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Contemporaneous Late Cretaceous Calc-alkaline and Alkaline Magmatism in Central Anatolia, Turkey: Oxygen Isotope Constraints on Petrogenesis

Ilbeyli, N., Pearce, Julian A., Meighan, I. G. and Fallick, A. E. 2009. Contemporaneous Late Cretaceous Calc-alkaline and Alkaline Magmatism in Central Anatolia, Turkey: Oxygen Isotope Constraints on Petrogenesis. Turkish Journal of Earth Sciences 18 (4) , pp. 529-547. 10.3906/yer-0811-8

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Abstract

A wide variety of rock types were produced by the latest Cretaceous magmatism in the Central Anatolian Crystalline Complex. These rocks can be divided into three distinct units: (i) calc-alkaline, (ii) subalkaline/transitional, and (iii) alkaline. The calc-alkaline rocks are mainly metaluminous (I-type) ranging from monzodiorite to granite. The subalkaline/transitional rocks are also metaluminous (I-type) ranging from monzonite to granite. The alkaline rocks are mainly peralkaline (A-type), ranging from feldspathoid-bearing monzosyenite to granite. Whole-rock oxygen isotope data from the complex have a considerable range of δ18O values between 6.5‰ and 14.8‰. Initial 87Sr/86Sr versus 143Nd/144Nd ratios, and both ratios versus δ18O values diagrams show that the intrusive rocks are derived from a subduction-modified mantle and also have experienced fractional crystallisation coupled with crustal assimilation.Delamination of a thermal boundary layer, and/or slab breakoff is the likely mechanisms for the initiation of the diverse magmatism in the complex.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: I-type granite ; A-type granite ; Oxygen isotope ; Kaman-Kırşehir region ; Central Anatolia ; Turkey
ISSN: 1300-0985
Last Modified: 04 Jun 2017 02:00
URI: http://orca-mwe.cf.ac.uk/id/eprint/7515

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