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The geochemistry and tectonic setting of the Demirköy pluton of the Srednogorie–Istranca granitoid chain, NW Turkey

Published online by Cambridge University Press:  05 July 2018

A. Aykol  and
S. Tokel
A. Aykol
Affiliation:
Department of Geological Engineering, İstanbul Technical University, Ayazaǧa, İstanbul, Turkey
S. Tokel
Affiliation:
Department of Geological Engineering, Black Sea Technical University, Trabzon, Turkey
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Abstract

The chain of Late Subhercynian granitoids can be traced along the Srednogorie-Istranca-Pontid belt. The Demirköy pluton outcrops in the Istranca segment. The rocks of the pluton range from diorite through grandiorite to perthite granite with granodiorite predominating. On the basis of 25 chemical analyses, the intrusive setting of the granitoid has been investigated. Calcic to calc-alkaline and peraluminous to metaluminous character indicate a subduction-related origin. Low to moderate concentrations of the large-ion lithophiles (LIL), high field strength elements (HFS), light rare earth elements (La, Ce) and low HFS/LIL ratios indicate a mantle-derived magma with subduction-related enrichment. Trace element discrimination diagrams such as Rb/Zr-Nb, Rb/Zr-Y, Rb-SiO2 and Rb-(Nb + Y), are particularly indicative of normal arc-setting for the samples.

The Demirköy granitoid is chemically indistinguishable from the Upper Cretaceous granitoids of Strednogorie to the west and the Pontids to the east. This extensive maximum of plutonism can be considered as a time marker in the northern Tethys subduction system.

Keywords

geochemistrygranitoidplate tectonicsTurkey
Type
Petrology
Information
Mineralogical Magazine , Volume 55 , Issue 379 , June 1991 , pp. 249 - 256
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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