Factors controlling the paleo-sedimentary conditions of Çeltek oil shale, Sorgun-Yozgat/Turkey

Yıl 2019, , 251 - 263, 25.04.2019

Berna Yavuz Pehlivanlı

https://doi.org/10.19111/bulletinofmre.494703

Cited By: 1

Öz

The study field covering
an area of about 1000 km2 is located in Sorgun town of the city of Yozgat. In the
region Paleozoic, Campanian-Maastrichtian, Eocene, Miocene and Quaternary units
are exposed. Among these units, the lower Eocene Çeltek formation hosts coal beds
and oil shale. The Eocene epoch is important for organic matter deposition regarding
oil and gas productivity and anoxic depositional conditions. In order to examine
the paleo-sedimentary conditions of oil shales in the study area and their relation
to Total Organic Carbon (TOC) contents and major-trace element contents, a total
of 29 samples were collected from two boreholes and one Measured Stratigraphic Section
(MSS). Samples have TOC contents varying from 1.97 to 16.17 wt% (average 6.30 wt%).
The V/Cr, V/(V+Ni), U/Th, δU and Authigenic Uranium (AU) values of the Çeltek formation
oil shales (ÇFOS) reveal that the oil shales have been deposited under variable
paleo-environmental conditions. For paleo-salinity the Sr/Ba ratios indicate mostly
deposition in a freshwater environment. Chemical Alteration Index (CIA) values and
Sr/ Cu ratios indicate that paleo-climate conditions of ÇFOS were dry, hot and occasionally
humid. The Fe/ Ti and (Fe+Mn)/Ti ratios reveal hydrothermal activity during sedimentation
of oil shales. Zr/Rb ratios of samples are indicative of very weak paleo-hydrodynamics
during the deposition of oil shales. Such variable geochemical conditions in the
basin resulted in variable paleo-environmental conditions.

Anahtar Kelimeler

Paleo-environment, paleo- salinity, paleo-climate, chemical alteration index (CIA), Çeltek formation oil shales (ÇFOS), total organic carbon (TOC)

Kaynakça

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