40Ar-39Ar ages and petrogenesis of middle Eocene post-collisional volcanic rocks along the Izmir-Ankara-Erzincan suture zone, NE Turkey

Göçmengil, Gönenç; Karacık, Zekiye; Genç, Ş. Can; Prelević, Dejan; Billor, Zeki

doi:10.1016/j.jseaes.2019.01.001

Cited by 9 publications

(7 citation statements)

References 98 publications

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“…The late-stage trachytic volcanism along both the Almus and Yıldızeli regions was generated at the final stages of the extensional phase along the IAESZ. Freshly developed basic to intermediate crystal mush at the Eocene (~44 Ma: Göçmengil et al, 2017) of both areas was possibly reactivated by extensional cracks during the last phase and developed along localized extensional faults (~41-40 Ma) (Figures 16c and 16d), which is also supported by geological mapping. The extensional tectonics probably helped decompression in the upper crustal magma chambers.…”

Section: Thermal Parameterssupporting

confidence: 64%

“…Lava flows and volcanoclastic lithologies are intercalated with each other in random order throughout the entire range of the Almus Group. Lava flows are represented by two different episodes, as depicted in stratigraphy and Ar-Ar ages (Göçmengil et al, 2017). The first episode contains two different subgroups: the primary subgroup contains basaltic andesite, andesite, dacitic lava flows and is generally situated at the lower levels of the Almus Group.…”

Section: Geological Features Of the Study Areamentioning

confidence: 99%

“…EC-AFC modeling is a more convenient tool compared to the other approaches because it also includes thermodynamic and physicochemical parameters, which are largely ignored by the bivariate plot-based approaches. We used Sr-Nd isotopic data from our three trachytic lavas together with basaltic trachyandesitic lava as a starting composition from the first-episode lava series in our own dataset (Figure 15b; Göçmengil et al, 2017). We made several attempts with different possible assimilants such as metamorphic units from the IAESZ and the Tokat Massif to better evaluate the assimilation processes with different temperatures (300, 400, 600 °C).…”

Section: Petrological Modeling Of Differentiation Processesmentioning

confidence: 99%

“…Thermal parameters and compositional values used for the EA-AFC modeling. Initial Sr-Nd isotopic values are taken from Göçmengil et al (2017). Assimilant values are taken from Köksal et al (2013), which are analogous to upper crustal rock units in the CACC.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

“…During the later stages of these extensions, metasomatized lithospheric mantle became thinned and started to partially melt, giving rise to voluminous Middle Eocene magmatism along both sides of the suture zone (Figures 16a and 16b; Yilmaz et al, 1997a;Keskin et al, 2008). The first episode of Middle Eocene magmatism is represented by the basic to intermediate volcanic products along the both the Almus and Yıldızeli regions (Figure 16a; Göçmengil et al, 2017). During the generation of the first episode, basaltic-trachyandesitic magma mush also developed along a regional scale, which acted later as parental magma chambers for the trachytic volcanism for both areas.…”

Section: Thermal Parametersmentioning

confidence: 99%

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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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Section: Thermal Parameterssupporting

confidence: 64%

Section: Geological Features Of the Study Areamentioning

confidence: 99%

Section: Petrological Modeling Of Differentiation Processesmentioning

confidence: 99%

Section: Geodynamic Implicationsmentioning

confidence: 99%