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Biodegraded bitumens dispersed in Vendian (Neoproterozoic) rocks of the Khatyspyt Formation, Northeastern Siberia

D.S. Melnik, T.M. Parfenova, V.I. Rogov

Original article

DOI https://doi.org/10.18599/grs.2020.2.37-44

37-44
rus.
eng.

open access

Under a Creative Commons license

The organic matter of the Vendian (Neoproterozoic) Khatyspyt Formation was investigated. The new data obtained from the GC and GC-MS analyses include: high UCM humps and heightened peaks of steranes and terpanes against the backdrop of C27+ alkanes on chromatograms of saturated hydrocarbons fractions of five samples; predominance of С21-С26 in n-alkanes distribution; the presence of 12- and 13-monomethylalkanes on chromatograms and demethylated terpanes on filtered chromatograms (m/z 191 and 177). Besides, dispersed bitumens with biodegraded hydrocarbons have been for the first time identified in carbonate and carbonate-siliceous rocks of the Khatyspyt Formation. Also 8,14-sekohopanes resistant to biodegradation and gammacerane were established.

The revealed features of the composition and distribution of hydrocarbons showed that their source was the autochthonous (syngenetic) organic matter of the Khatyspyt Formation, one of the potential hydrocarbon source rock of Northeastern Siberia. The composition and content of bitumen are found to be controlled by the inputs of primary organisms (eukaryotes and prokaryotes) which lived in Vendian seas, by changing redox conditions of sediment deposition and transformation, as well as by relatively little effect of temperature and high degree of biological oxidation in hypergenesis.

The patterns of bitumen distribution throughout the section show, that besides the overlying deposits, their accumulations can be discovered in the Khatyspyt Formation.

 

organic geochemistry, potential source rock, dispersed bitumens, saturated hydrocarbons (biomarkers), biodegradation, Khatyspyt Formation, Vendian (Neoproterozoic), Siberian Platform

 

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Dmitriy S. Melnik
Novosibirsk State University
3, Ak.Koptyug ave., Novosibirsk, 630090, Russian Federation
E-mail: MelnikDS@ipgg.sbras.ru

Tat’yana M. Parfenova
Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
3, Ak.Koptyug ave., Novosibirsk, 630090, Russian Federation

Vladimir I. Rogov
Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences
3, Ak.Koptyug ave., Novosibirsk, 630090, Russian Federation

 

For citation:

Melnik D.S., Parfenova T.M., Rogov V.I. (2020). Biodegraded bitumens dispersed in Vendian (Neoproterozoic) rocks of the Khatyspyt Formation, Northeastern Siberia. Georesursy = Georesources, 22(2), pp. 37-44. DOI: https://doi.org/10.18599/grs.2020.2.37-44