Cenozoic Eurasia is not a single rigid plate: Paleomagnetic evidence - 13/02/14
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Abstract |
The widely distributed Cenozoic paleomagnetic inclination anomaly in Asia is usually attributed to either a widespread error of magnetic field recording due to an inclination flattening mechanism in sediments, or to the persistence of an anomalous non-dipolar component of the geomagnetic field throughout the Tertiary. Based on an analysis of the Asian paleomagnetic database for Meso-Cenozoic times, we suggest that instead this puzzling anomaly results from an overlooked global plate tectonics cause where the wide so-called Eurasian plate would have suffered from previously undetected transpressive north–south relative movements between its western and eastern ends since the Cretaceous. These relative movements are most probably accommodated by a component of right-lateral shear movement distributed in the Tornquist–Tesseyre zone, and a localized left-lateral shear movement in the Ural Mountain chain during the Tertiary. Therefore, Eurasia was not the single rigid plate that Cenozoic plate reconstructions have accepted.
Le texte complet de cet article est disponible en PDF.Keywords : Plate tectonics, Palaeomagnetism, Cenozoic inclination anomaly, Eurasia plate
Plan
Vol 345 - N° 11-12
P. 419-426 - novembre 2013 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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