, this could be linked to a major entrance of windcarried sediments during dry periods, including the Last Glacial Maximum. The hiatus between the Vela and Las Ánimas Formations may have been over 100,000 years.
format Articulo
Articulo
author Gómez Samus, Mauro Leandro
Chimento Ortiz, Nicolás Roberto
Löffler, J.
Rico, Yamile
Sierra, L.
Bidegain, Juan Carlos
author_facet Gómez Samus, Mauro Leandro
Chimento Ortiz, Nicolás Roberto
Löffler, J.
Rico, Yamile
Sierra, L.
Bidegain, Juan Carlos
author_sort Gómez Samus, Mauro Leandro
title Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy
title_short Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy
title_full Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy
title_fullStr Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy
title_full_unstemmed Neogene-Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy
title_sort neogene-quaternary in tandilia, south america: litho- bio- magnetostratigraphy
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/118685
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