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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ftunibueairesbd:todo:paper_00044822_v62_n4_p553_Parica 2023-10-29T02:32:32+01:00 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. https://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica unknown http://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Antarctica Byers Peninsula Cerro Negro Formation Geochronology Geology Paleontology Cretaceous igneous intrusion pyroclastic deposit radiometric method Livingston Island South Shetland Islands Cladophlebis Elatocladus Lueheia Phyllopteroides Pseudoctenis Sphenopteris Taeniopteris Usnea JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_00044822_v62_n4_p553_Parica 2023-10-05T01:33:05Z 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). Journal/Newspaper Antarc* Antarctica Livingston Island South Shetland Islands Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Antarctica Byers Peninsula Cerro Negro Formation Geochronology Geology Paleontology Cretaceous igneous intrusion pyroclastic deposit radiometric method Livingston Island South Shetland Islands Cladophlebis Elatocladus Lueheia Phyllopteroides Pseudoctenis Sphenopteris Taeniopteris Usnea |
spellingShingle |
Antarctica Byers Peninsula Cerro Negro Formation Geochronology Geology Paleontology Cretaceous igneous intrusion pyroclastic deposit radiometric method 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 igneous intrusion pyroclastic deposit radiometric method 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 |
Journal/Newspaper |
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 |
https://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica |
genre |
Antarc* Antarctica Livingston Island South Shetland Islands |
genre_facet |
Antarc* Antarctica Livingston Island South Shetland Islands |
op_relation |
http://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p553_Parica |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar |
op_doi |
https://doi.org/20.500.12110/paper_00044822_v62_n4_p553_Parica |
_version_ |
1781054147003416576 |