The north cycladic detachment system and associated mineralization, Mykonos, Greece: Insights on the evolution of the Aegean domainReport as inadecuate




The north cycladic detachment system and associated mineralization, Mykonos, Greece: Insights on the evolution of the Aegean domain - Download this document for free, or read online. Document in PDF available to download.

1 BRGM - Bureau de Recherches Géologiques et Minières 2 ISTO - Institut des Sciences de la Terre d-Orléans - UMR7327 3 Faculty of Geology & Geoenvironment

Abstract : In the Aegean back-arc domain, some 30-35 Ma ago, an increase of the rate of slab retreat led to the initiation of post-orogenic extension, largely accommodated by large-scale structures such as the North Cycladic Detachment System NCDS. Although this extension is still active nowadays, an E-W compressional regime developed in the Late Miocene with the propagation of the North Anatolian Fault. On Mykonos island Cyclades, the NE-SW back-arc extension is particularly well expressed with the Livada and Mykonos detachments that belong to the NCDS and that are associated with NW-SE barite veins emplaced during the synkinematic cooling of the Mykonos intrusion. This study shows that the formation of the mineralization occurred when the pluton crossed the ductile-to-brittle transition during its exhumation below the NCDS at ~11-10 Ma. In addition, the kinematics of mineralized structures evolved with time: 1 most of the displacement was accommodated by the top-to-the-NE Livada and Mykonos detachments accompanied by the formation of mineralized normal faults that were 2 reworked in a strike-slip regime with an E-W direction of shortening and a persistent NE-SW stretching and 3 a latepost-mineralization E-W compressional stage with a minor reworking of shallow-dipping faults locally including the detachments themselves. We interpret this increase of the E-W shortening component recorded during the mineraldeposition as a consequence of the initiation of the westward motion of Anatolia from 10 Ma, thus 4 Ma before the propagation of the North Anatolian Fault in the Dardanelles Strait and the localization of the strain on the Aegean Sea margins.

Keywords : North Cycladic Detachment System Mykonos island Barite veins North Anatolian Fault





Author: Armel Menant - Laurent Jolivet - Romain Augier - Nikolaos Skarpelis -

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents