Abstract
Organic geochemical analysis was performed on a sediment core HN1 from Fildes Peninsula on King George Island,Western Antarctica. Short-chain n -alkanes were the main components of the aliphatic hydrocarbons present, and they were likelyto be from algae and bacteria; n -C 23 was likely derived from moss. Fecal sterols and phytol dominated the alcohol composition,and may have come from seal feces and vegetation, respectively. The fluctuations in their concentrations generally haveresponded to historical changes in the ecosystems near the region. The even-carbon fatty acids, such as n -C 16 , n -C 18 and n -C 24 ,dominated the alkenoic acid composition, which mainly originated from bacteria, moss and zooplankton. The low concentrationsof unsaturated fatty acids showed a predominance of C 16:1 and C 18:1 unsaturated acids, and demonstrated that the sediment waswell preserved and had a simple and stable source of organic materials.
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