Determining of Dolomitization Age and Depth of Mardin Group Based on Clumped Isotopes and 1D Basin Model in SE Anatolia (SE Turkey) Güneydoğu Anadolu Bölgesi Mardin Grubu Dolomitlerinin Dolomitleşme Yaşlarının ve Derinliklerinin Kümelenmiş İzotoplar ve 1B Basen Modeli Kullanılarak Belirlenmesi

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Atasoy D., Büyükutku A., GEÇER A., Aktosun A.

Yerbilimleri/ Earth Sciences, cilt.43, sa.3, ss.212-238, 2022 (Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 3
  • Basım Tarihi: 2022
  • Doi Numarası: 10.17824/yerbilimleri.1095003
  • Dergi Adı: Yerbilimleri/ Earth Sciences
  • Derginin Tarandığı İndeksler: Scopus, Aquatic Science & Fisheries Abstracts (ASFA), Geobase, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.212-238
  • Anahtar Kelimeler: Basin Model, Clumped Isotopes, Dolomite, Dolomitization, Mardin Group, Stable Isotopes, Trace Elements
  • Ankara Üniversitesi Adresli: Evet

Özet

The widespread Cretaceous aged Mardin Group is shallow marine carbonates and is the most proliferous section in SE Anatolia (SE Turkey). Clumped isotope temperatures were measured for Mardin dolomites between 92oC and 125oC. Using 1D basin model, clumped isotopes temperatures were converted to a depth and time for dolomitization from 2200 m (22 Ma-Early Miocene) to 3420 m (14 Ma-Middle Miocene). While low Fe and Mn concentration reflects marine fluids as a dolomitizing water, Sr values less than 200 ppm shows existence of late diagenesis. Both the range of paleotemperature and burial depth reflects different degree of recrystalization event as a result of burial event. The oxygen isotopic composition of dolomitizing fluid varied between 3.32% and 6.31% which is isotopically heavier than Cretaceous marine waters. The results indicates that late dolomitization are present in the study area and that a deeply buried dolomitizing pore fluid with high T has a negative influence on porosity system of the Mardin Group Reservoir.