K–Ar ages of granitoids unravel the stages of Neo-Tethyan convergence in the eastern Pontides and central Anatolia, Turkey

Boztuğ, Durmuş; Harlavan, Yehudit

doi:10.1007/s00531-007-0176-0

Cited by 91 publications

(45 citation statements)

References 48 publications

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“…The data presented establish that AIA granitoids with differing composition were formed during the Late Cretaceous between 84 and 74 Ma. The mineralogical, geochemical, and geochronological data are consistent with a multi-stage magmatic evolution of the granitoids in central Anatolia (e.g., Kadioglu et al 2006;Boztug and Harlavan 2008). The generation of S-and I-type granitoids at ca.…”

Section: Discussionmentioning

confidence: 52%

“…Accordingly, these monzonitic I-type CAG of ca. 74 Ma age, together with some A-type granitoids, are interpreted to be related to melting of lower crustal granitic and granulitic rocks, residual material from the older metamorphic and magmatic events, and probably the subcontinental lithospheric mantle rocks with heat supplied by mantle-derived mafic magma underplating of the lower crust as a result of lithospheric delamination and thinning (e.g., Göncüoglu and Türeli 1994;Aydin et al 1998;Boztug 1998Boztug , 2000Düzgören-Aydin et al 2001;Köksal et al 2004;Ilbeyli et al 2004;Boztug et al 2007a, b, c;Boztug and Arehart 2007;Boztug and Harlavan 2008;Boztug et al 2009) in this post-collisional period (Fig. 9d).…”

Section: Discussionmentioning

confidence: 97%

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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: 52%

Section: Discussionmentioning

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 closure of the southern Taurides and eastern Pontides are constrained to be Late Paleocene (OKAY and SAHINTÜ RK 1997). Late Cretaceous arc magmatism is represented predominantly by calc-alkaline basic to acidic volcanic rocks and crosscutting I-type granitoids in the northern zone of the eastern Pontides (e.g., OKAY and SAHINTÜ RK 1997;BOZTUG and HARLAVAN, 2008;KAYGUSUZ et al, 2008), and the late stages of the arc magmatism by small outcrops of Paleocene ultrapotassic plagioleucitites (ALTHERR et al, 2008). Postcollusional Eocene igneous activity is represented by andesitic to basaltic volcanics and I-type middle-to high-K-granitoids (e.g.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Petrophysical Surface Data of the Harşit Granitoid in Trabzon, in Northeastern Turkey

Aydın

Ceryan

2011

Pure Appl. Geophys.

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The Harşit granitoid in northeastern Turkey, comprises four separate granite units that are apparently unfoliated. The Harşit granitoid was investigated here by using microstructural, petrofabric and anisotropy of magnetic susceptibility (AMS) data. The structural data of the granitoid were found to be highly compatible with the zonation recognized from AMS measurements. The orientation of magnetic fabrics within the granite units indicates that tectonic deformation might have occurred coevally with the magmatic emplacement of the intrusion. When we evaluated the manners on the scale of the pluton that the disruption took place in the form of uplifting, probably related to a rapid migration of the volcanic front and the documented change from deep sea sedimentation predominant until late Cretaceous to shallower environments during the Paleocene. The possible tectonic control of fault systems on the ascent and emplacement of the granitic magma in the study area, however, cannot be completely ruled out because the Harşit granitoid is situated at or very near the NAF systems in northern Anatolia. In any case, the intrusion is clearly discordant to the regional deformational features formed during the collisional events between the Eurasia and Anatolia plates in northern Turkey.

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“…The dating of magmatism in central Anatolia was practiced in several studies. The resulting ages vary in a wide range from 58.7 Ma (Cankılı monzonite; Boztuğ and Harlavan, 2008) to 84.1 Ma (Ağaçören granite; Köksal et al, 2012). The geochemical and geochronological data from the plutonic rocks in the CACC indicate both synand postcollisional magmatism.…”

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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K–Ar ages of granitoids unravel the stages of Neo-Tethyan convergence in the eastern Pontides and central Anatolia, Turkey

Cited by 91 publications

References 48 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)

Assessment of Petrophysical Surface Data of the Harşit Granitoid in Trabzon, in Northeastern Turkey

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

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