On the geodynamics of the Alpine collisional granitoids from Central Anatolia: petrology, age and isotopic characteristics of the granitoids of the Ekecikdag Igneous Association (Aksaray/Turkey)

Granitoids of the Ekecikdag Igneous Association (Central Anatolia/Turkey) are products of collisional-post-collisional magmatism in the Ekecikdag area. These granitoids are granodiorite, microgranite and leucogranite. Field relations of granodiorites with microgranites is obscured, but leucogranites intrude both rock types. Mean zircon laser ablation (LA)-ICP-MS Pb-206-U-238 ages of granodiorites and microgranites are 84.52 +/- 0.93 Ma and 80.7 +/- 1.6 Ma, respectively, and age of leucogranites is suggested as 80 Ma, based on field relations combined with Pb-206/U-238 and Rb-Sr ages. Crystallisation temperatures of granodiorites, microgranites and leucogranites are 728 degrees C-848 degrees C, 797 degrees C-880 degrees C, 704 degrees C-809 degrees C, respectively. Geochemical characteristics including Sr-Nd isotopic evidences infer a non-cogenetic character, as there is a high crustal contribution in I-type granodiorite sources, a crustal source with insignificant and significant mantle inputs in S-type microgranites and leucogranites, respectively. LA-ICP-MS Lu-Hf isotope data from zircons reveal their crustal nature (epsilon Hf-(t): -1.3 +/- 0.5 to -8.8 +/- 0.5). Crustal melting linked to the Alpine thickening during the Late Cretaceous led to formation of heterogeneous sourced granitoids with crustal dominated sources in the Ekecikdag area. Understanding of the nature and evolution of collisional Ekecikdag granitoids is not only important to put contribution in the geodynamic evolution of Central Anatolia and surrounding Alpine area, but also to better understand systematics of collisional magmatic systems.


A review of the nature of magmatism in central Anatolia during the Mesozoic post-collisional period
Duzgoren-Aydin, NS; Malpas, J; Göncüoğlu, Mehmet Cemal; Erler, A (2001-08-01)
Magmatism in central Anatolia is characterized by petrographically and chemically distinct granitic and syenitic rocks. The granitic magmatism comprises C-type (crustal-derived) and H-type (hybrid) monzogranites and monzonites. Garnet-bearing C-type leucogranites represent the oldest magmatic phase, but younger hornblende +/- biotite +/- K-feldspar H-type plutons dominate the geology of the Central Anatolian Crystalline Complex (CACC). These typically include mafic microgranular enclaves. The granitic magma...
AKIMAN, O; ERLER, A; GONCUOGLU, MC; Güleç, Nilgün Türkan; GEVEN, A; TURELI, TK; KADIOGLU, YK (1993-12-01)
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...
Implications of Jurassic chert identified in the Tokat Complex, northern Turkey
Bozkurt, Erdin; Kocyigit, A (1997-01-01)
The Tokat Complex is a strongly deformed tectono-sedimentary mixture of low-grade metamorphic rocks with abundant recrystallized limestone and relatively rare serpentinite and radiolarian chert in blocks of variable size. Samples from the radiolarian chert blocks, found in highly crushed zones, each of which corresponds to a thrust sheet within an imbricate thrust zone, have yielded a Tithonian fossil assemblage. They are interpreted as tectonic inclusions emplaced within the Tokat Complex after its main po...
An Approach to the Central Anatolian (Avanos) Late Mesozoic Magmatism: Petrology of Cogenetic Granitic and Volcanic Rocks.
Toksoy Köksal, Fatma; Köksal, Serhat (null; 2008-03-28)
The petrology of the granitic and volcanic rocks cropping out in Avanos (Nevşehir) area sheds light on the nature of magmatism in central Anatolia. In the region while granitoids intrude the Precambrian-Paleozoic-Mesozoic metamorphic basement rocks, volcanic rocks are found as dykes cutting granitoids and blocks in Late Cretaceous (?)- Early Paleocene olistostromal unit (Göncüoğlu et al., 1997; Köksal et al., 2001). The felsic intrusive rocks in the Avanos area are quartz-syenite and alkali-feldspar quartz...
Intrusive products of H2O and CO2 rich alkaline melt (Karakoç Magmatic Association): Significance in tethyan realm, Turkey
Toksoy Köksal, Fatma (null; 2012-10-01)
The Karakoç Magmatic Association (KMA) within the Central Anatolian Crystalline Complex (CACC) consists of ultramafic cumulates, layered gabbros and diorite. The KMA intruded the carbonate dominated upper part of the CACC as a network and includes host rock xenoliths. The KMA is characterized by abundance of Ca-rich phases (green diopside (Mg#=57-93), pargasite (Mg#=41-86), plagioclase (An=91-95), scapolite (Me=42-92), calcite) and Ca-free minerals (phlogopite (Mg#=71-76), alkali-feldspar). The accessories...
Citation Formats
F. Toksoy Köksal, “On the geodynamics of the Alpine collisional granitoids from Central Anatolia: petrology, age and isotopic characteristics of the granitoids of the Ekecikdag Igneous Association (Aksaray/Turkey),” GEODINAMICA ACTA, pp. 1–26, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35949.