Organic geochemistry of Amynteo lignite deposit,northern Greece: a Multi-analytical approach |
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| Authors: | Andreas Iordanidis Jan Schwarzbauer Andreas Georgakopoulos Barend van Lagen |
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| Institution: | 1.Department of Geotechnology and Environmental Engineering,Technological Educational Institute (TEI) of West Macedonia, Kila,Kozani,Greece;2.Institute of Geology and Geochemistry of Petroleum and Coal,RWTH Aachen University,Aachen,Germany;3.Department of Mineralogy-Petrology-Economic Geology, School of Geology,Aristotle University of Thessaloniki,Thessaloniki,Greece;4.Laboratoty of Organic Chemistry,Wageningen University,Wageningen,The Netherlands |
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| Abstract: | Several lignite samples were collected from boreholes of the Amynteo opencast lignite mine, northern Greece. Organic geochemical
characteristics were investigated with the help of various analytical techniques, comprising Gas Chromatography (GC) and Gas-chromatography-Mass
Spectrometry (GC-MS), Fourier Transform Infrared Spectroscopy (FTIR), solid-state Nuclear Magnetic Resonance (NMR) and Electron
Paramagnetic Resonance (EPR) spectroscopy, petrographical measurements as well as determination of bulk parameters. In the
low rank (Rr = 0.21%) Amynteo lignites, huminite is the most abundant maceral group, inertinite has relatively low percentages
and liptinite concentrations are rather high. Carbon Preference Index (CPI) reveals the predominance of odd-numbered, long-chained
aliphatic hydro-carbons, which is related to a higher terrestrial plant input. The Pr/Ph ratio suggests that reducing conditions
were persistent during peatification. Gymnosperm biomarkers such as isoprimarane, abietane, phyllocladane and sandaracopimarane,
as well as angiosperm indicators (lupane) and hopanoid compounds with bacterial origin were identified. Analyses of the aromatic
fractions revealed the presence of naphthalene, alkyl benzenes and phenols, pyrene, cadalene, cadinane, fluoranthene and dibenzofurane.
Based on the FTIR analysis, aliphatic and oxygen containing structures were prevailed over the aromatic moieties. The intensity
of the mineral bands was preferentially increased in the FTIR spectra of insoluble material. According to NMR analysis, the
aliphatic carbons (0–50 ppm) have higher proportions comparing to aromatic carbons (100–160 ppm). The aromaticity fraction
is low (fa = 0.32), as expected for these low rank coals. The presence of free organic radicals and Fe3+ and Mn2+ paramagnetic ions was revealed by EPR. In summary, the combined application of complementary analytical techniques allowed
a deep inside into the geochemical characteristics of Amynteo lignites. |
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