NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Geochemical characteristics of organic compounds in a permafrost sediment core sample from northeast Siberia, RussiaWe studied total organic carbon (TOC), hydrocarbons and fatty acids in a permafrost sediment core sample (well 6-90, length 32.0 m, 1.5-2.5 Ma BP) from northeast Siberia (approximately 70 degrees N, 158 degrees E), Russia, to elucidate their geochemical features in relation to source organisms and paleoenvironmental conditions. Long-chain n-alkanes and n-alkanoic acids (>C19) were most predominant hydrocarbons and fatty acids, respectively, so organic matter in the sediment core was derived mainly from vascular plants and, to a much smaller extent, from bacteria. Low concentrations of unsaturated fatty acids revealed that organic matter in the sediment core was considerably degraded during and/or after sedimentation. The predominance of vascular plant components, the major ionic components of nonmarine sources, and geological data strongly implied that the sediment layers were formed in shallow lacustrine environments, such as swamp with large influences of tundra or forest-tundra vegetation. Also, no drastic changes in paleoenvironmental conditions for biological activity or geological events, such as sea transgressions or ice-sheet influences, occurred at the sampling site approximately 100 km from the coast of the East Siberian Sea during the late Pliocene an early Pleistocene periods.
Document ID
20040088941
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Matsumoto, G. I.
(Otsuma Women's University Tokyo)
Friedmann, E. I.
Gilichinsky, D. A.
Date Acquired
August 21, 2013
Publication Date
October 1, 1995
Publication Information
Publication: Proceedings of the NIPR Symposium on Antarctic Meteorites. NIPR Symposium on Antarctic Meteorites
Volume: 8
ISSN: 0914-5621
Subject Category
Geosciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW4-044
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
Non-NASA Center

Available Downloads

There are no available downloads for this record.
No Preview Available