Cenozoic to Cretaceous paleomagnetic dataset from Egypt: New data, review and global analysis
Résumé
7 Different phases of igneous activity took place in Egypt during the Mesozoic and the 8 Cenozoic and oriented samples were collected from three Cenozoic localities (Baharya oasis 9 in the Western Desert, Abu Had in the Eastern Desert and Quseir along the Red Sea coast), 10 and four Cretaceous localities (Toshki & Abu Simbel south of Aswan, and Shalaten & Abu 11 Shihat along the Red Sea coast). Rock magnetic properties of the samples indicate magnetite 12 and titanomagnetite as the main carrier of the remanent magnetization. Following stepwise 13 demagnetization, characteristic remanent directions were identified only for 85% of the 14 samples, a fairly low rate for that type of samples. Cretaceous to Miocene paleomagnetic 15 results that have been published largely overlap, blurring the Apparent Polar Wander Path for 16 Egypt. A new analysis at the site level was carried out and new pole positions were calculated 17 by area and by period. Even though the new analysis drastically reduced the number of 18 considered poles for Egypt, it allows definition of a fairly reliable apparent polar wander path 19 for the Cenozoic of Egypt that differs from the South African Master Polar Wander Path by 20 about 10°. For the Cretaceous, igneous poles are in good agreement with the rest of the 21 African data but not the sedimentary poles that form two groups, one in agreement with the 22 South African Master Polar Wander Path, and the other in agreement with our new Apparent 23 Polar Wander Path for Egypt. This indicates that the displacement highlighted by the 24 Cenozoic poles, similar to the one seen in the Afar rift, mainly affected the Cairo-Suez area. 25 2
Domaines
Géophysique [physics.geo-ph]
Origine : Fichiers produits par l'(les) auteur(s)
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