THE AYLI DAG OPHIOLITE SEQUENCE (CENTRAL-NORTHERN TURKEY): A FRAGMENT OF MIDDLE JURASSIC OCEANIC LITHOSPHERE WITHIN THE INTRA-PONTIDE SUTURE ZONE


GÖNCÜOĞLU M. C., Marroni M., Sayit K., TEKİN U. K., Ottria G., Pandolfi L., ...More

OFIOLITI, vol.37, no.2, pp.77-92, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 37 Issue: 2
  • Publication Date: 2012
  • Doi Number: 10.4454/ofioliti.v37i2.407
  • Journal Name: OFIOLITI
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.77-92
  • Keywords: Ophiolites, geochemistry, Radiolaria, back-arc basin, Intra-Pontide suture zone, Turkey, BACK-ARC BASIN, TECTONIC EVOLUTION, MAGMA GENESIS, NORTHWESTERN ANATOLIA, TRIASSIC EVOLUTION, GREECE IMPLICATION, ARMUTLU PENINSULA, MARIANA TROUGH, MORB MANTLE, ISLAND-ARC
  • Middle East Technical University Affiliated: Yes

Abstract

The Ayli Dag ophiolites occur as an independent tectonic unit within the Intra-Pontide suture zone, central-northern Turkey. They crop out, together with the other units of the Intra-Pontide suture zone, at the top of the Late Cretaceous-Middle Paleocene foredeep sediments of the Sakarya Terrane. The Ayli Dag ophiolites sequence include in its lower part a mantle sequence consisting of not less than 2-3 km-thick peridotites, topped by 500-600 m-thick layered gabbros with alternating, dm- to m-thick layers of spinet-bearing dunites, melatroctolites, troctolites, ol-gabbros and leucogabbros. The gabbro sequence is over-lain by a sheeted dyke complex, that shows a transition to 100-200 m-thick massive basaltic lava flows followed by 600-800 m-thick massive and pillow lavas and breccias alternating with ophiolite-bearing arenites and cherts.