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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.


Documento: Artículo
Título:Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina
Autor:Mena, M.; Orgeira, M.J.; Lagorio, S.
Filiación:CONICET-INGEODAV, Argentina
Dto. Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Palabras clave: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
Página de inicio:1283
Página de fin:1293
Título revista:Earth, Planets and Space
Título revista abreviado:Earth Planets Space


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---------- APA ----------
Mena, M., Orgeira, M.J. & Lagorio, S. (2006) . Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina. Earth, Planets and Space, 58(10), 1283-1293.
---------- CHICAGO ----------
Mena, M., Orgeira, M.J., Lagorio, S. "Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina" . Earth, Planets and Space 58, no. 10 (2006) : 1283-1293.
---------- MLA ----------
Mena, M., Orgeira, M.J., Lagorio, S. "Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina" . Earth, Planets and Space, vol. 58, no. 10, 2006, pp. 1283-1293.
---------- VANCOUVER ----------
Mena, M., Orgeira, M.J., Lagorio, S. Paleomagnetism, rock-magnetism and geochemical aspects of early Cretaceous basalts of the Paraná Magmatic Province, Misiones, Argentina. Earth Planets Space. 2006;58(10):1283-1293.