We propose a geodynamic model for the Mediterranean area that put in mantle expansion growing eastward, above a relatively cold, chemical plume trapped in the Transition Zone (410-670 km) after that core/mantle perturbations released H, C, N, K, S long trapped within the D??? layer. Lithosphere above the expanded asthenosphere undergone stretching and thinning and subordinate peripheral compression. Low-degree melting of the metasomatised asthenosphere produced ultra-alkaline magmas with a distinctive radiogenicity derived by the long term Rb/87Sr and U/Th decay leading to a unique isotopic end-member (ITEM, i.e. Italian Enriched Mantle).
Mantle Expansion Driving Lithosphere Tectonics: The Mediterranean Case
LAVECCHIA, Giuseppina;STOPPA, Francesco
2013-01-01
Abstract
We propose a geodynamic model for the Mediterranean area that put in mantle expansion growing eastward, above a relatively cold, chemical plume trapped in the Transition Zone (410-670 km) after that core/mantle perturbations released H, C, N, K, S long trapped within the D??? layer. Lithosphere above the expanded asthenosphere undergone stretching and thinning and subordinate peripheral compression. Low-degree melting of the metasomatised asthenosphere produced ultra-alkaline magmas with a distinctive radiogenicity derived by the long term Rb/87Sr and U/Th decay leading to a unique isotopic end-member (ITEM, i.e. Italian Enriched Mantle).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
