Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content

Byers Peninsula is located on the westernmost part of Livingston Island in the South Shetland Islands. Geologically this peninsula is recognized by the marine and non-marine sedimentary sequences and the Cretaceous-Tertiary volcanism, belonging to the uppermost levels of the Byers Group, named Cerro...

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Autores principales: Parica, C.A., Salani, F.M., Vera, E., Remesal, M., Césari, S.N.
Formato: JOUR
Materias:
Antarctica
Byers Peninsula
Cerro Negro Formation
Geochronology
Geology
Paleontology
Cretaceous
geochronology
igneous intrusion
paleontology
pyroclastic deposit
radiometric method
Livingston Island
South Shetland Islands
Cladophlebis
Elatocladus
Lueheia
Phyllopteroides
Pseudoctenis
Sphenopteris
Taeniopteris
Usnea
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v62_n4_p553_Parica2023-10-03T13:58:19Z Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content Parica, C.A. Salani, F.M. Vera, E. Remesal, M. Césari, S.N. Antarctica Byers Peninsula Cerro Negro Formation Geochronology Geology Paleontology Cretaceous geochronology igneous intrusion paleontology pyroclastic deposit radiometric method Antarctica Byers Peninsula Livingston Island South Shetland Islands Cladophlebis Elatocladus Lueheia Phyllopteroides Pseudoctenis Sphenopteris Taeniopteris Usnea Byers Peninsula is located on the westernmost part of Livingston Island in the South Shetland Islands. Geologically this peninsula is recognized by the marine and non-marine sedimentary sequences and the Cretaceous-Tertiary volcanism, belonging to the uppermost levels of the Byers Group, named Cerro Negro Formation. The magmatic sequences are divided in two main groups, pyroclastic rocks, divided into five units in the area. The second group of lavas and intrusive rocks placed at Don Carlos Hill, Usnea Plug, Chester Cone, Sealer Hill and Negro Hill. The sedimentary rocks are green clastic rocks (conglomerates, sandstones to mudstones) with rhythmic, convolute, thin bedded and crossed structures. The Cerro Negro Formation is related to a fluvial environment with a rain regime, high energy, decreasing in time, the development of lakes and shallow lagoons suitable for a good preservation of the macro and microflora. At the new fosiliferous localities, Rotch Dome, Lomada de las Plantas (Plants Hill), Don Carlos Hill and 904, have been recognized: Araucarítes sp., Archangelskya furcata Herbst, Cladophlebis sp., Dictyozamites sp., Elatocladus sp, Phyllopteroides sp., Pseudoctenis sp., Ptyllophyllum menendezii Cantrill, Sphenopteris sp., Eocyathea remesaliae Césari, Sergioa austrina Césari and Taeniopteris sp. Finally some new radiometric ages are presented for the pyroclastics, intrusions and lavas of the Cerro Negro Formation. Unit 1 was dated 125 ± 7 Ma, unit 2 (Don Carlos ignimbrites) 110 ± 30 (errocron) Ma the andesites of the Usnea Plug 92 ± 5 Ma. Two radiometric data were coincident in 63 ± 2 Ma for the Sealer eruptions. Finally, the youngest age Byers Peninsula, was obtained on the basalts from Don Carlos Hill (32 ± 1 Ma). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctica
Byers Peninsula
Cerro Negro Formation
Geochronology
Geology
Paleontology
Cretaceous
geochronology
igneous intrusion
paleontology
pyroclastic deposit
radiometric method
Antarctica
Byers Peninsula
Livingston Island
South Shetland Islands
Cladophlebis
Elatocladus
Lueheia
Phyllopteroides
Pseudoctenis
Sphenopteris
Taeniopteris
Usnea
spellingShingle Antarctica
Byers Peninsula
Cerro Negro Formation
Geochronology
Geology
Paleontology
Cretaceous
geochronology
igneous intrusion
paleontology
pyroclastic deposit
radiometric method
Antarctica
Byers Peninsula
Livingston Island
South Shetland Islands
Cladophlebis
Elatocladus
Lueheia
Phyllopteroides
Pseudoctenis
Sphenopteris
Taeniopteris
Usnea
Parica, C.A.
Salani, F.M.
Vera, E.
Remesal, M.
Césari, S.N.
Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content
topic_facet Antarctica
Byers Peninsula
Cerro Negro Formation
Geochronology
Geology
Paleontology
Cretaceous
geochronology
igneous intrusion
paleontology
pyroclastic deposit
radiometric method
Antarctica
Byers Peninsula
Livingston Island
South Shetland Islands
Cladophlebis
Elatocladus
Lueheia
Phyllopteroides
Pseudoctenis
Sphenopteris
Taeniopteris
Usnea
description Byers Peninsula is located on the westernmost part of Livingston Island in the South Shetland Islands. Geologically this peninsula is recognized by the marine and non-marine sedimentary sequences and the Cretaceous-Tertiary volcanism, belonging to the uppermost levels of the Byers Group, named Cerro Negro Formation. The magmatic sequences are divided in two main groups, pyroclastic rocks, divided into five units in the area. The second group of lavas and intrusive rocks placed at Don Carlos Hill, Usnea Plug, Chester Cone, Sealer Hill and Negro Hill. The sedimentary rocks are green clastic rocks (conglomerates, sandstones to mudstones) with rhythmic, convolute, thin bedded and crossed structures. The Cerro Negro Formation is related to a fluvial environment with a rain regime, high energy, decreasing in time, the development of lakes and shallow lagoons suitable for a good preservation of the macro and microflora. At the new fosiliferous localities, Rotch Dome, Lomada de las Plantas (Plants Hill), Don Carlos Hill and 904, have been recognized: Araucarítes sp., Archangelskya furcata Herbst, Cladophlebis sp., Dictyozamites sp., Elatocladus sp, Phyllopteroides sp., Pseudoctenis sp., Ptyllophyllum menendezii Cantrill, Sphenopteris sp., Eocyathea remesaliae Césari, Sergioa austrina Césari and Taeniopteris sp. Finally some new radiometric ages are presented for the pyroclastics, intrusions and lavas of the Cerro Negro Formation. Unit 1 was dated 125 ± 7 Ma, unit 2 (Don Carlos ignimbrites) 110 ± 30 (errocron) Ma the andesites of the Usnea Plug 92 ± 5 Ma. Two radiometric data were coincident in 63 ± 2 Ma for the Sealer eruptions. Finally, the youngest age Byers Peninsula, was obtained on the basalts from Don Carlos Hill (32 ± 1 Ma).
format JOUR
author Parica, C.A.
Salani, F.M.
Vera, E.
Remesal, M.
Césari, S.N.
author_facet Parica, C.A.
Salani, F.M.
Vera, E.
Remesal, M.
Césari, S.N.
author_sort Parica, C.A.
title Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content
title_short Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content
title_full Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content
title_fullStr Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content
title_full_unstemmed Geology of the Cerro Negro Formation (Cretaceous) in Livingston Island: Contributions to its geochronology and paleontological content
title_sort geology of the cerro negro formation (cretaceous) in livingston island: contributions to its geochronology and paleontological content
url http://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica
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AT salanifm geologyofthecerronegroformationcretaceousinlivingstonislandcontributionstoitsgeochronologyandpaleontologicalcontent
AT verae geologyofthecerronegroformationcretaceousinlivingstonislandcontributionstoitsgeochronologyandpaleontologicalcontent
AT remesalm geologyofthecerronegroformationcretaceousinlivingstonislandcontributionstoitsgeochronologyandpaleontologicalcontent
AT cesarisn geologyofthecerronegroformationcretaceousinlivingstonislandcontributionstoitsgeochronologyandpaleontologicalcontent
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