Abstract
Eocene organic-rich sediments are widespread in the Amasya region of north-central Turkey and have been studied in outcrop. Detailed data from thick Eocene sediments (Derealan Formation) made it possible to construct an organic-facies framework using different zonations. Organic matter is composed predominantly of autochthonous algal and amorphous material, with a minor contribution of allochthonous terrestrial material. Kerogen in the deposits is primarily Type I, as indicated by organic petrographic observations and Rock-Eval data. Total organic-carbon content (TOC) of this deposit decreases from over 54% in limestone and shale to less than 2% in the other deposits of the Derealan Formation. Tmax values vary between 441 ° and 456° C, confirming the increase in maturation trends indicated by vitrinite reflectance data. Both organic petrographic and geochemical maturation parameters place the Eocene sediments of the Northern Gumushacikoy (Amasya) region within the B organic facies. According to the organi...
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