TY - JOUR

T1 - Biodegraded bitumens dispersed in vendian (Neoproterozoic) rocks of the khatyspyt formation, northeastern Siberia

AU - Melnik, D. S.

AU - Parfenova, T. M.

AU - Rogov, V. I.

N1 - Мельник Д.С., Парфенова Т.М., Рогов В.И. Биодеградированные рассеянные битумы в породах хатыспытской свиты венда (неопротерозоя) на северо-востоке Сибирской платформы. - Георесурсы. - 2020.- Т. 22. - № 2. - С. 37-44

PY - 2020/4/1

Y1 - 2020/4/1

N2 - The organic matter of the Vendian (Neoproterozoic) Khatyspyt Formation was investigated. The new data obtained from the GS and GS-MS analyses include: high UCM humps andheightened 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 demethylatedterpanes 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 (syngeneic) 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 canbe discoveredin the Khatyspyt Formation.

AB - The organic matter of the Vendian (Neoproterozoic) Khatyspyt Formation was investigated. The new data obtained from the GS and GS-MS analyses include: high UCM humps andheightened 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 demethylatedterpanes 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 (syngeneic) 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 canbe discoveredin the Khatyspyt Formation.

KW - Biodegradation

KW - Dispersed bitumens

KW - Khatyspyt Formation

KW - Organic geochemistry

KW - Potential source rock

KW - Saturated hydrocarbons (biomarkers)

KW - Siberian Platform

KW - Vendian (Neoproterozoic)

KW - dispersed bitumens

KW - potential source rock

KW - biodegradation

KW - saturated hydrocarbons (biomarkers)

KW - organic geochemistry

KW - BASIN

UR - http://www.scopus.com/inward/record.url?scp=85087343144&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=43776115

U2 - 10.18599/grs.2020.2.37-44

DO - 10.18599/grs.2020.2.37-44

M3 - Article

AN - SCOPUS:85087343144

VL - 22

SP - 37

EP - 44

JO - Георесурсы

JF - Георесурсы

SN - 1608-5043

IS - 2

M1 - 5

ER -