Alpine ophiolite obduction before 110 ± 5 Ma ago, Taurus belt, eastern central Turkey

Zeck, H. P.; Ünlü, Taner

doi:10.1016/0040-1951(88)90315-0

Cited by 22 publications

(10 citation statements)

References 8 publications

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“…[] are similar to 40 Ar/ 39 Ar ages of 60–65 Ma reported by the same authors [ Özdamar et al ., ]. The first radiometric age constraints for the metamorphism and magmatism of the Kırşehir Block were also derived from K‐Ar and Rb‐Sr dating techniques on whole‐rock samples or mineral separates [e.g., Göncüoğlu , ; Zeck and Ünlü , ; Güleç , ; Yalınız et al ., ; İlbeyli , ; Tatar and Boztuǧ , ; Boztuğ and Harlavan , ]. These ages, interpreted to reflect granitoid intrusion and/or cooling of the Kırşehir Block during exhumation, are generally in the same ranges as the more modern, higher precision 40 Ar/ 39 Ar and U/Pb ages that are compiled in Table and Figure .…”

Section: Review Of Geochronological Constraints On Central Anatolian mentioning

confidence: 91%

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

et al. 2016

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In Central and Western Anatolia two continent-derived massifs simultaneously underthrusted an oceanic lithosphere in the Cretaceous and ended up with very contrasting metamorphic grades: high pressure, low temperature in the Tavşanlı zone and the low pressure, high temperature in the Kırşehir Block. To assess why, we reconstruct the Cretaceous paleogeography and plate configuration of Central Anatolia using structural, metamorphic, and geochronological constraints and Africa-Europe plate reconstructions. We review and provide new 40 Ar/ 39 Ar and U/Pb ages from Central Anatolian metamorphic and magmatic rocks and ophiolites and show new paleomagnetic data on the paleo-ridge orientation in a Central Anatolian Ophiolite. Intraoceanic subduction that formed within the Neotethys around 100-90 Ma along connected N-S and E-W striking segments was followed by overriding oceanic plate extension. Already during suprasubduction zone ocean spreading, continental subduction started. We show that the complex geology of central and southern Turkey can at first order be explained by a foreland-propagating thrusting of upper crustal nappes derived from a downgoing, dominantly continental lithosphere: the Kırşehir Block and Tavşanlı zone accreted around 85 Ma, the Afyon zone around 65 Ma, and Taurides accretion continued until after the middle Eocene. We find no argument for Late Cretaceous subduction initiation within a conceptual "Inner Tauride Ocean" between the Kırşehir Block and the Afyon zone as widely inferred. We propose that the major contrast in metamorphic grade between the Kırşehir Block and the Tavşanlı zone primarily results from a major contrast in subduction obliquity and the associated burial rates, higher temperature being reached upon higher subduction obliquity.

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Section: Review Of Geochronological Constraints On Central Anatolian mentioning

confidence: 91%

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

et al. 2016

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“…In conclusion, the K-Ar cooling ages of the felsic and mafic A-type granitoids from both the Murmana pluton and the Dumluca batholith of the Divrigi, SE Sivas area of east-central Anatolia confirm the existence of coeval felsic and mafic magma sources during the solidification of these bi-modal, A-type intrusions as already suggested by Boztug et al (1997Boztug et al ( , 2007b on the basis of field, textural and mineralogical-geochemical data. On the other hand, such Late Cretaceous hornblende and biotite K-Ar cooling ages for the Murmana pluton are not in agreement with the Rb-Sr whole-rock isochron of Zeck and Ü nlü (1988), which yielded an age of 110 ± 5 Ma for this pluton (see Figs. 1, 2; Table 2).…”

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

confidence: 55%

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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“…1), are within the error range of the Rb-Sr wholerock isochron ages of the I-type Agaçö ren intrusive suite in central Anatolia (Gü leç, 1994: 110 ± 14 Ma), and the bimodal A-type granites of the Divrigi-Sivas region in eastcentral Anatolia (Zeck and Ü nlü , 1988: 110 ± 5 Ma), (Figs. 1 and 2; Tables 2 and 4).…”

Section: Cenomanian-turonian Granitoidsmentioning

confidence: 82%

“…Similarly, their hornblende and biotite K-Ar cooling ages are very similar to each Boztug et al, 2003;; the lower-left inset after Bozkurt and Mittwede (2001); CACC -Central Anatolian Crystalline Complex. Zeck and Ü nlü (1988), Boztug et al (1997Boztug et al ( , 2007b, Boztug (1998Boztug ( , 2000 Dumluca, Murmana Mafic, feldspathoid bearing silica undersaturated alkaline rocks (ALKUS) Zeck and Ü nlü (1988), Boztug et al (1997Boztug et al ( , 2007b, Boztug (1998Boztug ( , 2000 I-type Ç altı, Bizmis ßen Eocene Intruding the central Anatolian ophiolite; unconformably covered by the Mio-Pliocene lacustrine sediments Low-to medium-K, calc-alkaline Boztug (1993), Ö nal et al (2005) other and range from ca. 80 to 65 Ma (Boztug and Harlavan, 2007).…”

Section: Literature On the Classification And Age Of The Central Anatmentioning

confidence: 97%

“…Geothermochronological age determinations carried out to-date on some of these granitoids are given in Table 2, with techniques classified into three groups: (1) intrusion or emplacement ages obtained by high-T geochronological methods, such as whole-rock Rb-Sr isochrons (Ataman, 1972;Kalkancı, 1974;Gö ncü oglu, 1986;Zeck and Ü nlü , 1988;Gü leç, 1994), zircon U-Pb SHRIMP (Whitney et al, 2003), and titanite U-Pb TIMS (Kö ksal et al, 2004); (2) medium-T geochronology data, comprising amphibole/biotite K-Ar cooling ages (Göncü oglu, 1986;Yalınız et al, 1999;_ Ilbeyli et al, 2004;Tatar and Boztug, 2005;Ö nal et al, 2005;Boztug and Harlavan, 2007) and amphibole/biotite Ar-Ar cooling ages (Whitney et al, 2003;Kadıoglu et al, 2003); and (3) exhumation ages based on low-T geothermochronological results, consisting of apatite fission-track analyses (Fayon et al, 2001;Boztug and Jonckheere, 2007). In summary, intrusion ages vary from 110 ± 14 Ma to 70.5 ± 3.4 Ma for the Cretaceous granitoids of central Anatolia.…”

Section: Literature On the Classification And Age Of The Central Anatmentioning

confidence: 99%

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207Pb–206Pb single-zircon evaporation ages of some granitoid rocks reveal continent-oceanic island arc collision during the Cretaceous geodynamic evolution of the central Anatolian crust, Turkey

Boztuğ

Tichomirowa

Bombach

2007

Journal of Asian Earth Sciences

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Alpine ophiolite obduction before 110 ± 5 Ma ago, Taurus belt, eastern central Turkey

Cited by 22 publications

References 8 publications

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

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

207Pb–206Pb single-zircon evaporation ages of some granitoid rocks reveal continent-oceanic island arc collision during the Cretaceous geodynamic evolution of the central Anatolian crust, Turkey

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