Early abyssal- and late SSZ-type vestiges of the Rheic oceanic mantle in the Variscan basement of the Sakarya Zone, NE Turkey: Implications for the sense of subduction and opening of the Paleotethys

Dokuz A., UYSAL İ., Kaliwoda M., Karsli O., Ottley C. J., Kandemir R.

LITHOS, cilt.127, ss.176-191, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 127
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.lithos.2011.08.015
  • Dergi Adı: LITHOS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.176-191
  • Anahtar Kelimeler: Variscan oceanic peridotites, Rheic ocean, Paleoreconstruction, Paleotethys, Sakarya Zone, SPINEL PERIDOTITE XENOLITHS, EASTERN TAURIDES TURKEY, NORTHERN APPALACHIANS, TECTONIC EVOLUTION, KARAKAYA COMPLEX, MELT EXTRACTION, TRACE-ELEMENT, GEOLOGICAL CONSTRAINTS, GONDWANAN TERRANES, WESTERN PONTIDES
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

The boundary between the Gondwana and Laurussia, or a terrane separated from it, is traced by a suture recording the closure of the Rheic ocean in the Pulur, Beycam and Kurtoglu areas of the eastern Sakarya Zone of Turkey. Pulur lherzolite has a lower Cr# [100Cr/(Cr + Al) = 5-37] of the spinet and slightly enriched flat medium-heavy rare earth element (M-HREE) whole-rock pattern typical for those of the fertile abyssal-type lherzolite. By contrast, the Beycam harzburgite displays the mineralogical and geochemical features of a moderately depleted residue at a supra subduction zone (SSZ). Some of spinels from the Beycam peridotites show TiO2 contents (0.15-0.48 wt.%) identical to a later interaction with a melt of island-arc tholeiite (IAT) composition. Meta-basalt from the Beycam area is the representative of such a melt and displays the whole-rock M-HREE pattern of a complementary product of the Beycam harzburgite.