Syn- and post-orogenic exhumation of metamorphic rocks in North Aegean

The Olympos-Ossa-Pelion (OOP) ranges, in NW Aegean, encompass Greece highest summit and are located near the extremity of the North Anatolian Fault (NAF). Struc- tural and thermochronological data gathered in the OOP ranges show that the main exhumation of metamorphic nappes occurred in the Eocene, at ca. 43-39 Ma. This early exhumation, associated with ductile, then brittle-ductile nor- mal faulting with northeastward transport, is coeval with oro- genic shortening in the close area. Cooling rates, and likely exhumation, have been low between ∼40 Ma and ∼20 Ma. 40 Ar/ 39 Ar crystallization ages (between 20 and 15 Ma) ap- pears related to brittle-ductile normal faulting and likely as- sociated with Neogene Aegean back-arc extension. The dat- ing of a diabase dyke, and the geometry of associated brittle jointing, of onshore and offshore active normal faults suggest a shift in extension direction after 4Ma, possibly in relation with the propagation of the NAF in northern Aegean.

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