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U–Pb and Sm–Nd geochronology of the Kızıldağ (Hatay, Turkey) ophiolite: implications for the timing and duration of suprasubduction zone type oceanic crust formation in the southern Neotethys

Published online by Cambridge University Press:  23 October 2012

FATIH KARAOĞLAN ,
OSMAN PARLAK ,
URS KLÖTZLI ,
MARTIN THÖNI  and
FRIEDRICH KOLLER
FATIH KARAOĞLAN*
Affiliation:
Çukurova Üniversitesi, Mühendislik-Mimarlık Fakültesi, Jeoloji Mühendisliği Bölümü, 01330 Balcalı, Adana, Turkey
OSMAN PARLAK
Affiliation:
Çukurova Üniversitesi, Mühendislik-Mimarlık Fakültesi, Jeoloji Mühendisliği Bölümü, 01330 Balcalı, Adana, Turkey
URS KLÖTZLI
Affiliation:
University of Vienna, Centre for Earth Sciences, A-1090 Vienna, Austria
MARTIN THÖNI
Affiliation:
University of Vienna, Centre for Earth Sciences, A-1090 Vienna, Austria
FRIEDRICH KOLLER
Affiliation:
University of Vienna, Centre for Earth Sciences, A-1090 Vienna, Austria
*
†Author for correspondence: fkaraoglan@cukurova.edu.tr
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Abstract

The Kızıldağ (Hatay) ophiolite in Turkey represents remnants of the southern Neotethyan ocean and is characterized by a complete ocean lithospheric section. It formed in a fore-arc setting above a N-dipping intraoceanic subduction zone, and represents the undeformed, more northerly part of the same thrust sheet that also forms the Baer–Bassit ophiolite to the south. The ophiolite was emplaced southwards from the southerly Neotethyan ocean in Maastrichtian time. U–Pb and Sm–Nd dates are used to constrain the crystallization age and duration of magmatic activity of the Kızıldağ ophiolite. U–Pb dating yielded ages of 91.7 ± 1.9 Ma for a plagiogranite and 91.6 ± 3.8 Ma for a cumulate gabbro. The cumulate gabbro also yielded a Sm–Nd isochron age of 95.3 ± 6.9 Ma. The measured ages suggest that the oceanic crust of the Kızıldağ ophiolite formed in a maximum time period of 6 Ma, and that the plagiogranite may have formed later than the gabbroic section. The U–Pb zircon ages from the Kızıldağ ophiolite and the cooling age of a metamorphic sole beneath the Baer–Bassit ophiolite are indistinguishable within the analytical uncertainties. This indicates the presence of young and hot oceanic lithosphere at the time of intraoceanic subduction/thrusting in the southern Neotethys. The U–Pb zircon ages from the Kızıldağ, the Troodos and the Semail ophiolites overlap within analytical uncertainties, suggesting that these ophiolites are contemporaneous and genetically and tectonically related within the same Late Cretaceous southern Neotethyan ocean.

Keywords

U–Pb datingSm–Nd datinggabbroplagiograniteKızıldağfore-arcTurkey
Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 2 , March 2013 , pp. 283 - 299
Copyright
Copyright © Cambridge University Press 2012

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