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Post-collisional plutonism with adakite-like signatures: the Eocene Saraycık granodiorite (Eastern Pontides, Turkey)

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Abstract

The post-collisional Saraycık granodiorite intruded into a late Paleocene to early Eocene nappe pile that formed during collision of the Pontides in the North and the Anatolide-Tauride platform in the South, leading to the formation of the İzmir-Ankara-Erzincan suture. A relatively shallow pluton intrusion depth (∼5 to 8 km) was estimated from Al-in-hornblende geobarometry and contact metamorphic assemblages. The emplacement age is tightly constrained to ∼52 Ma by two Ar–Ar plateau and total fusion ages on biotite. The main mass of the pluton consists of metaluminous to peraluminous biotite granodiorite and hornblende-biotite granodiorite. In addition, up to 10-m thick dacitic and <25-cm thick aplitic dikes occur. Granodiorites and dacites show many close compositional similarities to high-silica adakites from supra-subduction zone settings, but tend to be slightly more felsic and to have a higher aluminium saturation index. Chondrite-normalized (cn) rare earth element patterns are characterized by high ratios of (La/Yb)cn, concave-upward shapes of the HREE and a lack of significant Eu anomalies. In conjunction with relatively high abundances of Ba and Sr as well as low abundances of Y, HREE and Sc, these patterns suggest a feldspar-poor, garnet ± amphibole-rich fractionating mineral assemblage (residue). All samples have very similar Nd–Sr isotopic characteristics, regardless of rock type. Initial εNd values range from −0.3 to −1.2 and initial 87Sr/86Sr ratios from 0.70491 to 0.70529. It is suggested that the magmas formed by partial melting of mafic lower crust at elevated pressures (∼1 to 2 GPa).

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Acknowledgements

This paper benefited from constructive reviews by two anonymous referees, discussions with Aral I. Okay, Cüneyt Şen and Cemal Göncüoğlu, and from logistic support by Burhan Sadıklar. Special thanks are due to Ilona Fin and Oliver Wienand for preparing thin sections, Hans-Peter Meyer and Thomas Ludwig for their never-ending assistance during XRF and EPMA work, and Ömer Gündüz (†), Osman Nuri Albayrak and Canpulat Hatko for their help during sample preparation. Mutlu Sarıkaya and Özgür Parlak are thanked for their companionship during field work. We are also indebted to the people living in the Saraycık area for their great hospitality and friendliness.

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  1. Gültekin Topuz

    Present address: Eurasian Institute of Earth Sciences, Technical University of Istanbul (İTÜ), Ayazaga, 80626, Istanbul, Turkey

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  1. Department of Geology, Black Sea Technical University (KTÜ), TR-61080, Trabzon, Turkey

    Gültekin Topuz & Abdurrahman Dokuz

  2. Institute of Mineralogy, University of Heidelberg, Im Neuenheimer Feld 236, 69120, Heidelberg, Germany

    Rainer Altherr & Winfried H. Schwarz

  3. Institute of Geosciences (Geochemistry), University of Tübingen, Wilhelmstr. 56, 72074, Tübingen, Germany

    Wolfgang Siebel & Muharrem Satır

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Topuz, G., Altherr, R., Schwarz, W.H. et al. Post-collisional plutonism with adakite-like signatures: the Eocene Saraycık granodiorite (Eastern Pontides, Turkey). Contrib Mineral Petrol 150, 441–455 (2005). https://doi.org/10.1007/s00410-005-0022-y

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