Estudio paleomagnético del dique de Messejana-Plasencia


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Palencia Ortas, Alicia and Osete López, María Luisa and Maceira, M. and Villalaín Santamaría, Juan José and Vegas, Ramón (2004) Estudio paleomagnético del dique de Messejana-Plasencia. Geotemas, 6 (4). pp. 316-318. ISSN 1576-5172

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A paleomagnetic investigation of 39 sites (591 samples) across the 530 km ot the Messejana-Plasenciadike has been carried out. Rock magnetic experiments indicate PSD low Ti titanomagnetite and magnetite as the minerals carrying the NRM. The samples where mostly demagnetised by thermal demagnetisation. Most sites exhibit a characteristic remanent component of normal polarity 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 ot Plat=70.5, Plong=238.0, K= 47.8 and ags=3.5. Paleomagnetic data indicates: (i) the dike had a brief emplacement time, (ii) the age of intrusion can be constrained between 180-200 Ma, (Hi) the high grouping of the VGPs directions suggest no important tectonic perturbations of the whole structure of the dike since its intrusion to the present.

Item Type:Article
Uncontrolled Keywords:Paleomagnetism, Messejana-Plasencia, Dike, Iberian Plate, Jurassic
Subjects:Sciences > Geology > Geodynamics
ID Code:60893
Deposited On:12 Jun 2020 12:09
Last Modified:12 Jun 2020 12:09

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