William CAVAZZA, Ilaria FEDERICI, Olivier BEYSSAC, Massimiliano ZATTING, Sveva CORRADO, Francesco DELLISANTI, Aral l. OKAY

Thermal evolution of the permo−triassic Karakaya subduction-accretion complex between the Biga Peninsula and the Tokat Massif (Anatolia)

Bu çalışmada değişik analitik yöntemler (kil mineralojisi, vitrinit yansıması, karbonca zengin malzemenin Raman spektrometresi) kullanılarak Paleo-Tetis'in kapanması sürecinde oluşan, Permo−Triyas yaşındaki bir dalmabatma- eklenme birimini temsil eden Karakaya Kompleksi’nin termal evrimi araştırılmıştır. Karakaya Kompleksi üzerinde uyumsuzlukla yer alan, kuvvetli deformasyon veya gömülme yaşamamış Liyas yaşlı sığ denizel silisiklastik ve karbonat kayaları, Karakaya Kompleksi'nin termal evriminin büyük ölçüde Permo−Triyas yaşlı dalma-batma süreçlerine bağlı olduğunu ve daha sonraki Alpin olaylardan fazla etkilenmediğini göstermektedir. Metabazitlerden ve daha az oranlarda mermer ve fillattan oluşan Alt Karakaya Kompleksi 340 ile 497°C arasında değişen maksimum sıcaklıklara ulaşmıştır. Daha önceki çalışmalarda metamorfik olmadığı veya çok düşük dereceli metamorfizma geçirdiği farz edilen, Üst Karakaya Kompleksi ise zeolit ve yeşilşist fasiyesinde (120−376°C) metamorfizma geçirmiştir. Bu çalışmanın sonuçları Raman termometresinin nispeten düşük sıcaklıkları (200−350°C) tanımlamakta büyük potansiyel taşıdığını göstermektedir.

Biga Yarımadası ile Tokat Masifi arasında permo−triyas yaşlı Karakaya dalma-batma-eklenme kompleksinin termal evrimi

The results of the combined application of a series of analytical methods (clay mineralogy, vitrinite reflectance, Raman microspectroscopy) placed tight constraints on the thermal evolution of the Karakaya Complex of northern Anatolia, a mostly Permo−Triassic subduction-accretion complex resulting from the progressive closure of the Palaeotethys. The thermal evolution of the Karakaya Complex is the result of Permian−Triassic subductionaccretion processes, and was not significantly affected by later Alpine-age tectonism, as shown by Liassic shallow-water siliciclastic and carbonate deposits overlying unconformably the Karakaya Complex which did not undergo any significant burial. The Lower Karakaya Complex, comprising metabasite and subordinate marble and phyllite, experienced maximum temperatures ranging from 340 to 497° C, in agreement with independently determined thermobarometric reconstructions. The entire Upper Karakaya Complex, previously considered unmetamorphosed or slightly metamorphosed, was affected by zeolite to lower greenschist facies metamorphism (120−376° C). The coherent results of this study show that Raman thermometry has great potential for palaeotemperature determination at low temperature ranges (200−350° C).

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