Variations in organic matter composition in sediments from Lake Huguang Maar (Huguangyan), South China during the last 68 ka: implications for environmental and climatic change

doi:10.1016/S0146-6380(03)00158-X

	Variations in organic matter composition in sediments from Lake Huguang Maar (Huguangyan), South China during the last 68 ka: implications for environmental and climatic change
	Fuhrmann, A ; Mingram, J ; Lucke, A ; Lu, HY ; Horsfield, B ; Liu, JQ ; Negendank, JFW ; Schleser, GH ; Wilkes, H
刊名	ORGANIC GEOCHEMISTRY
	2003
卷号	34 期号:11 页码:1497-1515
ISSN号	0146-6380
DOI	10.1016/S0146-6380(03)00158-X
文献子类	Article
英文摘要	This study presents a continuous and long-term palaeoenvironmental and palaeoclimatic record from a lacustrine sediment core (Lake Huguang Maar) at the northern coast of the South China Sea, extending back to about 68 cal ka BP. We provide a comprehensive ecosystem analysis from the opportunity to combine organic geochemical and palynological data. Several climatically induced changes to the flora and fauna have been recognised. From 68 to 58 and 48 to 40.5 cal ka BP, relatively depleted delta(13)C(TOC) (-31.3 to -25.0%) and delta(13)C values of mid- and long-chain n-alkanes (-34.3 to -30.2%), as well as high percentages of tropical pollen, indicate a vegetation dominated by subtropical/tropical forest (C(3) plants). An expansion of a mixed C(3)/C(4) open grassland between 58 and 48 and particularly after 40.5 cal ka BP mirrors drier climatic conditions, in conjunction with a lowering of atmospheric CO(2) concentrations; delta(13)C(TOC) (-24.1 to -16.8%) and delta(13)C values of n-alkyl lipids (-28.9 to -24.1%) are heavier, higher percentages of non-arboreal pollen were observed and the wood/grass lignin index (WGLI) from open pyrolysis (Py-GC) indicates a higher input of grass lignin. Abundant oxidised terrigenous particles that resulted from increased fire activity and/or greater erosion rates are a further hint of enhanced dryness. The clear drop in moisture availability suggests that this site is sensitive in fluctuations of the summer and winter monsoon activity in accordance with other proxy records in south-east Asia. The response of the aquatic ecosystem is documented by an extremely large delta(13)C shift of algal-derived botryococcenes from -35.4 to -6.2%, which records a change towards a bicarbonate carbon source at low dissolved CO(2) concentrations. (C) 2003 Elsevier Ltd. All rights reserved.
WOS关键词	PYROLYSIS-GAS CHROMATOGRAPHY ; ALGA BOTRYOCOCCUS-BRAUNII ; CARBON-ISOTOPE FRACTIONATION ; SEA-SURFACE TEMPERATURE ; OIL-SHALE DEPOSIT ; MASS-SPECTROMETRY ; ATMOSPHERIC CO2 ; SACRED-LAKE ; CHEMICAL-CHARACTERIZATION ; DELTA-C-13 ANALYSES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000186353300003
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78441]
专题	中国科学院地质与地球物理研究所
作者单位	1.Geoforschungszentrum Potsdam, Sect Organ Geochem 4 3, D-14473 Potsdam, Germany 2.Forschungszentrum Julich, ICG V Sedimentare Syst, D-52425 Julich, Germany 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Fuhrmann, A,Mingram, J,Lucke, A,et al. Variations in organic matter composition in sediments from Lake Huguang Maar (Huguangyan), South China during the last 68 ka: implications for environmental and climatic change[J]. ORGANIC GEOCHEMISTRY,2003,34(11):1497-1515.
APA	Fuhrmann, A.,Mingram, J.,Lucke, A.,Lu, HY.,Horsfield, B.,...&Wilkes, H.(2003).Variations in organic matter composition in sediments from Lake Huguang Maar (Huguangyan), South China during the last 68 ka: implications for environmental and climatic change.ORGANIC GEOCHEMISTRY,34(11),1497-1515.
MLA	Fuhrmann, A,et al."Variations in organic matter composition in sediments from Lake Huguang Maar (Huguangyan), South China during the last 68 ka: implications for environmental and climatic change".ORGANIC GEOCHEMISTRY 34.11(2003):1497-1515.