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
文献类型：期刊论文
| 作者 | Fuhrmann, A; Mingram, J; Lucke, A; Lu, HY; Horsfield, B; Liu, JQ; Negendank, JFW; Schleser, GH; Wilkes, H |
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 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 |
| WOS记录号 | WOS:000186353300003 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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