Tectonomagmatic evolution of bimodal plutons in the central Anatolian crystalline complex, Turkey

Kadioglu, Yk
Dilek, Y
Güleç, Nilgün Türkan
Foland, Ka
The NW-trending Agacoren Intrusive Suite (AIS) on the east side of the Salt Lake (Tuz Golu), Turkey, is part of a curvilinear volcanoplutonic complex along the western edge of the central Anatolian crystalline complex (CACC). Granitoids constitute the predominant lithological group within the AIS and range in composition from monzonite through granite to alkali feldspar granite. Gabbroic rocks occur as irregular intrusive bodies with sinusoidal, irregular contacts with the granitoid plutons and vary from dioritic compositions at the contacts to cumulate amphibole gabbros in their center. These gabbroid to granitoid rocks are all subalkaline and display tholeiitic to calcalkaline affinities, respectively. Modeling of the major element and trace element chemistry of the granitoids to gabbroids, together with their field relations, suggest that these rocks formed synchronously from a melt source that involved both mantle and crustal components. Mafic magmas were likely derived from a metasomatized upper mantle source above a subduction zone and were injected into crustal-level felsic magma chamber(s) in which incomplete mixing, commingling, and crystal fractionation processes produced the coeval granitoid to gabbroid plutons. New Ar-40/Ar-39 ages at 78.0+/-0.3 Ma to 78.8+/-1.0 Ma for the gabbros and 77.6+/-0.3 Ma for the granitoids support this petrogenetic interpretation. Aeromagnetic anomalies of the AIS also suggest that gabbroid to granitoid intrusions coalesce into a larger, single igneous mass at a depth of 1.55 km beneath the earth's surface. These findings collectively rule out an allochthonous, "ophiolitic" origin for the AIS gabbros. The AIS is interpreted as part of a Late Cretaceous volcanoplutonic complex, which evolved at the active margin of the western CACC (in the present coordinate system) as an Andean-style magmatic arc. This tectonic model implies that a major Tethyan seaway, the floor of which was consumed beneath the magmatic arc, separated the Tauride carbonate platform from the CACC during much of the Mesozoic.


The Upper Cretaceous intrusive rocks with extensive crustal contribution in Hacimahmutusagi Area (Aksaray/Turkey)
Köksal, Serhat (Central Library of the Slovak Academy of Sciences, 2019-06-01)
The Hacimahmutusagi area (Aksaray/Turkey) is located in the western part of the Central Anatolian Crystalline Complex (CACC). Gneiss and marble compose the basement units, while intrusive rocks are gabbros and granitoids. The pegmatitic hornblende gabbros contain pegmatitic to fine-grained hornblendes, plagioclase, clinopyroxene, and accessory opaque minerals. The fine-grained gabbros, on the other hand, are composed of plagioclase, hornblende, and biotite as major components whereas the apatite and opaque ...
Mafic microgranular enclaves and interaction between felsic and mafic magmas in the agacoren intrusive suite: Evidence from petrographic features and mineral chemistry
Kadioglu, Yusuf Kagan; Güleç, Nilgün Türkan (Informa UK Limited, 1996-01-01)
The Agacoren Intrusive Suite is exposed as a large intrusive body over ∼500 km2 east of Lake Tuz in central Anatolia and consists of the Cokumkaya gabbro, the Agacoren granitoid, and young dikes. The Agacoren granitoid is the predominant lithology of the Agacoren Intrusive Suite, and is differentiated into several subunits ranging in composition from monzonite, through granite, to alkali feldspar granite. The Cokumkaya gabbro occurs as stocks enclosed in the Agacoren granitoid; individual bodies range in si...
Tectonic evolution of the Gediz Graben: field evidence for an episodic, two-stage extension in western Turkey
Bozkurt, Erdin (Cambridge University Press (CUP), 2004-01-01)
Western Turkey is one of the most spectacular regions of widespread active continental extension in the world. The most prominent structures of this region are E-W-trending grabens (e.g. Gediz and Buyuk Menderes grabens) and intervening horsts, exposing the Menderes Massif. This paper documents the result of a recent field campaign (field geological mapping and structural analysis) along the southern margin of the modern Gediz Graben of Pliocene (similar to 5 Ma) age. This work provides field evidence that ...
Rapid cooling history of a Neotethyan ophiolite: Evidence for contemporaneous subduction initiation and metamorphic sole formation
PARLAK, OSMAN; Dunkl, Istvan; KARAOĞLAN, FATİH; Kusky, Timothy M.; Zhang, Chao; Wang, Lu; Koepke, Juergen; Billor, Zeki; Hames, Willis E.; ŞİMŞEK, EMRAH; Simsek, Gokce; ŞİMŞEK, TUĞÇE; Ozturk, Selena Ezgi (Geological Society of America, 2019-11-01)
The Beywhir-Hoyran Nappes, including Mesozoic carbonate platform rocks, deepsea sediments, and ophiolite-related units, crop out extensively on the western limb of the Isparta Angle in the Central Taurides, Turkey. The ophiolite-related rocks are represented by variably serpentinized harzburgitic mantle tectonites, tectonically underlain by a subophiolitic metamorphic sole and melange. The harzburgitic mantle tectonites and metamorphic sole are intruded by undeformed isolated dikes. Protoliths of the metamo...
Tectonic geomorphology and Plio-Quaternary structural evolution of the Tuzgolu fault zone, Turkey: Implications for deformation in the interior of the Central Anatolian Plateau
Krystopowicz, Neil J.; Schoenbohm, Lindsay M.; Rimando, Jeremy; Brocard, Gilles; Rojay, Fuat Bora (Geological Society of America, 2020-10-01)
Situated within the interior of the Central Anatolian Plateau (Turkey), the 200-km-long Tuzgolu extensional fault zone offers first-order constraints on the timing and pattern of regional deformation and uplift. In this study, we analyze the morphometrics of catchments along the Tuzgolti range-front fault and the parallel, basinward Hamzali fault using a variety of measured morphometric indicators coupled with regional geomorphic observations and longitudinal profile analysis. In addition, we use field and ...
Citation Formats
Y. Kadioglu, Y. Dilek, N. T. Güleç, and K. Foland, “Tectonomagmatic evolution of bimodal plutons in the central Anatolian crystalline complex, Turkey,” JOURNAL OF GEOLOGY, pp. 671–690, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48144.