Sobre la extensión de la remagnetización cretácica en el Alto Atlas (Marruecos)
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Abstract
En este trabajo se presentan los resultados preliminares de un estudio
paleomagnético, en sedimentos mesozoicos del corte Midelt-Errachidia en
el Alto Atlas marroquí. La magnetización remanente natural está dominada
por una remagnetización que presenta un comportamiento muy estable con
polaridad normal. Utilizando el método de intersección de círculos menores
hemos calculado la dirección de la magnetización secundaria (D = 336,7°,
I = 30,6°). La comparación de la dirección característica de la remagnetización
con la curva de deriva polar aparente global (GAPWP) en coordenadas
africanas para el norte de Africa, ha permitido asignar una edad Cenomaniense
a la remagnetización (~100 M.a.), similar a la obtenida en otras
regiones del Alto Atlas Central. Este trabajo refuerza la hipótesis de que
existe una remagnetización generalizada en el Alto Atlas marroquí
We present the preliminary results of a paleomagnetic study, in Mesozoic sediments of the Midelt-Errachidia transect in the Moroccan High Atlas. The Natural Remanent Magnetization is dominated by a remagnetization with a very stable behavior and systematic normal polarity, previously observed in a westward region of the Central High Atlas. Using the small circle intersection method we have calculated the direction of this secondary magnetization (D = 336.7°, I = 30.6°). Comparing this direction with the Global Apparent Polar Wander Path (APWP) in African coordinates for Northern Africa we can assign a Cenomanian age (about 100 M.a.) to this remagnetization, similar to that obtained in other regions of the Central High Atlas. This work enhances the hypothesis that there is a widespread remagnetization in the Moroccan High Atlas
We present the preliminary results of a paleomagnetic study, in Mesozoic sediments of the Midelt-Errachidia transect in the Moroccan High Atlas. The Natural Remanent Magnetization is dominated by a remagnetization with a very stable behavior and systematic normal polarity, previously observed in a westward region of the Central High Atlas. Using the small circle intersection method we have calculated the direction of this secondary magnetization (D = 336.7°, I = 30.6°). Comparing this direction with the Global Apparent Polar Wander Path (APWP) in African coordinates for Northern Africa we can assign a Cenomanian age (about 100 M.a.) to this remagnetization, similar to that obtained in other regions of the Central High Atlas. This work enhances the hypothesis that there is a widespread remagnetization in the Moroccan High Atlas







