Geochemical characteristics of granitoids along the western margin of the Central Anatolian Crystalline Complex and their tectonic implications

Abstract

The closely related assemblage of igneous and metamorphic rocks that lie within a triangular area approximately bounded by the Tuzgolu Fault, the EcemiS Fault and the Izmir-Ankara-Erzincan Suture and between the lines connecting Ankara, Sivas and Nigde is called the Central Anatolian Crystalline Complex (CACC). The granitoids cropping out within the CACC can be divided areally into three groups: (1) a large number of individual small plutons which form an arcuate set and curve from NE-SW to NW-SE and extend from Sulakyurt to Nigde along the western margin; (2) a relatively narrow and smaller set of disconnected plutons extending from Sivas to Camardi along the eastern margin; and (3) a very large batholith along the northern margin exposed around Yozgat.This study deals only with the first group of rocks. Geochemical data have been used to classify the granitoids, to determine their chemical characteristics, and to estimate the possible source regions and tectonic environment of magma generation and emplacement. The geochemical data indicate that these western margin granitoids range in composition from monzonitic to granitiogranodioritic varieties, belong to the alumina-cafemic and cafemic associations and possess either a metaluminous or peraluminous character. All granitoid types display features which may indicate the presence of both S-and 1-type igneous rocks. Interpretation of the trace element data suggests a syncollisional to late/post-collisional tectonic setting and a continental crustal source for the granitoids.

Hybridization of mafic microgranular enclaves: mineral and whole-rock chemistry evidence from the Karamadazı Granitoid, Central Turkey

“…1b). Both granitoids are considered to be cogenetic with similar granitoids from Central Anatolia Kuscu et al 2001), whose tectonic settings are suggested as collisional/post-collisional (Goncuoglu and Tureli 1994;Akiman et al 1993;Erler and Goncuoglu 1996;Boztug 1998Boztug , 2000Aydin et al 1998;Yaliniz et al 1999) and/or magmatic arc (Gorur et al 1984;Kocak 1993;Kocak and Leake 1994;Kadioglu and Gulec 1996).…”

Geological, petrological, and geodynamical characteristics of the Karacaali Magmatic Complex (Kırıkkale) in the Central Anatolian Crystalline Complex, Turkey

“…They lie within the metaluminous to peraluminous and also the I-type granite field (Figure 9a). The majority of the granitoid components from the CACC plutons show a calcalkaline affinity, with a metaluminous to peraluminous character, and they mainly plot within the volcanic arc and collisional granite field on the trace element discrimination diagrams (Akıman et al, 1993;Kuşcu et al, 2002;Kadıoğlu et al, 2003 and references therein;İlbeyli et al, 2009). Metaluminous to peraluminous I-type granitoids are interpreted to have originated in a volcanic arc setting (Kim et al, 2005).…”

Menderes Massif (Western Turkey): structural, metamorphic and magmatic evolution - a synthesis

“…The post-collisional granitoids intrude the metamorphic rocks and the ophiolites during and after the southward obduction of the ophiolitic rocks from Neotethys onto the Tauride±Anatolide Block during the Late Cretaceous Göncüog AE lu et al 1991;Akõman et al 1993), but before the Late Maastrichtian (Yalõnõz et al 1996). The isotopic data on the age of granitoids are scarce and range from 54 to 110 14 Ma (Ayan 1963;Ataman 1972;Göncüog AE lu 1986;Güleç 1994;Yalõnõz et al 1999).…”