Early diagenesis of bacteriohopanoids in Recent sediments of Lake Pollen, Norway

被引:51
作者
Innes, HE [1 ]
Bishop, AN [1 ]
Fox, PA [1 ]
Head, IM [1 ]
Farrimond, P [1 ]
机构
[1] Univ Newcastle Upon Tyne, NRG, Fossil Fuels & Environm Geochem Postgrad Inst, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
关键词
hopanoids; recent sediments; Lake Pollen; alkenones; composite hopanoids; environmental change; bacteriohopanepolyols;
D O I
10.1016/S0146-6380(98)00108-9
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The distribution of free bio- and geohopanoids were studied in a short (46 cm) core from Recent sediments of Lake Pollen, Norway. Bacteriohopanepolyols are abundant components of the sediments (totalling up to 321 mu g/g dry sediment; 7485 mu g/g TOC), bring dominated by C-32,33,34,35 tetrafunctionalised hopanoids. Significantly, bacteriohopanetetrol only accounts for between 7 to 62% of these (24% on average), indicating that composite bacteriohopanoids are more abundant sedimentary constituents, and thus more important precursors of geohopanoids than previously recognised. Downcore profiles of bio- and geohopanoid abundance show maxima at ra. 25 to 30 cm, with a marked decrease in abundance above this depth which coincides with a well-documented change in environment from fjord to isolated lake. A second maximum in biohopanoid abundance occurs at ca. 5 to 12 cm depth. Specific biohopanoids were affected to different extents by the change in environment, suggesting that they have, at least partly, different sources. Our data thus indicate that biohopanoids, and their geohopanoid products, may be sensitive to changes in depositional environment and that they have potential to act as markers for environmental conditions. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1285 / 1295
页数:11
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