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K-Ar age, whole-rock and stable isotope geochemistry of A-type granitoids in the Divrigi-Sivas region, eastern-central Anatolia, Turkey
 

Summary: K-Ar age, whole-rock and stable isotope geochemistry of A-type granitoids in the
Divrigi-Sivas region, eastern-central Anatolia, Turkey
Durmu BOZTU(1)
, Yehudit HARLAVAN(2)
, Greg B. AREHART(3)
and Necmettin AVCI(4)
(1): Dept. of Geological Engineering, Cumhuriyet Univ., 58140 Sivas, Turkey
(2): Geological Survey of Israel, 30 Malkhe Israel St. 95501, Jerusalem, Israel
(3): Department of Geological Sciences, University of Nevada, Reno, 89557-0138 USA
(4): MTA General Directorate, 06531 Balgat, Ankara, Turkey
The bimodal, A-type Dumluca and Murmana granitoids, consist of felsic
monzonitic/syenitic and mafic monzogabbroic/monzodioritic rocks and intruded the Cretaceous
ophilitic suture zone. These intrusions resulted from the slab break-off stage of the Neo-tethyan
convergence system along the Izmir-Ankara-Erzincan suture zone in the Divrigi-Sivas region,
eastern-central Anatolia, Turkey. These intrusions are also associated with giant contact
metasomatic skarn and hydrothermal iron oxide deposits that occur where three rock types are in
close proximity: ultramafics, limestones, and granitoids. New hornblende and biotite K-Ar dates
yield cooling ages ranging from 76.6 + 0.6 to 77.4 + 1.5 Ma, and from 62.1 + 0.3 to 73.0 + 1.2 Ma
for the felsic and mafic rocks, respectively, in the Murmana pluton. Similarly, the felsic and mafic
rocks of the Dumluca batholith also give some hornblende and biotite K-Ar ages from 71.5 + 0.1 to

  

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

 

Collections: Geosciences