Transformation of organic matter in the Holocene sediments of Lake Ochki (south Baikal region): Evidence from pyrolysis data

被引：0
作者：
V. N. Melenevskii
G. A. Leonova
V. A. Bobrov
V. A. Kashirtsev
S. K. Krivonogov
机构：
[1] Siberian Branch of the Russian Academy of Sciences,Trofimuk Institute of Petroleum Geology and Geophysics
[2] Russian Academy of Sciences,Sobolev Institute of Geology and Mineralogy, Siberian Branch
[3] Novosibirsk State University,undefined
来源：
Geochemistry International | 2015年 / 53卷
关键词：
recent sediments; diagenesis; organic matter; pyrolysis; hydrocarbons–biomarkers;
D O I：
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学科分类号：
摘要：
Transformation of organic matter (OM) in Holocene sediments of Lake Ochki (southern coast of Lake Baikal) at the early stages of diagenesis has been studied using pyrolytic methods of Rock Eval (RE-pyrolysis) and pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS). OM has been analyzed in lacustrine sediments and their main producers, phytoplankton and zooplankton. Data on the distribution of hydrocarbon–biomarkers in sediments indicate an uninterrupted influx of terrigenous OM and transformation of OM precipitated by microorganisms. The analysis of molecular composition of pyrolysates makes it possible to assume a sharp change of sedimentation conditions in the upper part of sedimentary sequence (0–60 cm). It is shown that the macromolecular aliphatic kerogen structure begins to form in incoherent sediment at the very early stages of diagenesis.
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页码：903 / 921
页数：18
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