Remagnetización regional en sedimentos Jurásicos del Alto Atlas Marroquí
- S. Torres 1
- J.J. Villalaín 1
- A. Casas 2
- H. El Ouardi 3
- B. Moussaid 3
- V.C. Ruíz Martínez 4
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1
Universidad de Burgos
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2
Universidad de Zaragoza
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- 3 Université Moulay Ismail
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4
Universidad Complutense de Madrid
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ISSN: 1576-5172
Year of publication: 2012
Issue Title: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Issue: 13
Pages: 1192-1195
Type: Article
More publications in: Geotemas (Madrid)
Abstract
This work shows the results obtained from a paleomagnetic study performed in syn-rift sedimentary rocks of strongly subsiding basins of the High Atlas, Morocco. The data from 50 sites (500 samples) corresponding to limestones and marly limestones Early to Middle Jurassic in age show that these rocks underwent a regional remagnetization. All samples present a single stable paleomagnetic component that sistematically shows normal polarity. Several fold tests in different structures indicate that the remagnetization is pre-folding in the small scale compressive folds, but it shows a pre-post-and syn-tectonic acquisition in other structures. Using the small circle intersection method we have calculated the Earth magnetic field direction at the remagnetization acquisition time. The comparison of the direction of this component with expected directions obtained from the apparent polar wander curve of Africa indicates that it was acquired at the end of the Early Cretaceous. The analysis of the direction of the remagnetization will provide the restored geometry of the basin in the acquisition remagnetization time, allowing to date particular structures.
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