New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina

Preliminary palaeomagnetic results from the Paleozoic volcanic units along the Gondwana margin in Argentina are presented. Even though we are still working on the palaeomagnetic data of the sampled section, these data are consistent with data from former studies carried out in the area. More than 90...

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Autor principal: Tomezzoli, Renata Nela
Publicado: 2009
Materias:
Choiyoi volcanism
Gondwana
Late Paleozoic
Palaeomagnetism
South America
deformation
geomagnetism
magnetic field
magnetic reversal
paleomagnetism
Paleozoic
Permian
remanent magnetization
volcanism
Argentina
La Pampa
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v61_n1_p183_Tomezzoli
http://hdl.handle.net/20.500.12110/paper_13438832_v61_n1_p183_Tomezzoli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_13438832_v61_n1_p183_Tomezzoli
record_format dspace
spelling paper:paper_13438832_v61_n1_p183_Tomezzoli2023-06-08T16:10:44Z New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina Tomezzoli, Renata Nela Choiyoi volcanism Gondwana Late Paleozoic Palaeomagnetism South America deformation geomagnetism Gondwana magnetic field magnetic reversal paleomagnetism Paleozoic Permian remanent magnetization volcanism Argentina La Pampa South America Preliminary palaeomagnetic results from the Paleozoic volcanic units along the Gondwana margin in Argentina are presented. Even though we are still working on the palaeomagnetic data of the sampled section, these data are consistent with data from former studies carried out in the area. More than 90 specimens were measured from the Sierra Chica locality (37°52′S; 65°27′W) computed in 11 sites (Sc1-Sc11). These rocks are carriers of a characteristic remanence magnetization with reverse polarity, acquired during the Early Permian and assigned to the Kiaman Superchron. The resulting palaeomagnetic pole (PP) is Lat.: 64°S; Long.: 017°E, A95 = 15°, K = 12, N = 10. Others interpretations are also possible if the directions of two sites (SC9 and SC10) are considered to have a different magnetic field record, In that case, the PP calculated for sites Sc1-Sc7 is Lat.: 65°S; Long.: 44°E, A95 = 8°, K = 54, N = 7, and the virtual geomagnetic pole (VGP) calculated for sites Sc9 and Sc10 is Lat.: 48.5°S; Long.: 315°E, A95 = 8°, N = 2. The last possibility to consider Sc9 and Sc10 after structural correction, and the resulting PP position is Lat.: 66.5°S; Long.: 034°E, A95 = 8°, K = 41, N = 9. This deformation episode could be related to the San Rafaelic orogenic phase, found for the first time in La Pampa province, but previously observed in other neighboring areas during Permian time. However, more detailed palaeomagnetic sampling, rock magnetism studies, and age dating are necessary to complete the palaeomagnetic study of this area. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB. Fil:Tomezzoli, R.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v61_n1_p183_Tomezzoli http://hdl.handle.net/20.500.12110/paper_13438832_v61_n1_p183_Tomezzoli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Choiyoi volcanism
Gondwana
Late Paleozoic
Palaeomagnetism
South America
deformation
geomagnetism
Gondwana
magnetic field
magnetic reversal
paleomagnetism
Paleozoic
Permian
remanent magnetization
volcanism
Argentina
La Pampa
South America
spellingShingle Choiyoi volcanism
Gondwana
Late Paleozoic
Palaeomagnetism
South America
deformation
geomagnetism
Gondwana
magnetic field
magnetic reversal
paleomagnetism
Paleozoic
Permian
remanent magnetization
volcanism
Argentina
La Pampa
South America
Tomezzoli, Renata Nela
New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina
topic_facet Choiyoi volcanism
Gondwana
Late Paleozoic
Palaeomagnetism
South America
deformation
geomagnetism
Gondwana
magnetic field
magnetic reversal
paleomagnetism
Paleozoic
Permian
remanent magnetization
volcanism
Argentina
La Pampa
South America
description Preliminary palaeomagnetic results from the Paleozoic volcanic units along the Gondwana margin in Argentina are presented. Even though we are still working on the palaeomagnetic data of the sampled section, these data are consistent with data from former studies carried out in the area. More than 90 specimens were measured from the Sierra Chica locality (37°52′S; 65°27′W) computed in 11 sites (Sc1-Sc11). These rocks are carriers of a characteristic remanence magnetization with reverse polarity, acquired during the Early Permian and assigned to the Kiaman Superchron. The resulting palaeomagnetic pole (PP) is Lat.: 64°S; Long.: 017°E, A95 = 15°, K = 12, N = 10. Others interpretations are also possible if the directions of two sites (SC9 and SC10) are considered to have a different magnetic field record, In that case, the PP calculated for sites Sc1-Sc7 is Lat.: 65°S; Long.: 44°E, A95 = 8°, K = 54, N = 7, and the virtual geomagnetic pole (VGP) calculated for sites Sc9 and Sc10 is Lat.: 48.5°S; Long.: 315°E, A95 = 8°, N = 2. The last possibility to consider Sc9 and Sc10 after structural correction, and the resulting PP position is Lat.: 66.5°S; Long.: 034°E, A95 = 8°, K = 41, N = 9. This deformation episode could be related to the San Rafaelic orogenic phase, found for the first time in La Pampa province, but previously observed in other neighboring areas during Permian time. However, more detailed palaeomagnetic sampling, rock magnetism studies, and age dating are necessary to complete the palaeomagnetic study of this area. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.
author Tomezzoli, Renata Nela
author_facet Tomezzoli, Renata Nela
author_sort Tomezzoli, Renata Nela
title New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina
title_short New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina
title_full New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina
title_fullStr New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina
title_full_unstemmed New palaeomagnetic results from Late Paleozoic volcanic units along the western Gondwana margin in La Pampa, Argentina
title_sort new palaeomagnetic results from late paleozoic volcanic units along the western gondwana margin in la pampa, argentina
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v61_n1_p183_Tomezzoli
http://hdl.handle.net/20.500.12110/paper_13438832_v61_n1_p183_Tomezzoli
work_keys_str_mv AT tomezzolirenatanela newpalaeomagneticresultsfromlatepaleozoicvolcanicunitsalongthewesterngondwanamargininlapampaargentina
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