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《Geoscience》 2018-05
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Composition of Lipid Compounds in the Peat Deposit in Mildred Bog from the Athabasca Region,Canada

HE Dashuang;HUANG Haiping;HOU Dujie;ZHANG Penghui;Institute of Geophysical and Geochemical Exploration,CAGS;School of Energy Resources,China University of Geosciences;Department of Geoscience,University of Calgary;  
A total of 37 peat samples from Mildred bog in the Athabasca Region,Canada,were analyzed with GC-MS to reveal the compositional characteristics and origins of peat lipids. The results show that long-chain components predominate in the n-alkanes,n-alkan-2-ones,n-alkanals,n-alkanols,n-fatty acids and fatty acid methyl esters,with strong odd or even carbon predominance. Polar compounds of steroids and terpenoids are also present in relatively high abundances. According to molecular geochemistry of the peat samples,the organic matter in Mildred peat profile was mainly derived from the in situ vascular plants,and also from Sphagnum and aquatic plants. Woody plants of conifer,woody debris and Ericaceae,herbaceous plants of Cyperaceous,and Sphagnum are the main peat-forming plants. Among polar compounds,γ-lactone is considered to be a self-oxidation product of tocopherols. A series of sesquiterpene,pentacyclic triterpenoid ketones,pentacyclic triterpenoid alcohols and pentacyclic triterpenes are abundant in the top interval,and their formation are associated with Sphagnum or higher plants. Most steroids are not origin-specific,and the distributions of C28,C29 and C30 steroids are assigned to a higher plant source. γ-Sitosterol,campesterol and stigmastan-3,5,22-triene are effective biomarkers for terrigenous higher plants.
【Fund】: 中国地质科学院地球物理地球化学勘查研究所中央财政科研项目结余资金项目资助(JY201705)
【CateGory Index】: P593
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