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ORGANIC GEOCHEMISTRY OF HUMIC ACIDS FROM A NEOGENE LIGNITE SAMPLE, BULGARIA

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ORGANIC GEOCHEMISTRY OF HUMIC ACIDS FROM A NEOGENE LIGNITE SAMPLE, BULGARIA (EN)
Marinov, S.P.
Stefanova, M.
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
2010-01-01
Humic substances naturally occur in Miocene/Pliocene-aged lignite at very high concentrations. Here biomarkers in the bitumen-free extract of humic acids from Thracian lignite, Bulgaria, are studied. Applying methods of organic geochemistry a broad range of compounds are isolated and characterised. Species are classified according to abundance, possible source input and diagenetic transformation. A feature of humic acids derived from Thracian coal is the extremely high content of 16α(H)Phyllocladane, ~60% of aliphatic fraction, or 1.6 wt.% of initial lignite. The high diterpenoids content, especially with abietane skeleton, proved the conifer contribution to the peat-forming helophytes, i.e. Cupressaceae s. str., Podocarpaceae, Araucariaceae, Taxodiaceae, Phyllocladus, Piceae. Tightly-trapped, linear long-chain fatty acids (FAs) are the main constituents of the acidic fraction of humic acids. Their distribution patterns indicate a dominant higher plant origin. The presence of αOH-FAs and hopanoid acids assumes bacterial activity in the plant material reworked. A hint for the input of plant biopolymers, i.e. cutin, suberin, is the relative high content of “even” carbon numbered ωΟΗFAs and α,ω-alkanedioic FAs. “Even” numbered short-chain ωΟΗFAs could originate from cutin-derived constituents of the needles of numerous species of gymnospermous families. (EN)
Thrace (EN)
humic acid (EN)
fatty acid (EN)
lignite (EN)
palaeoenvironment (EN)
biomarker (EN)
Δελτίο της Ελληνικής Γεωλογικής Εταιρίας
English
Geological Society of Greece (EN)
0438-9557
2529-1718
Δελτίο της Ελληνικής Γεωλογικής Εταιρείας; Τόμ. 43 Αρ. 5 (2010): 12o Διεθνές Συνέδριο της Ελληνικής Γεωλογικής Εταιρίας; 2398-2405 (EL)
Bulletin of the Geological Society of Greece; Vol. 43 No. 5 (2010): 12th International Conference of the G.S.G.; 2398-2405 (EN)
https://creativecommons.org/licenses/by-nc/4.0
Copyright (c) 2017 M. Stefanova, S.P. Marinov (EN)
Geological Society of Greece
Bulletin of the Geological Society of Greece
Geochemistry and Ore Deposit Geology



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