Publication
Paleomagnetic study of the Messejana Plasencia dyke (Portugal and Spain): A lower Jurassic paleopole for the Iberian plate
| dc.contributor.author | Ortas, A. Palencia | |
| dc.contributor.author | Osete, M. L. | |
| dc.contributor.author | Vegas, R. | |
| dc.contributor.author | Silva, Pedro | |
| dc.date.accessioned | 2012-04-09T12:08:45Z | |
| dc.date.available | 2012-04-09T12:08:45Z | |
| dc.date.issued | 2006-07-07 | |
| dc.description.abstract | The only Iberian lower Jurassic palcomagnetic pole come from the "Central Atlantic Magmatic Province"-related Messejana Plasencia dyke, but the age and origin of its remanence have been a matter of discussion. With the aim of solving this uncertainty, and to go further into a better understanding of its emplacement and other possible tectonic features, a systematic paleomagnetic investigation of 40 sites (625 specimens) distributed all along the 530 kin of the Messejana Plasencia dyke has been carried out. Rock magnetic experiments indicate PSD low Ti-titanomagnetite and magnetite as the minerals carrying the NRM. The samples were mostly thermally demagnetized. 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 a total of 35 valid sites is representative of the whole structure of the dyke, and statistically well defined, with values of PLa = 70.4 degrees N, PLo = 237.6 degrees E, K= 47.9 and A(95) = 3.5 degrees. Paleomagnetic data indicates that: (i) there is no evidence of a Cretaceous remagnetization in the dyke, as it was suggested; (ii) most of the dyke had a brief emplacement time; furthermore, two dyke intrusion events separated in time from it by at least 10,000 y have been detected; (iii) the high grouping of the VGPs directions suggests no important tectonic perturbations of the whole structure of the dyke since its intrusion time; (iv) the pole derived from this study is a good quality lower Jurassic paleopole for the Iberian plate; and (v) the Messejana Plasencia dyke paleopole for the Iberian plate is also in agreement with quality-selected European and North American lower Jurassic paleopoles and the magnetic anomalies data sets that are available for rotate them to Iberia. | por |
| dc.identifier.citation | ORTAS, A. P.; [et al] – Paleomagnetic study of the Messejana Plasencia dyke (Portugal and Spain): A lower Jurassic paleopole for the Iberian plate. Tectonophysics. ISSN 0040-1951. Vol. 420; N.º 3-4 (2006), pp. 455-472. | por |
| dc.identifier.doi | 10.1016/j.tecto.2006.04.003 | |
| dc.identifier.issn | 0040-1951 | |
| dc.identifier.uri | http://hdl.handle.net/10400.21/1390 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | Elsevier Science | por |
| dc.subject | Paleomagnetism | por |
| dc.subject | CAMP | por |
| dc.subject | Dyke | por |
| dc.subject | Iberia | por |
| dc.subject | Jurassic | por |
| dc.title | Paleomagnetic study of the Messejana Plasencia dyke (Portugal and Spain): A lower Jurassic paleopole for the Iberian plate | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Netherlands | por |
| oaire.citation.endPage | 472 | por |
| oaire.citation.issue | 3-4 | por |
| oaire.citation.startPage | 455 | por |
| oaire.citation.title | Tectonophysics | por |
| oaire.citation.volume | 420 | |
| person.familyName | Silva | |
| person.givenName | Pedro | |
| person.identifier | 1232178 | |
| person.identifier.ciencia-id | C314-1157-FD0C | |
| person.identifier.orcid | 0000-0002-9178-3623 | |
| person.identifier.rid | B-8512-2008 | |
| person.identifier.scopus-author-id | 55431034700 | |
| rcaap.rights | restrictedAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | 54c96e27-8c3a-42d9-b751-ebc637c2f478 | |
| relation.isAuthorOfPublication.latestForDiscovery | 54c96e27-8c3a-42d9-b751-ebc637c2f478 |