New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications

In this contribution we address the current controversial issues related to the age, correlation, tectonic setting and paleogeographic links of the Cenozoic fossiliferous marine strata that crop out in the eastern sector of the North Patagonian Andes between 41° and 43°S based on new field (detailed...

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Autores principales: Bechis, F., Encinas, A., Concheyro, A., Litvak, V.D., Aguirre-Urreta, B., Ramos, V.A.
Formato: JOUR
Materias:
El Foyel Group
Nahuel Huapi Group
Neogene
North Patagonian Andes
Ñirihuau basin
Paleogene
age determination
biostratigraphy
Cenozoic
fold and thrust belt
fossil record
geochronology
Miocene
Oligocene
paleogeography
stratabound deposit
tectonic setting
transgression
Argentina
Atlantic Ocean
Patagonia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v52_n_p72_Bechis
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08959811_v52_n_p72_Bechis
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spelling todo:paper_08959811_v52_n_p72_Bechis2023-10-03T15:43:12Z New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications Bechis, F. Encinas, A. Concheyro, A. Litvak, V.D. Aguirre-Urreta, B. Ramos, V.A. El Foyel Group Nahuel Huapi Group Neogene North Patagonian Andes Ñirihuau basin Paleogene age determination biostratigraphy Cenozoic fold and thrust belt fossil record geochronology Miocene Neogene Oligocene Paleogene paleogeography stratabound deposit tectonic setting transgression Argentina Atlantic Ocean Patagonia In this contribution we address the current controversial issues related to the age, correlation, tectonic setting and paleogeographic links of the Cenozoic fossiliferous marine strata that crop out in the eastern sector of the North Patagonian Andes between 41° and 43°S based on new field (detailed geologic and structural mapping), geochronological (U-Pb LA-ICPMS analyses in zircons) and biostratigraphic (calcareous nannofossils studies) data. The marine strata form part of the volcano-sedimentary infill of several depocenters included in the Ñirihuau basin. We constrained the age of the main Cenozoic fossiliferous marine successions within the Early Miocene (23-16Ma). In addition, strata previously interpreted as deposited in marginal-marine environments suggest that the marine influence in the area could have lasted until the Middle Miocene. Our results indicate that the main depocenters of the basin evolved simultaneously during the Late Oligocene? to Miocene, and also give some clues about possible connections between them during distinctive stages of their evolution. We interpret that the marine transgressions registered in the Ñirihuau basin were related to a regional extensional tectonic stage that took place during the Oligocene to Early Miocene. The ingression of the sea occurred before the main contractional phase that gave place to the uplift of the North Patagonian Andes between the Early-Middle Miocene and the Pliocene, and the marine influence probably lasted until the early stages of the fold and thrust belt development. The marine strata can be correlated with one or more pulses of a major transgression that flooded a wide area of Patagonia between the Late Oligocene and the Middle Miocene. Considering the currently available data, a direct link of the Ñirihuau basin with the Atlantic Ocean on its northern, eastern or southern sides is unlikely. Marine connections would have taken place most likely with Pacific marine basins located to the west. © 2014 Elsevier Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v52_n_p72_Bechis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic El Foyel Group
Nahuel Huapi Group
Neogene
North Patagonian Andes
Ñirihuau basin
Paleogene
age determination
biostratigraphy
Cenozoic
fold and thrust belt
fossil record
geochronology
Miocene
Neogene
Oligocene
Paleogene
paleogeography
stratabound deposit
tectonic setting
transgression
Argentina
Atlantic Ocean
Patagonia
spellingShingle El Foyel Group
Nahuel Huapi Group
Neogene
North Patagonian Andes
Ñirihuau basin
Paleogene
age determination
biostratigraphy
Cenozoic
fold and thrust belt
fossil record
geochronology
Miocene
Neogene
Oligocene
Paleogene
paleogeography
stratabound deposit
tectonic setting
transgression
Argentina
Atlantic Ocean
Patagonia
Bechis, F.
Encinas, A.
Concheyro, A.
Litvak, V.D.
Aguirre-Urreta, B.
Ramos, V.A.
New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications
topic_facet El Foyel Group
Nahuel Huapi Group
Neogene
North Patagonian Andes
Ñirihuau basin
Paleogene
age determination
biostratigraphy
Cenozoic
fold and thrust belt
fossil record
geochronology
Miocene
Neogene
Oligocene
Paleogene
paleogeography
stratabound deposit
tectonic setting
transgression
Argentina
Atlantic Ocean
Patagonia
description In this contribution we address the current controversial issues related to the age, correlation, tectonic setting and paleogeographic links of the Cenozoic fossiliferous marine strata that crop out in the eastern sector of the North Patagonian Andes between 41° and 43°S based on new field (detailed geologic and structural mapping), geochronological (U-Pb LA-ICPMS analyses in zircons) and biostratigraphic (calcareous nannofossils studies) data. The marine strata form part of the volcano-sedimentary infill of several depocenters included in the Ñirihuau basin. We constrained the age of the main Cenozoic fossiliferous marine successions within the Early Miocene (23-16Ma). In addition, strata previously interpreted as deposited in marginal-marine environments suggest that the marine influence in the area could have lasted until the Middle Miocene. Our results indicate that the main depocenters of the basin evolved simultaneously during the Late Oligocene? to Miocene, and also give some clues about possible connections between them during distinctive stages of their evolution. We interpret that the marine transgressions registered in the Ñirihuau basin were related to a regional extensional tectonic stage that took place during the Oligocene to Early Miocene. The ingression of the sea occurred before the main contractional phase that gave place to the uplift of the North Patagonian Andes between the Early-Middle Miocene and the Pliocene, and the marine influence probably lasted until the early stages of the fold and thrust belt development. The marine strata can be correlated with one or more pulses of a major transgression that flooded a wide area of Patagonia between the Late Oligocene and the Middle Miocene. Considering the currently available data, a direct link of the Ñirihuau basin with the Atlantic Ocean on its northern, eastern or southern sides is unlikely. Marine connections would have taken place most likely with Pacific marine basins located to the west. © 2014 Elsevier Ltd.
format JOUR
author Bechis, F.
Encinas, A.
Concheyro, A.
Litvak, V.D.
Aguirre-Urreta, B.
Ramos, V.A.
author_facet Bechis, F.
Encinas, A.
Concheyro, A.
Litvak, V.D.
Aguirre-Urreta, B.
Ramos, V.A.
author_sort Bechis, F.
title New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications
title_short New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications
title_full New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications
title_fullStr New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications
title_full_unstemmed New age constraints for the Cenozoic marine transgressions of northwestern Patagonia, Argentina (41°-43° S): Paleogeographic andtectonic implications
title_sort new age constraints for the cenozoic marine transgressions of northwestern patagonia, argentina (41°-43° s): paleogeographic andtectonic implications
url http://hdl.handle.net/20.500.12110/paper_08959811_v52_n_p72_Bechis
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