Publikationsdatum:
2007
Beschreibung:
〈b〉Syn- and post-orogenic exhumation of metamorphic rocks in North Aegean〈/b〉〈br〉
R. Lacassin, N. Arnaud, P. H. Leloup, R. Armijo, and B. Meyer〈br〉
eEarth, 2, 51-63, doi:10.5194/ee-2-51-2007, 2007〈br〉
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). Structural 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 normal faulting with northeastward transport, is coeval with
orogenic shortening in the close area. Cooling rates, and likely exhumation,
have been low between ~40 Ma and ~20 Ma. 〈sup〉40〈/sup〉Ar/〈sup〉39〈/sup〉Ar
crystallization ages (between 20 and 15 Ma) appears related to
brittle-ductile normal faulting and likely associated with Neogene Aegean
back-arc extension. The dating 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.
Print ISSN:
1815-3836
Digitale ISSN:
1815-3844
Thema:
Geologie und Paläontologie
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