Geochronology, geochemistry and isotope systematics of a mafic-intermediate dyke complex in the Istanbul Zone. New constraints on the evolution of the Black Sea in NW Turkey

Aysal N., Keskin M., Peytcheva I., Duru O.

Conference on Petroleum Geology of the Black Sea, London, Canada, 6 - 07 October 2015, vol.464, pp.131-168 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 464
  • Doi Number: 10.1144/sp464.4
  • City: London
  • Country: Canada
  • Page Numbers: pp.131-168
  • Istanbul University Affiliated: Yes

Abstract

We report new U-Pb zircon ages, major and trace element data, mineral chemistry, and Sr-Nd isotopic analyses of the mafic-intermediate dykes and intrusions in the Istanbul Zone. Mafic dykes are represented by calc-alkaline to alkaline lamprophyre and diabase. Intermediate dykes and subvolcanics are andesitic to dacitic in composition and calc-alkaline in character, while intrusive rocks (stocks and small plutons) are granodioritic and dioritic in composition. New zircon U-Pb laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) dating yielded ages from 72.49 +/- 0.79 (Upper Cretaceous-Campanian) to 65.44 +/- 0.93 Ma (Lower Paleocene-Danian) for the intermediate dykes, and 58.9 +/- 1.8 Ma (Upper Paleocene-Thanetian) for a small granodiorite stock. Sr-87/Sr-86(i) values of the mafic and intermediate dykes and small stocks span a range from 0.703508 to 0.706311, while their Nd-143/Nd-144(i) values vary from 0.512614 to 0.512812 and eNd((i)) values from 5.09 to 1.24. Nd-TDM model ages range between 0.46 and 0.77 Ga.