Interrelations between extensional shear zones and synkinematic intrusions: The example of Ikaria Island (NE Cyclades, Greece)

Valentin Laurent (1) , Alexandre Beaudoin (1) , Laurent Jolivet (1) , Laurent Arbaret (1) , Romain Augier (1) , Aurélien Rabillard (1) , Armel Menant (1)

1 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327

The Aegean extensional backarc domain is an ideal place to investigate the interrelations between syntectonic intrusions and large-scale detachments, understanding whether the intrusions have a triggering effect on the inception of metamorphic core complex formation or not. A new field study of Ikaria Island (NE Cyclades, Greece) in two Miocene granitoid plutons intruding a high-temperature metamorphic dome, namely the Raches and Karkinagrion granites, leads to the identification of a major structure that has been omitted in previous studies: the Gialiskari Detachment. This regional-scale detachment is correlated with the North Cycladic Detachment System. Structural fieldwork at the scale of the entire Raches and Karkinagrion intrusions allows us to propose a map of strain intensity in these granites.

Mots clés: Ikaria Island; Aegean; Backarc extension; intrusions; metamorphic core complexes; detachment

Domaines: Planète et Univers [physics]; Sciences de la Terre; Tectonique

Valentin Laurent, Alexandre Beaudoin, Laurent Jolivet, Laurent Arbaret, Romain Augier, et al.. Interrelations between extensional shear zones and synkinematic intrusions: The example of Ikaria Island (NE Cyclades, Greece). Tectonophysics, 2015, 651-652, pp.152-171. ⟨10.1016/j.tecto.2015.03.020⟩. ⟨insu-01145425⟩