New Insights on the Neogene Tectonic Evolution of the Aksu Basin (Se Turkey) From the Anisotropy of Magnetic Susceptibility (Ams) and Paleostress Data

Abstract

The junction between the Aegean and Cyprus arc in the southern Turkey forms a triangular-shaped morphological structure so-called Isparta Angle (IA). In Neogene time, the inner part of the Isparta Angle became overlain by sedimentary basins including Manavgat, Koprucay and Aksu, characterized by marine clastics and carbonates. Aksu Basin, one of these marine basins, provides geological records about the Neogene crustal deformation and stress field in the Eastern Mediterranean region. Therefore, we kinematically assess if and when tectonic stress fields affected the Aksu basin in early Miocene to recent times. For this purpose, Anisotropy of Magnetic Susceptibility (AMS) data (AMS) of cored samples and fault-slip data from the brittle mesoscopic faults were collected. The similar to 490 oriented samples for Anisotropy of Magnetic Susceptibility measurements were analyzed and two different maximum magnetic lineation's directions are recognized; 1) N-S magnetic lineation in Pliocene and 2) from N-S to NW-SE magnetic lineation in the Miocene. The results inferred from more than 1000 fault-slip data collected from 83 different sites combined with AMS results demonstrate that the Aksu Basin developed under four different tectonic phases; 1) similar to E-W extensional phase (related to basin formation), 2) similar to N-S compressional (Lycian) phase, 3) similar to(N)E-(S)W compressional (Aksu) phase and 4) N-S extensional (Recent) phase.