Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation
Marine sedimentary rocks of the lower Miocene Monte León Formation of southeastern Patagonia (Austral Basin), Argentina are important geological archives for better understanding regional tectonics, paleoenvironments, oceanography, and climate. In this paper, we describe assemblages of invertebrates...
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ftconicet:oai:ri.conicet.gov.ar:11336/113024 2023-10-09T21:55:26+02:00 Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation Parras, Ana Maria Guerstein, Gladys Raquel Perez Panera, Juan Pablo Griffin, Miguel Nañez, Carolina Adela Cusminsky, Gabriela Catalina Quiroga, Analisa application/pdf http://hdl.handle.net/11336/113024 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0031018220301462 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2020.109701 http://hdl.handle.net/11336/113024 Parras, Ana Maria; Guerstein, Gladys Raquel; Perez Panera, Juan Pablo; Griffin, Miguel; Nañez, Carolina Adela; et al.; Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 3-2020 0031-0182 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ PALEOENVIRONMENTS INVERTEBRATES PALYNOMORPHS CALCAREOUS MICROFOSSILS NEOGENE CALCAREOUS NANNOFOSSILS SOUTHERN SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.palaeo.2020.109701 2023-09-24T18:17:36Z Marine sedimentary rocks of the lower Miocene Monte León Formation of southeastern Patagonia (Austral Basin), Argentina are important geological archives for better understanding regional tectonics, paleoenvironments, oceanography, and climate. In this paper, we describe assemblages of invertebrates, palynomorphs, foraminifera, ostracods and calcareous nannofossils in a stratigraphical and sedimentological framework, which suggest deposition during a transgressive-regressive cycle. From base to top, the lowermost outcropping deposits of the Punta Entrada Member represent an inner shelf environment, formed during a transgressive phase. The zone of maximum flooding is marked by a high diversity of protoperidinaceans (heterotrophic) and offshore dinoflagellate cysts, an increase in the percentage and size of planktonic foraminifera, and a decrease in shallow water benthic foraminifera. Regressive deposits in higher parts of the Punta Entrada Member exhibit a progradational stratal stacking pattern and are characterized by an upward decrease in bioturbation and in the content of marine invertebrates; the dinoflagellate cyst assemblages point toward shallower and more restricted marine conditions than in underlying deposits. The cycle ends with the Monte Observación Member, which contains an impoverished and mostly reworked fauna of invertebrates. The presence of monospecific reefs of Crassostrea orbignyi, the decrease in dinoflagellate cysts and calcareous microfossils diversity, and the increase of continental palynomorphs suggest progressively shallower conditions and increasing influence of freshwater discharge. Although eustatic controls could have contributed to the sedimentary evolution of the Monte León Formation, the upward regressive trend is interpreted as the result of tectonism linked to the Andean orogeny, which led to the uplift, exhumation, and erosion of the highlands in the west. This is supported by the abundance of pyroclastic material, together with reworked specimens of Upper Cretaceous forams ... Article in Journal/Newspaper Planktonic foraminifera CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Austral Patagonia Argentina Entrada ENVELOPE(-60.552,-60.552,-62.998,-62.998) punta Entrada ENVELOPE(-60.552,-60.552,-62.998,-62.998) Palaeogeography, Palaeoclimatology, Palaeoecology 556 109701 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
PALEOENVIRONMENTS INVERTEBRATES PALYNOMORPHS CALCAREOUS MICROFOSSILS NEOGENE CALCAREOUS NANNOFOSSILS SOUTHERN SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
PALEOENVIRONMENTS INVERTEBRATES PALYNOMORPHS CALCAREOUS MICROFOSSILS NEOGENE CALCAREOUS NANNOFOSSILS SOUTHERN SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Parras, Ana Maria Guerstein, Gladys Raquel Perez Panera, Juan Pablo Griffin, Miguel Nañez, Carolina Adela Cusminsky, Gabriela Catalina Quiroga, Analisa Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation |
topic_facet |
PALEOENVIRONMENTS INVERTEBRATES PALYNOMORPHS CALCAREOUS MICROFOSSILS NEOGENE CALCAREOUS NANNOFOSSILS SOUTHERN SOUTH AMERICA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Marine sedimentary rocks of the lower Miocene Monte León Formation of southeastern Patagonia (Austral Basin), Argentina are important geological archives for better understanding regional tectonics, paleoenvironments, oceanography, and climate. In this paper, we describe assemblages of invertebrates, palynomorphs, foraminifera, ostracods and calcareous nannofossils in a stratigraphical and sedimentological framework, which suggest deposition during a transgressive-regressive cycle. From base to top, the lowermost outcropping deposits of the Punta Entrada Member represent an inner shelf environment, formed during a transgressive phase. The zone of maximum flooding is marked by a high diversity of protoperidinaceans (heterotrophic) and offshore dinoflagellate cysts, an increase in the percentage and size of planktonic foraminifera, and a decrease in shallow water benthic foraminifera. Regressive deposits in higher parts of the Punta Entrada Member exhibit a progradational stratal stacking pattern and are characterized by an upward decrease in bioturbation and in the content of marine invertebrates; the dinoflagellate cyst assemblages point toward shallower and more restricted marine conditions than in underlying deposits. The cycle ends with the Monte Observación Member, which contains an impoverished and mostly reworked fauna of invertebrates. The presence of monospecific reefs of Crassostrea orbignyi, the decrease in dinoflagellate cysts and calcareous microfossils diversity, and the increase of continental palynomorphs suggest progressively shallower conditions and increasing influence of freshwater discharge. Although eustatic controls could have contributed to the sedimentary evolution of the Monte León Formation, the upward regressive trend is interpreted as the result of tectonism linked to the Andean orogeny, which led to the uplift, exhumation, and erosion of the highlands in the west. This is supported by the abundance of pyroclastic material, together with reworked specimens of Upper Cretaceous forams ... |
format |
Article in Journal/Newspaper |
author |
Parras, Ana Maria Guerstein, Gladys Raquel Perez Panera, Juan Pablo Griffin, Miguel Nañez, Carolina Adela Cusminsky, Gabriela Catalina Quiroga, Analisa |
author_facet |
Parras, Ana Maria Guerstein, Gladys Raquel Perez Panera, Juan Pablo Griffin, Miguel Nañez, Carolina Adela Cusminsky, Gabriela Catalina Quiroga, Analisa |
author_sort |
Parras, Ana Maria |
title |
Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation |
title_short |
Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation |
title_full |
Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation |
title_fullStr |
Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation |
title_full_unstemmed |
Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation |
title_sort |
integrated stratigraphy and paleontology of the lower miocene monte león formation, southeastern patagonia, argentina: unraveling paleonvironmental changes and factors controlling sedimentation |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/113024 |
long_lat |
ENVELOPE(-60.552,-60.552,-62.998,-62.998) ENVELOPE(-60.552,-60.552,-62.998,-62.998) |
geographic |
Austral Patagonia Argentina Entrada punta Entrada |
geographic_facet |
Austral Patagonia Argentina Entrada punta Entrada |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0031018220301462 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2020.109701 http://hdl.handle.net/11336/113024 Parras, Ana Maria; Guerstein, Gladys Raquel; Perez Panera, Juan Pablo; Griffin, Miguel; Nañez, Carolina Adela; et al.; Integrated stratigraphy and paleontology of the lower Miocene Monte León Formation, southeastern Patagonia, Argentina: Unraveling paleonvironmental changes and factors controlling sedimentation; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 3-2020 0031-0182 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.palaeo.2020.109701 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
556 |
container_start_page |
109701 |
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1779319338954653696 |