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Evaluación de las discrepancias entre Polos Paleomagnéticos de Iberia y la Curva de Deriva Polar Aparente Global de Placas Tectónicas

Authors: Rodríguez-Molina, Sara; Ruiz-Martínez, V. C.;

Evaluación de las discrepancias entre Polos Paleomagnéticos de Iberia y la Curva de Deriva Polar Aparente Global de Placas Tectónicas

Abstract

[ES] Numerosos factores dificultan un entendimiento consensuado sobre la evolución de Iberia en el marco de la cinemática global de placas. Su localización ocupa una posición estratégica en el puzle paleogeográfico, especialmente durante la apertura del océano Atlántico y la bahía de Vizcaya. Muchos de los trabajos paleomagnéticos realizados en Iberia se han concentrado en precisar el periodo, modo y cuantía de su rotación respecto a Europa. En este estudio se recopilan los polos paleomagnéticos de Iberia existentes (desde el Pérmico hasta el Mioceno) en la literatura y se evalúa críticamente su fiabilidad. Asimismo, se ha utilizado software libre de dinámica litosférica y mantélica (GMAP, GPlates), para (i) construir mediante diferentes técnicas “Curvas de Deriva Polar Aparente” de la placa Ibérica; y (ii) analizar la reconstrucción de la cinemática de Iberia, a partir tanto de la recopilación de polos paleomagnéticos realizada, como de dos distintos modelos actuales de circuitos de placas. Los resultados muestran la necesidad de obtener nuevos polos paleomagnéticos de calidad y de re-examinar los datos paleomagnéticos disponibles para la placa Ibérica (atendiendo principalmente a la identificación de remagnetizaciones, la calidad de las dataciones radiométricas, la estadística de las direcciones y diferentes tests de garantía de una señal paleomagnética primaria, y la aplicación de correcciones del aplanamiento de la inclinación en rocas sedimentarias), en especial para el periodo anterior al Triásico Superior y el comprendido entre 160-125 Ma.

[EN] Many factors prevent a consensual understanding of the evolution of Iberia in a global plate kinematics framework. Iberia is strategically located within the paleogeographic puzzle, especially during the opening of the Atlantic Ocean and the Bay of Biscay. Many paleomagnetic studies have been performed in outcrops from Iberia with the attempt to specify the period, style and amount of their rotation with respect to Europe. In this study, available Iberian poles (from Permian to Miocene times) are collected from the paleomagnetic literature, and their reliability is critically evaluated. In addition, free software (GMAP, GPlates) of lithospheric and mantle dynamics modelling is used to: (i) create "Apparent Polar Wander Paths" (APWPs) for the Iberian plate through different construction methods; and (ii) analyze Iberian plate kinematics by means of the compilation of Iberian paleomagnetic poles and from two current, distinct plate-circuits models. Results highlight the need to obtain new paleomagnetic poles for the Iberian plate and to reexamine already published paleomagnetic data (regarding different issues as identification of remagnetizations, uncertainties of radiometric datings, statistical cut-offs, quality tests for the primary magnetizations, corrections of the paleomagnetic directions from sedimentary rocks attending to their inclination shallowing, ...) specially in the period before Late Triassic and between 160 and 125 Ma.

Trabajo presentado en el 9ª Asamblea Hispano Portuguesa de Geodesia y Geofísica, celebrada en Madrid (España), del 28 al 30 de junio de 2016

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
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