Extrusive Members of Postcollisional A-Type Magmatism in Central Anatolia: Karahidir Volcanics, Idis Dagi-Avanos Area, Turkey

Köksal, Serhat; Göncüoğlu, M. Cemal; Floyd, P. A.

doi:10.1080/00206810109465041

Cited by 35 publications

(27 citation statements)

References 14 publications

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“…Extension continued in the late Campanian-early Maastrichtian and was characterized by the formation of the silica-saturated to undersaturated A-type granitoids and associated volcanic rocks (e.g., Boztug 2000;Köksal et al 2001;Boztug and Arehart 2007). The post-collisional thickening period in central Anatolia ended with formation of A-type granitoids (e.g., Köksal et al 2004) and changed into an extensional regime, characterized by alkaline volcanic rocks Alpaslan et al 2004Alpaslan et al , 2006Kurt et al 2008), while the Sakarya Continent was juxtaposed to the CACC with the Ankara mélange in between those units (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Köksal

Möller

Göncüoğlu

et al. 2011

Contrib Mineral Petrol

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Geochemical and isotopic evidence from the Agaçören Igneous Association in central Anatolia-Turkey indicates that this suite of calc-alkaline granitic rocks have undergone crustal homogenization during regional metamorphic and related magmatic events. Whole-rock chemical and Sr-Nd isotopic data of the granitoids reveal crustal affinity with an earlier subduction component. Zircons show inherited cores and subsequent magmatic overgrowths. The laser ablation ICP-MS 206 Pb/ 238 U zircon ages are determined as 84.1 ± 1.0 Ma for the biotite-muscovite granite, 82.3 ? 0.8/-1.1 Ma for the hornblende-biotite granite, 79.1 ? 2.1/-1.5 Ma for the granite porphyry dyke, 75.0 ? 1.0/-1.0 Ma for the alkali feldspar dyke, and 73.6 ± 0.4 Ma for the monzonite. This is interpreted as continuous magma generation, possibly from heterogeneous sources, from ca. 84 to 74 Ma during the closure of the northern branch of the Neotethyan Ocean. The oldest granitoids (84-82 Ma) were probably formed due to crustal thickening after obduction of the MORB-type oceanic crust onto the Tauride-Anatolide microplate. The younger granitoids are interpreted to be related to the subsequent post-collisional extension after lithospheric delamination. Combination of the laser ablation ICP-MS zircon Lu-Hf isotope data with the U-Pb ages of inherited cores suggests that Cretaceous granitoids formed by melting of heterogeneous crustal protoliths, which results in significant variation in eHf (t) data (from -12.9 to ?2.2). These protoliths were probably composed of reworked Early Proterozoic crust, minor juvenile Late Proterozoic magmatic components, and Paleozoic to pre-Late Cretaceous recycled crustal material. Moreover, the Late Cretaceous zircon domains of the different granitoids are characterized by a crustal signature, with a relatively restricted zircon eHf (t) data ranging from -4.1 to -8.8. This variation is only about twice the reproducibility (ca. ±1 eHf) of the data, but Communicated by J. Hoefs. Electronic supplementary materialThe online version of this article (much smaller than the isotope variability of inherited zircons. Our preferred interpretation is effective isotopic homogenization of the heterogeneous central Anatolian crust during the Late Cretaceous high-grade metamorphic and magmatic events, a process that we propose to be relevant for other active continental margins.

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Section: Discussionmentioning

confidence: 99%

“…1). Younger, overlying non-metamorphic units are Late Maastrichtian clastic rocks, Paleocene-Eocene volcanic, volcanoclastic and sedimentary rocks, and NeogeneQuaternary Cappadocian volcanic rocks, carbonate and clastic cover units (e.g., Aydar et al 1995;Göncüoglu et al 1997;Köksal et al 2001) (Fig. 1).…”

Section: Geological Frameworkmentioning

confidence: 97%

Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Köksal

Möller

Göncüoğlu

et al. 2011

Contrib Mineral Petrol

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“…The relationship between the granitic rocks and the Neo-Tethyan convergence system is summarized as including: (1) a late Cretaceous syn-collisional leucogranitic association (Boztug 2000;Boztug et al 2003); (2) a late Cretaceous to Palaeocene post-collisional I-type monzonitic to quartz monzonitic association (Yalnz et al 2000;Düzgören Aydn et al 2001;_ I Ilbeyli et al 2004); and (3) an A-type syenitic to monzonitic association (Boztug 1998(Boztug , 2000Köksal et al 2001;Boztug et al 2003). In contrast, Kadoglu et al (2003) also propose the existence of arc-related intrusives in the Central Anatolian granitoids.…”

Section: Introductionmentioning

confidence: 98%

“…Recently, the genesis of the late Cretaceous to early Tertiary granitic rocks of central and eastern Central Anatolia have been interpreted in relation to the Neo-Tethyan convergence system in Turkey (Boztug 2000;Yalnz et al 2000;Köksal et al 2001;Düzgören-Aydn et al 2001;Boztug et al 2003;_ I Ilbeyli et al 2004). The relationship between the granitic rocks and the Neo-Tethyan convergence system is summarized as including: (1) a late Cretaceous syn-collisional leucogranitic association (Boztug 2000;Boztug et al 2003); (2) a late Cretaceous to Palaeocene post-collisional I-type monzonitic to quartz monzonitic association (Yalnz et al 2000;Düzgören Aydn et al 2001;_ I Ilbeyli et al 2004); and (3) an A-type syenitic to monzonitic association (Boztug 1998(Boztug , 2000Köksal et al 2001;Boztug et al 2003).…”

Section: Introductionmentioning

confidence: 99%

K-Ar age determination, whole-rock and oxygen isotope geochemistry of the post-collisional Bizmişen and Çaltı plutons, SW Erzincan, eastern Central Anatolia, Turkey

et al. 2005

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Post-collisional granitoid plutons intrude obducted Neo-Tethyan ophiolitic rocks in central and eastern Central Anatolia. The Bizmişen and Ç alt plutons and the ophiolitic rocks that they intrude are overlain by fossiliferous and flyschoidal sedimentary rocks of the early Miocene Kemah Formation. These sedimentary rocks were deposited in basins that developed at the same time as tectonic unroofing of the plutons along E-W and NW-SE trending faults in Oligo-Miocene time. Mineral separates from the Bizmişen and Ç alt plutons yield K-Ar ages ranging from 42 to 46 Ma, and from 40 to 49 Ma, respectively. Major, trace, and rare-earth element geochemistry as well as mineralogical and textural evidence reveals that the Bizmişen pluton crystallized first, followed at shallower depth by the Ç alt pluton from a medium-K calcalkaline, I-type hybrid magma which was generated by magma mixing of coeval mafic and felsic magmas. Delta 18 O values of both plutons fall in the field of I-type granitoids, although those of the Ç alt pluton are consistently higher than those of the Bizmişen pluton. This is in agreement with field observations, petrographic and whole-rock geochemical data, which indicate that the Bizmişen pluton represents relatively uncontaminated mantle material, whereas the Ç alt pluton has a significant crustal component.Structural data indicating the middle Eocene emplacement age and intrusion into already obducted ophiolitic rocks, suggest a post-collisional extensional origin. However, the pure geochemical discrimination diagrams indicate an arc origin which can be inherited either from the source material or from an upper mantle material modified by an early subduction process during the evolution of the Neo-Tethyan ocean.

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“…According to Boztuğ (1998), Yalınız et al (1999), Köksal et al (2001Köksal et al ( , 2004, Boztuğ et al (2003, and İlbeyli et al (2004), central Anatolian granitoids formed in a syn-to postcollisional geodynamic setting associated with the closure of the İzmir-Ankara-Erzincan ocean. On the other hand, Kadıoğlu et al (2006) proposed that Late Cretaceous plutonic rocks in central Anatolia were emplaced following the obduction of Tethyan ophiolites and therefore their evolution preceded the continental collision in the region.…”

Section: Geologic Settingmentioning

confidence: 99%

Geochemical, microthermometric, and isotopic constraints on the origin of fluorite deposits in central Anatolia, Turkey

Coşanay¹,

Kirat²,

Çevik³

et al. 2017

Turkish J Earth Sci

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We investigate rare earth element geochemistry, microthermometric characteristics, and radiogenic isotope systematics of fluorites and stable isotope compositions of gangue minerals from several fluorite deposits in central Turkey. In the deposits, fluorite is the main ore mineral and it is accompanied by quartz, calcite, and minor pyrite and barite. Veins are represented by three different fluorite types based on their color. Total REY contents of fluorites are highly variable, ranging from 24 to 693 ppm. LREE concentrations of fluorites of all colors are similar but medium and heavy REE abundances of green fluorites are nearly an order of magnitude greater than in both host rocks and purple and yellow fluorites, indicating multiple sources for crystallization. REEs show significant fractionation and purple fluorites with relatively low HREE contents were likely precipitated at an earlier stage. As crystallization continued, green fluorites were nucleated because of ion exchange of LREEs with the host rock/minerals. Fluid inclusions yielded a wide range of homogenization temperatures from 86 °C to 292 °C and salinities from 0 to 20 wt.% NaCl equiv. The 87 Sr/ 86 Sr ratios of fluorites, varying from 0.707627 to 0.709380, overlap with the range of host rocks. 143 Nd/ 144 Nd values suggest two populations: purple fluorites with less radiogenic and green fluorites with more radiogenic Nd isotope ratios. The Sr-Nd isotope systematics of Bayındır fluorites are consistent with that of the Bayındır syenite, indicating that hydrothermal solutions progressively reacted with the host rock until equilibrium was established. δ 18 O values of quartz are slightly higher than the magmatic range. δ 13 C and δ 18 O of calcites fall into the range of marine carbonates. δ 34 S values of barites indicate derivation from diverse reservoirs changing from marine to terrestrial sources. In contrast, sulfur in pyrites points to a magmatic origin. Therefore, is it suggested that magmatic fluids to some extent contributed to the precipitation of fluorite veins.

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Extrusive Members of Postcollisional A-Type Magmatism in Central Anatolia: Karahidir Volcanics, Idis Dagi-Avanos Area, Turkey

Cited by 35 publications

References 14 publications

Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

K-Ar age determination, whole-rock and oxygen isotope geochemistry of the post-collisional Bizmişen and Çaltı plutons, SW Erzincan, eastern Central Anatolia, Turkey

Geochemical, microthermometric, and isotopic constraints on the origin of fluorite deposits in central Anatolia, Turkey

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