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تفاصيل البطاقة الفهرسية

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Le complexe annulaire d'age Oligocene de l'Achkal (hoggar Central, Sud Algerie)

temoin de la transition au CenozoIque entre les magmatismes tholeitique et alcalin. Evidences par les isotopes du Sr, Nd et Pb

مقال من تأليف: Maza, Mustapha ; Dautria, Jean-Marie ; Briqueu, Louis ; Bosch, Delphine ;

ملخص: The Achkal Oligocene ring complex cross-cuts the Upper Eocene tholeiitic traps located on the top of the Hoggar swell. The plutonic rocks range from tholeiitic gabbros to alkali essexites, monzonites and syenites, whereas the volcanites are restricted to late peralkaline rhyolites. The affinity change linked to the large isotopic heterogeneities (from EM1 to HIMU) suggests that the parental magmas are issued from two distinct mantle sources, first lithospheric then deeper. The Achkal has recorded the magmatic evolution of the Hoggar hot spot, between Eocene and Miocene.


لغة: فرنسية