Investigation of the paleodepositional environment of the middle Miocene aged organic matter rich rocks (Tavas/Denizli/SW Turkey) by using biomarker parameters and stable isotope compositions (¹³C and ¹⁵N)

Indexed In

Volume 164 / 2021

Authors:

Demet Banu KORALAY

Keywords:

Tavas (Denizli Basin), Organic Geochemistry, Biomarkers, Stable Isotopes (¹³C and ¹⁵N), Depositional Environment.

Abstract:

The study area is located 45 km south of Denizli. The purpose of this study is to identify the organic geochemical properties and paleo depositional environment of organic matter rich rocks from Tavas (Denizli/SW Turkey). For this purpose, total organic carbon (TOC, wt.%) and pyrolysis, n-alkane, isoprenoid,  sterane,  terpane  and  aromatic  hydrocarbon parameters  have  been investigated  of the studied  samples.  In  addition,  scanning electron  microscopy  (SEM)  and stable  isotope  (δ¹³C and δ¹⁵N) investigations were also carried out. Organic matter rich rocks which have type III kerogen have got 25.80 and 44.00 wt.% TOC content. Hydrogen index (HI, 73 and 120 mg HC/g TOC) and Oxygen index (OI, 34 and 59 mg CO /g TOC) values of samples are very low. The values of δ¹³C and δ¹⁵N show the terrestrial C3 ecosystem. The predominance of high molecular weight n-alkanes, degree  of waxiness  and  less  dibenzothiophene  (DBT)  concentrations indicate  terrestrial  organic matter. At the same time, biomarker and pyrolysis parameters indicate that the organic matter rich rocks (Tavas/Denizli) are in the immature stage. Pr/Ph, C  /C homohopane biomarker ratios and C35

https://doi.org/10.19111/bulletinofmre.742127

DOI:

https://doi.org//10.19111/bulletinofmre.742127