Datación paleomagnética de la parte sur del dique de Messejana- Plasencia



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Palencia Ortas, Alicia and Osete López, María Luisa and Vegas Martínez, Ramón and Villasante Marcos, Víctor and Silva, Pedro F. and Fonseca, P.E. and Miranda Pantoja, José Miguel (2000) Datación paleomagnética de la parte sur del dique de Messejana- Plasencia. Geotemas, 1 (1). pp. 121-123. ISSN 1576-5172

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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.

Item Type:Article
Uncontrolled Keywords:Paleomagnetism, Messejana-Plasencia, Dike, Iberian Plate, Jurassic
Subjects:Sciences > Geology > Geodynamics
ID Code:61426
Deposited On:09 Jul 2020 10:29
Last Modified:09 Jul 2020 10:29

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