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|Title: ||The role of the Early Tertiary Ulukısla Basin, southern Turkey, in suturing of the Mesozoic Tethys ocean|
|Authors: ||Clark, Matthew|
Robertson, Alastair H F
|Issue Date: ||2002|
|Citation: ||Journal of the Geological Society, London, Vol. 159, 2002, pp. 673–690.|
|Publisher: ||Geological Society of London|
|Abstract: ||The Maastrichtian–Late Eocene Ulukısla Basin is representative of the tectonic and sedimentary
evolution of prominent Early Tertiary basins in central Anatolia, including the Tuzgolu and S arkısla basins.
The Ulukısla Basin overlies an ophiolitic melange of Late Cretaceous age between the Bolkar Carbonate
Platform to the south and the Nigde–Kırsehir metamorphic massif to the north. The basin stratigraphy records
successive phases of transgression, subsidence, volcanism, evaporite deposition, deformation and uplift.
Subsidence curves are consistent with an extensional (or transtensional) basin origin terminated by uplift. The
Ulukısla Basin includes a thick succession (c. 2 km) of Upper Paleocene–Lower Eocene basaltic to andesitic
submarine pillow lavas, lava flows, volcaniclastic rocks and intercalated limestones. Whole-rock XRF
chemical analysis indicates a within-plate origin, with a marked subduction influence, believed to be inherited
rather than contemporaneous. The Ulukısla Basin formed after Late Cretaceous ophiolite and melange
emplacement and ended with Late Eocene emergence, deformation and onset of Oligo-Miocene non-marine
deposition. We propose that Late Cretaceous ophiolite and melange emplacement reflect initial ocean basin
closure. This was followed by a long period (c. 30 Ma) of microcontinental adjustment, including possible
strike-slip, palaeorotation and suture tightening, during which the Early Tertiary Ulukısla Basin developed.
Possible driving forces were regional slab pull (of a relict subduction zone) or oblique (diachronous)
convergence. Suture tightening was complete by Late Eocene time marked by collisional deformation and
|Keywords: ||Eastern Mediterranean,|
|Appears in Collections:||Earth and Planetary Science Research Institute publications|
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