Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages

Palaeomagnetic data for a sequence of late Cenozoic sediments exposed at Bajada Martinez de Hoz and El Muelle (Barranca de los Lobos, Atlantic coastal area; Buenos Aires Province) are reported. The sequence comprises sediments assigned to the Chapadmalal Formation (Montehermosense land-mammal age),...

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Detalles Bibliográficos
Autor principal: Orgeira, M.J.
Formato: JOUR
Materias:
Brunhes
Cainozoic
Gauss
land mammal age
magnetostratigraphy
Matuyama
palaeomagnetism
Argentina, Buenos Aires, Barranca de los Lobos
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00319201_v64_n2-4_p121_Orgeira
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00319201_v64_n2-4_p121_Orgeira
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spelling todo:paper_00319201_v64_n2-4_p121_Orgeira2023-10-03T14:43:32Z Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages Orgeira, M.J. Brunhes Cainozoic Gauss land mammal age magnetostratigraphy Matuyama palaeomagnetism Argentina, Buenos Aires, Barranca de los Lobos Palaeomagnetic data for a sequence of late Cenozoic sediments exposed at Bajada Martinez de Hoz and El Muelle (Barranca de los Lobos, Atlantic coastal area; Buenos Aires Province) are reported. The sequence comprises sediments assigned to the Chapadmalal Formation (Montehermosense land-mammal age), Barranca de los Lobos, Vorohué and San Andrés Formations (Uquiense land-mammal age), Miramar Formation (Ensenadense land-mammal age), and Arroyo Seco and Arroyo Loberia Formations (Lujanense land-mammal age). The magnetostratigraphy recorded in the sequence suggests a Brunhes magnetic age (< 0.73 Ma) for the Arroyo Loberia and upper section of Arroyo Seco Formations; a late Matuyama magnetic age (1.67-0.73 Ma) for the lower section of the Arroyo Seco Formation; a Matuyama magnetic age (sensu lato 2.48-0.73 Ma) for the Miramar Formation; a Gauss magnetic age (sensu lato 3.40-2.48 Ma) for the San Andrés, Vorohué and Barranca de los Lobos formations; and an early Gauss to Gilbert magnetic age (> 3.15 Ma) for the Chapadmalal Formation. It also suggests a Brunhes to late Matuyama magnetic age for the Lujanense land-mammal age; a Matuyama magnetic age for the Ensenadense land-mammal age; a Gauss magnetic age for the Uquiense land-mammal age; and an early Gauss to Gilbert magnetic age for the Montehermosense land-mammal age. Finally, the results obtained suggest that the Panama Isthmus was formed at an age earlier than 3.0 Ma, possibly 4.0-3.5 Ma ago. © 1990. Fil:Orgeira, M.J. 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_00319201_v64_n2-4_p121_Orgeira
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Brunhes
Cainozoic
Gauss
land mammal age
magnetostratigraphy
Matuyama
palaeomagnetism
Argentina, Buenos Aires, Barranca de los Lobos
spellingShingle Brunhes
Cainozoic
Gauss
land mammal age
magnetostratigraphy
Matuyama
palaeomagnetism
Argentina, Buenos Aires, Barranca de los Lobos
Orgeira, M.J.
Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages
topic_facet Brunhes
Cainozoic
Gauss
land mammal age
magnetostratigraphy
Matuyama
palaeomagnetism
Argentina, Buenos Aires, Barranca de los Lobos
description Palaeomagnetic data for a sequence of late Cenozoic sediments exposed at Bajada Martinez de Hoz and El Muelle (Barranca de los Lobos, Atlantic coastal area; Buenos Aires Province) are reported. The sequence comprises sediments assigned to the Chapadmalal Formation (Montehermosense land-mammal age), Barranca de los Lobos, Vorohué and San Andrés Formations (Uquiense land-mammal age), Miramar Formation (Ensenadense land-mammal age), and Arroyo Seco and Arroyo Loberia Formations (Lujanense land-mammal age). The magnetostratigraphy recorded in the sequence suggests a Brunhes magnetic age (< 0.73 Ma) for the Arroyo Loberia and upper section of Arroyo Seco Formations; a late Matuyama magnetic age (1.67-0.73 Ma) for the lower section of the Arroyo Seco Formation; a Matuyama magnetic age (sensu lato 2.48-0.73 Ma) for the Miramar Formation; a Gauss magnetic age (sensu lato 3.40-2.48 Ma) for the San Andrés, Vorohué and Barranca de los Lobos formations; and an early Gauss to Gilbert magnetic age (> 3.15 Ma) for the Chapadmalal Formation. It also suggests a Brunhes to late Matuyama magnetic age for the Lujanense land-mammal age; a Matuyama magnetic age for the Ensenadense land-mammal age; a Gauss magnetic age for the Uquiense land-mammal age; and an early Gauss to Gilbert magnetic age for the Montehermosense land-mammal age. Finally, the results obtained suggest that the Panama Isthmus was formed at an age earlier than 3.0 Ma, possibly 4.0-3.5 Ma ago. © 1990.
format JOUR
author Orgeira, M.J.
author_facet Orgeira, M.J.
author_sort Orgeira, M.J.
title Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages
title_short Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages
title_full Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages
title_fullStr Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages
title_full_unstemmed Palaeomagnetism of late Cenozoic fossiliferous sediments from Barranca de los Lobos (Buenos Aires Province, Argentina). The magnetic age of the South American land-mammal ages
title_sort palaeomagnetism of late cenozoic fossiliferous sediments from barranca de los lobos (buenos aires province, argentina). the magnetic age of the south american land-mammal ages
url http://hdl.handle.net/20.500.12110/paper_00319201_v64_n2-4_p121_Orgeira
work_keys_str_mv AT orgeiramj palaeomagnetismoflatecenozoicfossiliferoussedimentsfrombarrancadeloslobosbuenosairesprovinceargentinathemagneticageofthesouthamericanlandmammalages
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