Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina

The basalts of the Posadas Formation were extruded during the huge continental volcanism that affected the Parana Basin in the Lower Cretaceous. We have carried out a paleomagnetic and rock-magnetic study on samples collected along a basalt outcrop section in Misiones, Argentina and determined that...

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Detalles Bibliográficos
Autores principales: Mena, Mabel, Orgeira, María Julia, Lagorio, Silvia Leonor
Publicado: 2006
Materias:
basalts
Cretaceous
Paleomagnetism
Paranv Magmatic Province
rock-magnetism
basalt
geochemistry
geomagnetic field
outcrop
paleomagnetism
remanent magnetization
rock property
volcanism
Argentina
Misiones [Argentina]
Parana Basin
South America
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v58_n10_p1283_Mena
http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1283_Mena
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_13438832_v58_n10_p1283_Mena
record_format dspace
spelling paper:paper_13438832_v58_n10_p1283_Mena2023-06-08T16:10:42Z Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina Mena, Mabel Orgeira, María Julia Lagorio, Silvia Leonor basalts Cretaceous Paleomagnetism Paranv Magmatic Province rock-magnetism basalt Cretaceous geochemistry geomagnetic field outcrop paleomagnetism remanent magnetization rock property volcanism Argentina Misiones [Argentina] Parana Basin South America The basalts of the Posadas Formation were extruded during the huge continental volcanism that affected the Parana Basin in the Lower Cretaceous. We have carried out a paleomagnetic and rock-magnetic study on samples collected along a basalt outcrop section in Misiones, Argentina and determined that rocks classified as tholeiitic basalts and andesi-basalts are characterized by a low to intermediate content of Ti. Paleomagnetic and rock-magnetic studies suggest that the main magnetic mineral is low-Ti titanomagnetite of superparamagnetic (SP) to single-domain (SD) sizes, and very low amounts of multi-domain (MD) particles. The stable magnetic remanence enabled us to define characteristic remanent magnetizations (ChRMs) with a maximum angular deviation (MAD)>5 ° in most cases; and in all the cases, a MAD>10 °. The sequence has registered at least two polarity reversions, starting from a normal polarity at the base. The calculated virtual geomagnetic poles (VGPs) present an elongated distribution similar to other distributions of VGPs published for the Parana Magmatic Province. The elongated distribution of the VGPs could be a real feature of the geomagnetic field at a time of frequent changes of polarity. © 2006, The Seismological Society of Japan, Society of Geomagnetism and Earth, Planetary and Space Sciences, The Volcanological Society of Japan, The Geodetic Society of Japan, The Japanese Society for Planetary Sciences. All rights reserved. Fil:Mena, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lagorio, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v58_n10_p1283_Mena http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1283_Mena
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic basalts
Cretaceous
Paleomagnetism
Paranv Magmatic Province
rock-magnetism
basalt
Cretaceous
geochemistry
geomagnetic field
outcrop
paleomagnetism
remanent magnetization
rock property
volcanism
Argentina
Misiones [Argentina]
Parana Basin
South America
spellingShingle basalts
Cretaceous
Paleomagnetism
Paranv Magmatic Province
rock-magnetism
basalt
Cretaceous
geochemistry
geomagnetic field
outcrop
paleomagnetism
remanent magnetization
rock property
volcanism
Argentina
Misiones [Argentina]
Parana Basin
South America
Mena, Mabel
Orgeira, María Julia
Lagorio, Silvia Leonor
Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
topic_facet basalts
Cretaceous
Paleomagnetism
Paranv Magmatic Province
rock-magnetism
basalt
Cretaceous
geochemistry
geomagnetic field
outcrop
paleomagnetism
remanent magnetization
rock property
volcanism
Argentina
Misiones [Argentina]
Parana Basin
South America
description The basalts of the Posadas Formation were extruded during the huge continental volcanism that affected the Parana Basin in the Lower Cretaceous. We have carried out a paleomagnetic and rock-magnetic study on samples collected along a basalt outcrop section in Misiones, Argentina and determined that rocks classified as tholeiitic basalts and andesi-basalts are characterized by a low to intermediate content of Ti. Paleomagnetic and rock-magnetic studies suggest that the main magnetic mineral is low-Ti titanomagnetite of superparamagnetic (SP) to single-domain (SD) sizes, and very low amounts of multi-domain (MD) particles. The stable magnetic remanence enabled us to define characteristic remanent magnetizations (ChRMs) with a maximum angular deviation (MAD)>5 ° in most cases; and in all the cases, a MAD>10 °. The sequence has registered at least two polarity reversions, starting from a normal polarity at the base. The calculated virtual geomagnetic poles (VGPs) present an elongated distribution similar to other distributions of VGPs published for the Parana Magmatic Province. The elongated distribution of the VGPs could be a real feature of the geomagnetic field at a time of frequent changes of polarity. © 2006, The Seismological Society of Japan, Society of Geomagnetism and Earth, Planetary and Space Sciences, The Volcanological Society of Japan, The Geodetic Society of Japan, The Japanese Society for Planetary Sciences. All rights reserved.
author Mena, Mabel
Orgeira, María Julia
Lagorio, Silvia Leonor
author_facet Mena, Mabel
Orgeira, María Julia
Lagorio, Silvia Leonor
author_sort Mena, Mabel
title Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
title_short Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
title_full Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
title_fullStr Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
title_full_unstemmed Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
title_sort paleomagnetism, rock-magnetism and geochemical aspects of early cretaceous basalts of the paraná magmatic province, misiones, argentina
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v58_n10_p1283_Mena
http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1283_Mena
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AT orgeiramariajulia paleomagnetismrockmagnetismandgeochemicalaspectsofearlycretaceousbasaltsoftheparanamagmaticprovincemisionesargentina
AT lagoriosilvialeonor paleomagnetismrockmagnetismandgeochemicalaspectsofearlycretaceousbasaltsoftheparanamagmaticprovincemisionesargentina
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