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Paleoenvironmental significance of biomarker and stable isotope (2H, 13C, 15N, 18O, and 34S) investigations on a Pliocene coal-bearing sequence (Denizli Basin, southwestern Turkey)
Journal of African Earth Sciences ( IF 2.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jafrearsci.2020.103948
Demet Banu Koralay

Abstract Pliocene coal, clayey coal, and coaly claystone sediments from the Yatagan Formation (Denizli Basin, southwestern Turkey) have been investigated with respect to maceral association, mineralogical composition, n-alkane, isoprenoid and saturated-aromatic biomarker characteristics, and stable isotopes (2H, 13C, 15N, 18O, and 34S). The main purpose of the present study was to determine the hydrocarbon potential and paleodepositional conditions of coals in the Denizli Basin. The abundances of huminite, liptinite, and inertinite macerals were 46.14%, 8.06%, and 1.57%, respectively. The huminite/vitrinite reflectances (%Ro) of the coal, clayey coal, and coaly claystone samples ranged between 0.26 and 0.37 %Ro, implying sub-bituminous B and C coal ranks. The total organic C (TOC, wt.%) content and the Tmax values of the investigated samples ranged between 0.74 and 43.80 wt% and 390–440 °C, respectively. In addition, the coaly horizons were characterized by very low H index (HI), O index (OI), production index (PI), and Tmax values. Moreover, a high waxiness degree, C preference index (CPI), odd-to-even predominance (OEP), terrigenous/aquatic ratio (TAR), and high C19 tricyclic terpane/C23 tricyclic terpane (C19/C23 TT) and C24 tetracyclic terpane/C26 tricyclic terpane (C24*/C26 TT) biomarker ratios indicated a terrestrial plant input. These results were supported by stable isotope (2H, 13C, and 15N) investigations. Although the Pliocene coals have source rock potential according to the TOC content and pyrolysis analyses, they have been determined to be at the diagenesis and immature stages as a result of organic petrographic, and saturated-aromatic biomarker investigations.

中文翻译:

生物标志物和稳定同位素(2H、13C、15N、18O 和 34S)对上新世含煤层序(代尼兹利盆地,土耳其西南部)调查的古环境意义

摘要 对来自 Yatagan 组(土耳其西南部代尼兹利盆地)的上新世煤、粘土煤和煤质粘土岩沉积物的微晶组合、矿物组成、正烷烃、类异戊二烯和饱和芳香族生物标志物特征以及稳定同位素进行了研究。 2H、13C、15N、18O 和 34S)。本研究的主要目的是确定代尼兹利盆地煤的油气潜力和古沉积条件。腐殖质、锂铁质和惰性质的丰度分别为 46.14%、8.06% 和 1.57%。煤、粘土煤和煤质粘土样品的腐殖质/镜质体反射率 (%Ro) 介于 0.26 和 0.37%Ro 之间,这意味着亚烟煤 B 和 C 级。总有机碳 (TOC, wt. %) 含量和所研究样品的 Tmax 值分别介于 0.74 和 43.80 重量%和 390-440°C 之间。此外,煤层的特征是非常低的 H 指数 (HI)、O 指数 (OI)、生产指数 (PI) 和 Tmax 值。此外,高蜡度、C 偏好指数 (CPI)、奇偶优势 (OEP)、陆源/水生比 (TAR) 和高 C19 三环萜烷/C23 三环萜烷 (C19/C23 TT) 和 C24 四环萜烷/C26 三环萜烷 (C24*/C26 TT) 生物标志物比率表明陆生植物输入。这些结果得到了稳定同位素(2H、13C 和 15N)研究的支持。尽管根据 TOC 含量和热解分析,上新世煤具有烃源岩潜力,但由于有机岩相学,它们已被确定处于成岩和未成熟阶段,
更新日期:2020-11-01
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