@conference{
author = "Zdravkov, Alexander and Gross, Doris and Bechtel, Achim and Stojanović, Ksenija and Kojić, Ivan",
year = "2023",
abstract = "Three 0.2-0.6 m thick coal seams, representing seam splits from a locally thicker seam (~1.8
m), comprise the Eocene Suhostrel coal deposit from the S-SW margin of the E1-2-Ol1 Padesh
Graben. High TOC contents (avg. ~86 wt.%, daf), VR (avg. Ro = 1.05%) and Tmax (avg. 457°C),
argue for high vol. A/medium vol. bituminous coalification rank. Maceral composition is
dominated by vitrinite (avg. ~ 95 vol.%), represented by detrovitrinite (e.g., collodetrinite, avg.
37.5 vol.%, and vitrodetrinite, avg. 19.2 vol.%) and collotelinite (avg. 38.0 vol.%, mostly
gelified leaf-derived tissues, e.g. phyllo-vitrinite). Liptinite (avg. ~5 vol.%) includes cutinite
and microsporinite. Predominance of mid- and long-chain n-alkanes argues for peat formation
from a mixture of aquatic macrophytes and terrestrial vascular plants. Low Vegetation Index
values (VI = 0.1-3.2, avg. 0.8; Calder et al., 1991) denote major organic matter contribution
from vegetation with poor preservation potential. This is compatible with the presence of
oleanane, confirming input from angiosperm plants. The absence of resin-derived sesqui- and
diterpenoid hydrocarbons argues for an insignificant role of conifers during peat formation.
Reconstructed depositional settings (Fig. 1) argue for organic matter deposition under marginal
aquatic, marsh/fen-type peatland with meso- to rheotrophic characteristics (Groundwater Index,
GWI = 0.3-7.2, avg. 1.4; Calder et al., 1991). High mineral matter contents (ash yields 21-47
wt.%) imply hydrologically active environment with frequent (perhaps seasonal) changes in Eh
settings. Low concentrations of hopanoid biomarkers imply limited aerobic degradation of the
plant remains. Post-depositional marine influence and downward infiltrating sulfate-rich waters
are considered responsible for the presence of dibenzothiophene and its methylated derivatives.",
publisher = "Geological Society of Greece",
journal = "Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece, Bulletin of the Geological Society Special Publication",
title = "Paleoenvironmental settings of peat formation within Padesh Graben, SW Bulgaria, deduced from maceral analysis and geochemical properties of Suhostrel Coal",
volume = "12",
pages = "53-53",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6402"
}
