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Oxygen and sulfur isotope geochemistry revealing a significant crustal signature in the genesis of the post-collisional granitoids
 

Summary: Oxygen and sulfur isotope geochemistry revealing a significant
crustal signature in the genesis of the post-collisional granitoids
in central Anatolia, Turkey
Durmus▀ Boztug a,*, Greg B. Arehart b
a
Department of Geological Engineering, Cumhuriyet University, 58140 Sivas, Turkey
b
Department of Geological Sciences, University of Nevada, Reno, NV 89557-0138, USA
Received 13 September 2005; received in revised form 7 April 2006; accepted 20 November 2006
Abstract
Late Cretaceous granitoid rocks from central Anatolia comprise S-I-A-type plutons derived from the collisional stages of the Neo-
Tethyan convergence system in central Turkey. These granitoids intrude the tectonic imbrication zone consisting of blocks of supra-sub-
duction zone-type (SSZ-type) central Anatolian ophiolite and crustal metasediments which are present in the _Izmir-Ankara-Erzincan
suture zone. The plutons are overlain by Late Palaeocene-Early Eocene or younger detrital sediments. Granitoid formation is thought
to be related to magma generation processes occurring in a post-collisional lithospheric detachment-related geodynamic setting that
resulted from slab break-off or lithospheric delamination. Whole-rock S and quartz/feldspar O isotope data from these plutons yields
a broad range of values, and both parameters indicate a nearly exclusively supracrustal origin for the S-type granites, as well as a sig-
nificant crustal contribution in the genesis of the hybrid I-type and A-type granitoids. The more mafic I-type and A-type granitoid rocks
of any given suite have lower S and O values, indicative of their larger degree of mantle component. The combined stable isotope geo-
chemical compositions, when coupled with major, trace and REE geochemistry and regional geology, provide evidence that the signif-

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences