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n-Alkan-2-one distributions in a northeastern China peat core spanning the last 16 kyr |
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| Authors: | Yanhong Zheng Weijian Zhou Xiaomin LiuChuanlun L Zhang |
| Institution: | a State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China b State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China c Xi’an AMS Center, Xi’an 710061, China d Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA |
| Abstract: | Most research on long chain methyl ketones has focused on their origins and distributions. Their application in paleoclimate studies is less common than that of other n-alkyl lipids. The goal of this research was to explore this potential by studying n-alkan-2-ones from the Hani peat sequence in northeastern China. They were identified using gas chromatography-mass spectrometry (GC-MS) and showed a distribution ranging from C19 to C31 with a strong odd/even predominance. This type of distribution is considered to derive from Sphagum and microbial oxidation of n-alkanes. Comparison with climate sensitive indicators and macrofossil analysis shows that microbial oxidation of n-alkanes derived from higher plants was enhanced during the warm early Holocene period. This led us to develop three n-alkan-2-one proxies - C27/ΣC23-31 (C27/HMW-KET), carbon preference index (CPIH-KET) and average chain length (ACL(27-31)-KET) - as possible indicators of paleoclimate in the peat-forming environment. These proxies, in combination with C27n-alkane δD values and peat cellulose δ18O records, might allow examination of paleo-ecosystem behavior during climatic evolution in northeastern China over the past 16,000 yr. |
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