Late Paleocene – Middle Eocene magmatic flare-up in western Anatolia

Okay, Aral I.; Topuz, Gültekın; Kylander-Clark, Andrew R.C.; Sherlock, Sarah C.; Zattin, Massımılıano

doi:10.1016/j.lithos.2022.106816

Cited by 4 publications

(3 citation statements)

References 106 publications

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“…The Sisdağı Pluton (41 Ma, Karslı et al 2012), Erik Granitoid (42 Ma, Sipahi et al 2017), Kaletaş Pluton (44 Ma; Arslan & Aslan, 2006), Karadağ Diorite (44 Ma, Sipahi et al 2022) and Bayburt Plutons (44–45 Ma; Eyüboğlu et al 2017) are some other examples of this group in the surrounding region. Interestingly, while the Eocene magmatic activity in northwest Anatolia is mostly between 54 and 45 Ma (Okay et al 2022), there is a significant number of the plutonic activities in the Sakarya Zone ranging in age predominantly from 46 to 36 Ma (Fig. 11).…”

Section: Discussionmentioning

confidence: 99%

“…Considering that the region had a magmatic arc position in the Late Cretaceous and evolved into a syn to post-collisional setting in the Eocene, precise determination of the ages of the igneous rocks is of great importance. This discrimination becomes much more important when considering that the Late Cretaceous plutonic bodies were intruded later by magmas of the middle Eocene plutonic bodies in the inner-arc setting (Dokuz et al Interestingly, while the Eocene magmatic activity in northwest Anatolia is mostly between 54 and 45 Ma (Okay et al 2022), there is a significant number of the plutonic activities in the Sakarya Zone ranging in age predominantly from 46 to 36 Ma (Fig. 11).…”

Section: A Age Of the Plutonmentioning

confidence: 99%

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The Sr, Nd, Pb and Hf isotopes and crystallization conditions of the middle Eocene Dağdibi Pluton in the eastern Sakarya Zone, Turkey

Sipahi,

Gücer,

Dokuz

et al. 2023

Geol. Mag.

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Magmatic activity in the Sakarya Zone, an important segment of the Alpine orogenic belt, continues intermittently from the middle Carboniferous to Miocene. In this study, we provide geochronological and geochemical data from the Dağdibi Pluton in the eastern Sakarya Zone to present some inferences on the source region and petrogenesis of the middle Eocene magmatism. U–Pb zircon geochronology from two granodiorite samples gives middle Eocene ages of 44.75 ± 0.92 and 45.01 ± 0.59 Ma. The pluton is mainly composed of K-feldspar, plagioclase, quartz, Mg-hornblende/actinolite, Fe–Ti oxides and small amounts of biotite, and secondary chlorite and epidote. Parental magma of the intrusive rocks has a high-K calc-alkaline affinity with metaluminous character. The oxygen fugacity values vary between −18 and −17. The rocks show slightly radiogenic 87Sr/86Sr(i) (0.704845–0.705726) ratios and ϵNdi values between −0.96 and +0.52. Pb–Pb isotope ratios are typical for those of the lower continental crust. ϵHf(i) values of the zircons range from 0.14 to 10.26. The geochemical and isotopic features of the pluton point to a parental magma derived from a depleted mantle that was metasomatized by fluids during previous subduction events. The volumetric abundances of the rock types are decreased as the silica content increase, implying that the fractional crystallization is the most important process during the formation of the present compositional range of the pluton. Amphibole, plagioclase and Fe–Ti oxides are the fractionated phases while K-feldspar is largely accumulated. In the light of the data presented above, slab breakoff is regarded as the geodynamic process responsible for the formation of the Dağdibi Pluton in the middle Eocene.

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Section: Discussionmentioning

confidence: 99%

Section: A Age Of the Plutonmentioning

confidence: 99%

The Sr, Nd, Pb and Hf isotopes and crystallization conditions of the middle Eocene Dağdibi Pluton in the eastern Sakarya Zone, Turkey

Sipahi,

Gücer,

Dokuz

et al. 2023

Geol. Mag.

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“…The Cenozoic ductile shear zones described in the Eocene granites from the Marmara Island from the northern margin of the Kapıdağ peninsula (Figure 2) could represent segments of this sinistral fault (Figure 2). Both of these granites have middle Eocene (48–47 Ma) crystallization (Okay et al., 2022) and Oligocene (33 and 27 Ma) AFT ages (Zattin et al., 2010). The shear zone on the northern margin of the Kapıdağ peninsula is described either as sinistral (Aksoy, 1998) or dextral (Türkoğlu et al., 2016).…”

Section: Rotational Mode Of Opening Of the Thrace Basinmentioning

confidence: 99%

Thrace Basin—An Oligocene Clastic Basin Formed During the Exhumation of the Rhodope Complex

Okay,

Özcan,

Siyako

et al. 2023

Tectonics

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Some orogenic sedimentary basins are difficult to assign to a particular category. An example is the hydrocarbon‐bearing Thrace Basin in the northern Aegean. It has more than 9‐km‐thick Cenozoic clastic sediment, and is spatially associated with the Rhodope metamorphic core complex in the west, and with the Tethyan subduction‐accretion complexes in the south, and is cut by the North Anatolian Fault and its precursors. It has been interpreted variously as an intramontane, a forearc, or an orogenic collapse basin. Here, we provide new geochronological and biostratigraphic data to constrain the tectonic evolution of the Thrace Basin. The new data indicate that as an individual depocenter the Thrace Basin has a short age span (late Eocene—Oligocene, 36–28 Ma) and more than 90% of the basin fill consists of early Oligocene (34–28 Ma) siliciclastic turbidites, deposited at rates of 1.0 km/my. Paleocurrents and new detrital zircon U‐Pb ages show that the Rhodope Complex was the main sediment source. The exhumation of the northern Rhodope Complex (36–28 Ma) was coeval with the main subsidence in the Thrace Basin (34–28 Ma), and involved clockwise crustal rotation in the northern Aegean and possibly crustal flow from underneath the Thrace Basin. Crustal rotation is indicated by the paleomagnetic data, regional stretching lineations in the Rhodope Complex, and the triangular shape of the Thrace Basin. The rotating crustal block must have been bounded in the south by a sinistral fault zone; the location of which corresponds largely with the present day North Anatolian Fault.

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Geochemical constraints on Eocene ignimbrite flare-up in the Urumieh-Dokhtar magmatic arc, northwestern Iran

Fazlnia

Pang

et al. 2023

Lithos

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Late Paleocene – Middle Eocene magmatic flare-up in western Anatolia

Cited by 4 publications

References 106 publications

The Sr, Nd, Pb and Hf isotopes and crystallization conditions of the middle Eocene Dağdibi Pluton in the eastern Sakarya Zone, Turkey

The Sr, Nd, Pb and Hf isotopes and crystallization conditions of the middle Eocene Dağdibi Pluton in the eastern Sakarya Zone, Turkey

Thrace Basin—An Oligocene Clastic Basin Formed During the Exhumation of the Rhodope Complex

Geochemical constraints on Eocene ignimbrite flare-up in the Urumieh-Dokhtar magmatic arc, northwestern Iran

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