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Título:
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Datación paleomagnética de la parte sur del dique de Messejana-Plasencia
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Autores:
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Palencia Ortas, Alicia ;
Osete López, María Luisa ;
Vegas Martínez, Ramón ;
Villasante Marcos, Víctor ;
Silva, Pedro F. ;
Fonseca, P.E. ;
Miranda Pantoja, José Miguel
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Tipo de documento:
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texto impreso
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Editorial:
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Sociedad Geológica de España., 2000
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología: Geodinámica
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Tipo = Artículo
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Resumen:
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A Paleomagnetic investigation of 11 sites across the southern part of Messejana-Plasencia dike has been carried out. The magnetic behaviour o f pilot samples indicates that thermal demagnetisation is more effective than alternating field cleaning (AF) in isolating the Characteristic Remanent Magnetisation (ChRM). Therefore thermal demagnetisation was systematically used with the remaining samples. The ChRM is well grouped. Most sites exhibit normal polarities with the exception of two sites, where samples with reversed polarities have been observed. The paleomagnetic pole derived from the sites is well defined, with values of Plat=72.5, Plong=243.7 and Al);=6.0. This coincides with the pole calculated in a previous investigation (Schott et at. 1981) o f the dike. It is also in agreement with Toarcian poles from the Iberian Range (Osete et al. 2000) and statistically different from the Oxfordian Pole obtained in the same region. Previous radiometric studies suggested that the age o f dike intrusion is 160-200Ma. Paleomagnetic data indicates that the age o f intrusion can be constrained between 180-200Ma.
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En línea:
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https://eprints.ucm.es/id/eprint/61426/1/P%C3%A1ginas%20desdeGeotemas1_1-5.pdf
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