Geochemistry of the organic matter of Ulug-Khem Basin coals
Geochemistry of the organic matter of Ulug-Khem Basin coals
Russian Geology and Geophysics (November 2021) 62 (11): 1229-1239
- aliphatic hydrocarbons
- alkanes
- Araucariaceae
- aromatic hydrocarbons
- Asia
- biomarkers
- chromatograms
- clastic rocks
- coal
- Commonwealth of Independent States
- conglomerate
- Coniferales
- geochemistry
- Gymnospermae
- hydrocarbons
- isoprenoids
- Jurassic
- kerogen
- Lycopsida
- mass spectra
- Mesozoic
- Middle Jurassic
- mudstone
- organic compounds
- paleoenvironment
- Pinaceae
- Plantae
- polycyclic aromatic hydrocarbons
- Pteridophyta
- Russian Federation
- sandstone
- sedimentary rocks
- siltstone
- spectra
- Spermatophyta
- Tuva Russian Federation
- vegetation
- vitrinite reflectance
- Kyzyl Russian Federation
- Ulug-Khem Basin
- Ulug Seam
- Erbek Formation
The composition of the organic matter (OM) of coals of the Ulug-Khem Basin has been studied. According to Rock-Eval pyrolysis data, this OM is a type III kerogen, sometimes significantly oxidized. The coal of low-grade metamorphism has a high hydrocarbon potential. Based on the gas-liquid chromatography and chromatography-mass spectrometry data on the distribution of n-alkanes, isoprenoids, polycyclic biomarkers, and aromatic hydrocarbons, we have established the composition of the primary OM of the coals and the grade of OM metamorphism. The primary OM of the coals consists mainly of remains of aquatic vegetation and terrigenous OM. The latter includes conifer remains, which are identified from the presence of 4beta (H)-19-norisopimarane in the aliphatic fraction of bitumen and from the domination of retene over cadalene and 6-isopropyl-1-isohexyl-2-methylnaphthalene in the aromatic fraction.
