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Mineralogy and Petrology

, Volume 96, Issue 3–4, pp 177–196 | Cite as

Lutetian arc-type magmatism along the southern Eurasian margin: New U-Pb LA-ICPMS and whole-rock geochemical data from Marmara Island, NW Turkey

  • P. Ayda Ustaömer
  • Timur Ustaömer
  • Alan S. Collins
  • Jörg Reischpeitsch
Original Paper

Abstract

The rocks of Turkey, Greece and Syria preserve evidence for the destruction of Tethys, the construction of much of the continental crust of the region and the formation of the Tauride orogenic belt. These events occurred between the Late Cretaceous and Miocene, but the detailed evolution of the southern Eurasian margin during this period of progressive continental accretion is largely unknown. Marmara Island is a basement high lying at a key location in the Cenozoic Turkish tectonic collage, with a Palaeogene suture zone to the south and a deep Eocene sedimentary basin to the north. North-dipping metamorphic thrust sheets make up the island and are interlayered with a major metagranitoid intrusion. We have dated the intrusion by Laser Ablation ICP-MS analysis of U and Pb isotopes on zircon separates to 47.6 ± 2 Ma. We also performed major- and trace-elemental geochemical analysis of 16 samples of the intrusion that revealed that the intrusion is a calc-alkaline, metaluminous granitoid, marked by Nb depletion relative to LREE and LIL-element enrichment when compared to ocean ridge granite (ORG). We interpret the metagranitoid sill as a member of a mid-Eocene magmatic arc, forming a 30 km wide and more than 200 km long arcuate belt in NW Turkey that post-dates suturing along the İzmir-Ankara-Erzincan Suture zone. The arc magmatism was emplaced at the early stages of mountain building, related to collision of Eurasia with the Menderes-Taurus Platform in early Eocene times. Orogenesis and magmatism loaded the crust to the north creating coeval upward-deepening marine basins partially filled by volcanoclastic sediments.

Keywords

Eocene Mylonitic Foliation Menderes Massif Slab Breakoff Plutonic Belt 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgement

This study was partly supported by a TÜBİTAK (The Scientific and Technical Research Council of Turkey) grant to P.A.U. (TÜBİTAK post-doctoral overseas research grant). The authors would like to thank John Stanley, David Bruce, Justin Payne and Ben Wade from the University of Adelaide for their help during the laboratory studies. Mineral Research and Exploration Institute in Ankara is greatly appreciated for preparation of thin sections. We are also grateful to Mehmet Keskin of Istanbul University for his suggestions on geochemistry section and to Tolga Görüm of Yıldız Technical University for his assistance in drafting some of the figures. Constructive and helpful reviews, provided by Gernold Zulauf, Aral Okay and A. Möller are greatly acknowledged.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • P. Ayda Ustaömer
    • 1
  • Timur Ustaömer
    • 2
  • Alan S. Collins
    • 3
  • Jörg Reischpeitsch
    • 4
  1. 1.Doğa Bilimleri Araştırma MerkeziYıldız Teknik ÜniversitesiBeşiktaş-IstanbulTurkey
  2. 2.Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümüİstanbul ÜniversitesiAvcılar-IstanbulTurkey
  3. 3.Tectonics and Resources Exploration (TREX), School of Earth and Environmental SciencesUniversity of AdelaideAdelaideAustralia
  4. 4.Department of GeologyUniversity of HamburgHamburgGermany

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