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Detrital zircon ages from a Lower Ordovician quartzite of the İstanbul exotic terrane (NW Turkey): evidence for Amazonian affinity

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An Erratum to this article was published on 07 April 2010

Abstract

NW Turkey is a mosaic of several continental and oceanic units, that were amalgamated by collisional and strike–slip tectonics. One of the continental units is the İstanbul terrane, the Palaeozoic strata of which comprise an Early Ordovician to Early Carboniferous transgressive sedimentary sequence. The basement to the Palaeozoic succession is exposed in the Bolu Massif and is represented by a thick meta-volcanic unit intruded by Late Neoproterozoic (ca. 575 Ma) felsic magma. This meta-igneous basement is considered to be a sliver of the Cadomian magmatic arc. Unconformably overlying Early Ordovician strata start with red fluvial clastics (ca. 3,000 m), overlain by shallow marine quartzites (<250 m). Detrital zircons were separated from an Ordovician quartzite sample located 5 m above the contact with the underlying red fluvial clastics. We have dated a total of 99 zircon grains by U–Pb method using laser ablation-sector field-inductively coupled plasma mass spectrometer (LA-SF-ICP-MS). The ages (97% are >90% concordant) range from 530 to 2550 Ma. The dominance (44 grains) of Neoproterozoic zircon ages (around 540, 570, 600–640 and 700–800 Ma) rules out any link of the İstanbul terrane with Baltica. The large amount (40 grains) of Grenvillian and Meso- to Palaeo-proterozoic ages (around 1.0–1.2, 1.3–1.6, 1.7–1.8, and 1.9–2.1 Ga) in the zircon population further rules out a link to Cadomian and Minoan terranes, but is indicative for Amazonian source areas. The new age data suggest the İstanbul terrane to be a peri-Gondwanan terrane that was located at the northwestern margin of Gondwana close to Amazonia. This terrane should have travelled a large distance in the Phanerozoic times.

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Acknowledgments

This study was partly supported by TÜBİTAK-DFG joint research programme grant (ZU/73/19-1) for P.A.U and also by the Yıldız Technical University Research Fund, Project No: 27-13-02-01. We greatly appreciate help of Dr. Dörr, Mrs. J. Schastock, Ms. A. Giribaldi and Mr. J. Heliosch during sample preparation. We would like to thank Mr. W. Schiller for his assistance during CL study. The paper benefited from the constructive reviews by F. Finger and W. Siebel.

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  1. Doğa Bilimleri Araştırma Merkezi, Yıldız Teknik Üniversitesi, Beşiktaş, 34349, Istanbul, Turkey

    Petek Ayda Ustaömer

  2. Mühendislik Fakültesi, İstanbul Üniversitesi, Jeoloji Bölümü, Avcılar, 34850, Istanbul, Turkey

    Timur Ustaömer

  3. Institut für Geowissenschaften, Goethe Universität, Altenhöferallee 1, 60438, Frankfurt am Main, Germany

    Axel Gerdes & Gernold Zulauf

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  1. Petek Ayda Ustaömer
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Correspondence to Petek Ayda Ustaömer.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00531-010-0539-9

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Ustaömer, P.A., Ustaömer, T., Gerdes, A. et al. Detrital zircon ages from a Lower Ordovician quartzite of the İstanbul exotic terrane (NW Turkey): evidence for Amazonian affinity. Int J Earth Sci (Geol Rundsch) 100, 23–41 (2011). https://doi.org/10.1007/s00531-009-0498-1

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