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- Title
Petrographic and geochemical features of weathered and pyrolytic altered organic matter of dump samples from Troyanovo-3 Mine (Mini Maritsa Iztok EAD, Bulgaria) - a comparison.
- Authors
Misz-Kennan, Magdalena; Milakovska, Zlatka; Fabiańska, Monika J.; Więcław, Dariusz; Stefanova, Maya; Vladislavov, Georgi
- Abstract
The open-pit exploitation of the Maritsa Iztok lignite field (Bulgaria) generated sedimentary waste rocks of low organic matter content that were deposited in internal dumps. Immediately after deposition the re-deposited sediments underwent weathering, including organic matter oxidation leading in some cases to self-heating. The aims of the research were to study the impact of weathering and self-heating on the maceral alterations in the dump site associated with the sediment re-deposition, and organic compounds identification and distribution. The 27 samples collected from Troyanovo-3 Mine internal dump differed in degree of alteration. The first group contained unaltered macerals and showed normal distribution of n-alkanes, phenols were absent and Rock-Eval Tmax ranged from 420 to 430 °C. The second group contained macerals with irregular cracks, paler oxidation rims, higher reflectance, Gaussian distribution of n-alkanes, high concentration of phenols and PAHs, and lowered Tmax values (below 400 °C). The samples contained elevated amount of pyrite which oxidation might contribute to self-hating.
- Subjects
SEDIMENTARY rocks; MACERAL; GAUSSIAN distribution; LIGNITE; ORGANIC compounds
- Publication
Review of the Bulgarian Geological Society, 2024, Vol 85, Issue 1, p101
- ISSN
0007-3938
- Publication type
Article
- DOI
10.52215/rev.bgs.2024.85.1.101