GEOLOGICA BALCANICA, 38. 1—3, Sofia, Dec. 2009, p. 23—33. Morphotectonic characteristics of Lefkas Island during the Quaternary (Ionian Sea, Greece) George D. Bathrellos1, Varvara E. Antoniou2, Hariklia D. Skilodimou1 1 Department of Geography & Climatology, Faculty of Geology & Geoenvironment, National & Kapodistrian University of Athens, University Campus (Panepistimiopolis), Zografou, ZC 15784, Athens, Greece; e-mails:
[email protected];
[email protected] 2 Department of Dynamic-Tectonic-Applied Geology, Faculty of Geology & Geoenvironment, National & Kapodistrian University of Athens, University Campus (Panepistimiopolis), Zografou, ZC 15784, Athens, Greece; e-mail:
[email protected] (Submitted: 13.03.2008; accepted in revised form: 13.05.2009) Abstract. This paper focuses on the study of the Quaternary morphotectonic evolution of the Lefkas Island using morphological and tectonic data. Based on our mainly morphological stud- ies, two principal tectonic structures have been distinguished: (i) the Nydri-Vasiliki Fault Zone (NVF) and (ii) the Ionian Zone overthrust onto the Paxos Zone, which both divide the island into three morphotectonic units of Karya (KMTU), Maradochori (MMTU) and Athani (AMTU). Paleogeographically, it has been suggested that the broader Lefkas area was dominated by a NE—SW to ENE—WSW compressional regime since the early Pliocene that continuous in our days, resulting in the uplift of the southwestern part of the island and the submergence of the northeastern part of the island. This deformation is characterized by principal fault structures of a N110°—130° strike. These structures, combined with a fault system of N40°—60° strike repre- senting an older Miocene fault zone, control the main morphological characteristics such as watersheds and streams and are responsible for the KMTU formation producing a northeast- ward plunging monoclinal en-echelon structure.