TitaniQ Thermometer and Trace Element Composition of Rutile in Meta-Ophiolitic Rocks From the Kazdag Massif, Biga Peninsula


ŞENGÜN F.

TURKIYE JEOLOJI BULTENI-GEOLOGICAL BULLETIN OF TURKEY, cilt.59, ss.131-154, 2016 (ESCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 59 Konu: 2
  • Basım Tarihi: 2016
  • Dergi Adı: TURKIYE JEOLOJI BULTENI-GEOLOGICAL BULLETIN OF TURKEY
  • Sayfa Sayıları: ss.131-154

Özet

Ophiolitic meta-gabbros are exposed on the Kazdag Massif located in the southern part of the Biga Peninsula. Trace element composition of rutile and quartz was determined for metagabbros from the Kazdag Massif by LA-ICP-MS. The Zr content of both matrix rutiles and rutile inclusions in garnet range from 176 to 428 ppm (average 335 ppm). Rutile grains usually have a homogeneous Zr distribution. The rutile grains from studied samples in the Kazdag Massif are dominated by subchondritic Nb/Ta (11-23) and Zr/Hf ratios (20-33). Nb/Ta and Zr/Hf show positive correlation, which is probably produced by silicate fractionation. The Nb/Ta and Zr/Hf ratios increase with a decrease in Ta and Hf contents. The core of rutile grains are generally characterized by low Nb/Ta ratios of 17-18 whereas the rims exhibit relatively high Nb/Ta ratios of 19-23. Trace element analyses in rutile suggest that these rutile grains were grown from metamorphic fluids.