Contemporaneous late cretaceous calc-alkaline and alkaline magmatism in Central Anatolia, Turkey: oxygen isotope constraints on petrogenesis

Ilbeyli, N., Pearce, J.A., Meighan, I.G. and Fallick, A. (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. (doi: 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:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fallick, Professor Anthony
Authors: Ilbeyli, N., Pearce, J.A., Meighan, I.G., and Fallick, A.
Subjects:Q Science > QE Geology
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Turkish Journal of Earth Sciences
Journal Abbr.:Turkish J. Earth Sci.
ISSN:1300-0985
ISSN (Online):1303-619X
Published Online:30 April 2009

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