Mineralogy, petrography and whole-rock geochemistry of the Tertiary granitic intrusions in the Eastern Pontides, Turkey

Arslan, Mehmet; Aslan, Zafer

doi:10.1016/j.jseaes.2005.03.002

Cited by 145 publications

(56 citation statements)

References 31 publications

(74 reference statements)

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“…These intrusive units represent modes of occurrences ranging from shallowseated porphyritic emplacements to small stocks and dykes. Middle Eocene multi-sourced granitoids ranging compositionally from alkaline syenites to calc-alkaline granodiorites have already been reported by Karslı (2002) and Arslan and Aslan (2006) from the eastern part of Gümüşhane area Dölek and Sarıçiçek plutons ( Fig. 1; Table 2).…”

Section: Cacc and East-central Anatolia: Late Cretaceous Bi-modal A-supporting

confidence: 68%

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

Boztuğ

Harlavan

2007

Int J Earth Sci (Geol Rundsch)

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K-Ar dating of mineral separates extracted from various granitoid rock units of the eastern Pontides and central Anatolia, Turkey, has provided some new insights unravelling various stages of the Neo-Tethyan convergence system, which evolved with northward subduction between the Eurasian plate (EP) to the north and the Tauride-Anatolide platform (TAP) to the south along the _ Izmir-Ankara-Erzincan suture (IAES) zone. Arcrelated granitoid rocks are only encountered in the eastern Pontides and yield K-Ar cooling ages of both Early Cretaceous (138.5 ± 2.2 Ma) (early arc), and Late Cretaceous, ranging from 75.7 ± 0.0 to 66.5 ± 1.5 Ma (mature arc), respectively. The multi-sourced granitoids of the eastern Pontides, with a predominant mantle component and K-Ar ages between 40 and 50 Ma, are considered to be a part of post-collisional slab break-off magmatism accompanied by tectonic denudation of pre-Late Cretaceous granitoid rocks following juxtaposition of the EP and the TAP around 55-50 Ma in the eastern Pontides. The K-Ar cooling ages of collision-related S-, I-and A-type granitoids in central Anatolia reflect good synchronism between 80 and 65 Ma, suggesting a coeval genesis in a unique geodynamic setting but with derivation from various sources-namely, purely crustal, purely mantle and/or of mixed origin. This sort of simultaneous generation model for these S-I-A-type intrusives seems to be consistent with a post-collisional lithospheric detachment related geodynamic setting. I-type granodioritic to tonalitic intrusives with K-Ar cooling ages ranging from 40 to 48 Ma in east-central Anatolia are interpreted to have been derived from a post-collisional, within-plate, extension-related geodynamic setting following the amalgamation of the EP and the TAP in eastcentral Anatolia.

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Section: Cacc and East-central Anatolia: Late Cretaceous Bi-modal A-supporting

confidence: 68%

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

Boztuğ

Harlavan

2007

Int J Earth Sci (Geol Rundsch)

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“…The vanishing of the northern branch of the Neo-Tethyan ocean during the Cretaceous and subsequent collision of the Pontides and Anatolide-Tauride microcontinents with the CACC in the Paleocene gave rise to a long and narrow ophiolitic mélange belt called the IAESZ at the northern part of the Anatolian Plate (Şengör and Yılmaz, 1981;Okay and Tüysüz, 1999) (Figure 1a). Around both sides and along this suture zone, postcollisional Eocene magmatism (particularly Middle Eocene) developed through the western to eastern part of the Anatolian Plate and is represented by granitoids (Harris et al, 1994;Genç and Yılmaz, 1997;Topuz et al, 2005;Arslan and Aslan, 2006;Okay and Satır, 2006;Karslı et al, 2007Karslı et al, , 2011Boztuğ, 2008;Karacık et al, 2008;Ustaömer et al, 2009;Altunkaynak et al, 2012;Gülmez et al, 2013;Öztürk, 2015, Özdamar et al 2017), gabbroic intrusions (Boztuğ et al, 1998;Temizel et al, 2014;Eyuboglu et al, 2016), and calcalkaline, mildly alkaline, and potassic/shoshonitic volcanic products (Figure 1b;Peccerillo and Taylor, 1976;Keskin et al, 2008 and references therein; Karslı et al, 2011, Kaygusuz et al, 2011Arslan et al, 2013 and references therein; Aydınçakır and Şen, 2013;Dokuz et al, 2013;Gülmez et al, 2013;Aslan et al, 2014;Aydınçakır, 2014, Sipahi et al, 2014Yücel et al, 2014;Kasapoğlu et al, 2016;Temizel et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

40Ar-39Ar geochronology and petrogenesis of postcollisional trachytic volcanism along the İzmir-Ankara-Erzincan Suture Zone (NE, Turkey)*

Göçmengil¹,

Karacık²,

Genç³

et al. 2018

Turkish J Earth Sci

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The obliteration of the Neo-Tethyan Ocean and collision of the microplates along the northern part of Turkey led to the development of the İzmir-Ankara-Erzincan suture zone (IAESZ). After the collision of Pontides with the Central-Anatolian Crystalline Complex (CACC) in the Paleocene, a new phase of extension and volcanism concomitantly developed along the northern (Almus; Pontides) and southern (Yıldızeli; CACC) sides and along the IAESZ during the Middle Eocene time interval. The first products of the Middle Eocene volcanism in these areas are represented by calc-alkaline to alkaline (basic-intermediate) volcanic and volcanoclastic units together with late-stage trachytic dikes, plugs, and stocks. The mantle source area of both volcanic units displays a metasomatized character, which was dominantly fluxed by sediment-sourced melts. The partial melting of the metasomatized source area gave rise to first-stage basic-intermediate volcanism in the crustal levels. Simultaneously with the generation of the first-stage volcanism, basaltic trachyandesitic shallow-seated magma mushes were also developed. The reactivation of these shallow-seated mushes by latestage extensional tectonics gave rise to the development of trachytic volcanism in both regions, which have a high-K to shoshonitic character. Almus trachytic lavas are phenocryst-poor and have differentiated Mg# numbers (avg. 26). On the other hand, Yıldızeli trachytic lavas have a broad compositional range (benmoreite to latite); they are phenocryst-rich and show more basic character (Mg# avg. 40). Trachytic volcanism in both areas is largely controlled by fractional crystallization of similar basaltic trachyandesitic parental magma with minor assimilation of the upper crustal lithologies. 40 Ar-39 Ar ages from sanidine phenocrysts from both areas also confirm that trachytic volcanism in both regions developed nearly coevally in different tectonic blocks (~41-40 Ma). Generation of similar volcanism on the different tectonic blocks during the postcollisional stage was probably governed by a regional-scale delamination and/ or lithospheric removal-related tectonomagmatic processes.

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“…The syncollisional granitoids, which intrude the arc-related granodiorites and granites, are biotite leucogranites with peraluminous S-type chemical and mineralogical compositions (Boztug et al 2003). The Eocene post-collisional extension-related intrusive rocks form small stocks of diorites and quartz diorites/monzodiorites of calc-alkaline to tholeitic affinity, and syenites to monzonites of alkaline affinity (Yılmaz and Boztug 1996;Boztug et al 2003;Arslan and Aslan 2005). In the Torul region of the Eastern Pontides, arc-related magmatism developed under a compressional regime and is characterized by the predominance of calc-alkaline granitoids.…”

Section: Introductionmentioning

confidence: 99%

Petrochemistry and petrology of I-type granitoids in an arc setting: the composite Torul pluton, Eastern Pontides, NE Turkey

Kaygusuz

Siebel

Şen

et al. 2007

Int J Earth Sci (Geol Rundsch)

131

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The Upper Cretaceous Torul pluton, located in the Eastern Pontides, is of sub-alkaline affinity and displays features typical of volcanic arc granitoids. It is a composite pluton consisting of granodiorite, biotite hornblende monzogranite, quartz monzodiorite, quartz monzonite and hornblende biotite monzogranite. The oldest syenogranite (77.9 ± 0.3 Ma) and the youngest quartz diorite form small stocks within the pluton. Samples from the granodiorites, biotite hornblende monzogranites, quartz monzodiorites, quartz monzonites and hornblende biotite monzogranites have SiO 2 between 57 and 68 wt% and display high-K calc-alkaline, metaluminous to peraluminous characteristics. Chondrite-normalized REE patterns are fractionated (La cn /Lu cn = 6.0-14.2) with pronounced negative Eu anomalies (Eu/Eu* = 0.59-0.84). Initial e Nd(i) values vary between -3.1 and -4.1, initial 87 Sr/ 86 Sr values between 0.7058 and 0.7072, and d 18 O values between +4.4 and +7.3&. The quartz diorites are characterized by relatively high Mg-number of 36-38, low contents of Na 2 O (2.3-2.5 wt%) and SiO 2 (52-55 wt%) and medium-K calcalkaline, metaluminous composition. Chondrite-normalized REE patterns are relatively flat [(La/Yb) cn = 2.8-3.3; (Tb/Yb) cn = 1.2] and show small negative Eu anomalies (Eu/Eu* = 0.74-0.76). Compared to the other rock types, radiogenic isotope signatures of the quartz diorites show higher 87 Sr/ 86 Sr (0.7075-0.7079) and lower e Nd(i) (-4.5 to -5.3). The syenogranites have high SiO 2 (70-74 wt%) and display high-K calc-alkaline, peraluminous characteristics. Their REE patterns are characterized by higher La cn /Lu cn (12.9) and Eu/Eu* (0.76-0.77) values compared to the quartz diorites. Isotopic signatures of these rocks [e Nd(i) = -4.0 to -3.3; 87 Sr/ 86 Sr (i) = 0.7034-0.7060; d 18 O = + 4.9 to + 8.2] are largely similar to the other rock types but differ from that of the quartz diorites. Fractionation of plagioclase, hornblende, pyroxene and Fe-Ti oxides played an important role in the evolution of Torul granitoids. The crystallization temperatures of the melts ranged from 800 to 900°C as determined from zircon and apatite saturation thermometry. All these characteristics, combined with low ) ratios suggest an origin through dehydration melting of mafic lower crustal source rocks.

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Mineralogy, petrography and whole-rock geochemistry of the Tertiary granitic intrusions in the Eastern Pontides, Turkey

Cited by 145 publications

References 31 publications

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

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

40Ar-39Ar geochronology and petrogenesis of postcollisional trachytic volcanism along the İzmir-Ankara-Erzincan Suture Zone (NE, Turkey)*

Petrochemistry and petrology of I-type granitoids in an arc setting: the composite Torul pluton, Eastern Pontides, NE Turkey

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