| 柴达木盆地察尔汗古湖相地层正构烷烃与河蚬化石记录的古生态环境 |
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| 引用本文： | 杨明生,张虎才,李斌,常凤琴,雷国良,蒲阳.柴达木盆地察尔汗古湖相地层正构烷烃与河蚬化石记录的古生态环境[J].地球学报,2011,32(1):87-94. |
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| 作者姓名： | 杨明生 张虎才 李斌 常凤琴 雷国良 蒲阳 |
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| 作者单位： | 南昌大学环境与化学工程学院鄱阳湖环境与资源利用教育部重点实验室;中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;兰州大学资源环境学院西部环境教育部重点实验室;中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室 |
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| 基金项目： | 国家自然科学基金(批准号: 41001123, 40871096); 南昌大学博士人才基金(编号: 300478) |
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| 摘 要： | 利用常规14C、加速器(AMS)方法对柴达木盆地察尔汗湖一典型古湖相沉积剖面系统测年,并对测年结果进行不同组分和不同实验室对比,确定该剖面发育于察尔汗古湖高湖面时期(39.7 ka B.P.～17.5 ka B.P.).通过对削面沉积物正构烷烃的系统分析,结果表明正构烷烃携带了重要的湖泊演化的环境和生物信息,其中nC2...
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| 关 键 词： | 柴达木 古湖相沉积 正构烷烃 河蚬化石 古生态环境 |
N-alkanes and Corbicula Fossils in Shell Bar Section of the Qarhan Lake, Qaidam Basin and their Paleoenvironment Significance |
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| YANG Ming-sheng,ZHANG Hu-cai,LI Bin,CHANG Feng-qin,LEI Guo-Liang and PU Yang.N-alkanes and Corbicula Fossils in Shell Bar Section of the Qarhan Lake, Qaidam Basin and their Paleoenvironment Significance[J].Acta Geoscientia Sinica,2011,32(1):87-94. |
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| Authors: | YANG Ming-sheng ZHANG Hu-cai LI Bin CHANG Feng-qin LEI Guo-Liang and PU Yang |
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| Institution: | 1) School of Environmental and Chemical Engineering,Key Laboratory of Poyang Lake Environment and Resource Utilization of MOE,Nanchang University,Nanchang,Jiangxi 330031;2) State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing,Jiangsu 210008;3) Key Laboratory of Western China’s Environments,MOE,College of Earth Sciences and Environments,Lanzhou University,Lanzhou,Gansu 730000 |
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| Abstract: | The shell bar section of the Qarhan Lake in Qaidam Basin was systematically dated by means of accelerator mass spectrometry (AMS) and conventional radiocarbon dating, and the contrastive analyses of the dating results of various components from different laboratories show that the shell bar section does record the change of high paleolake level of Qarhan (39.7 ka B.P.~17.5 ka B.P.). A series of biomarkers were identified, which included n-alkanes, oxygen-containing organic compounds (fatty acid, n-alkane-2-ones), nitrogen-containing organic compounds (amide, nitrile), polycyclic aromatic compounds etc. The n-alkanes contain very essential information concerning the environment and vegetation during the lake evolution, of which the nC27/nC31 reveals proportionally the evolution of terrestrial woody and herbaceous vegetation, that is, the proportion of woody and herbaceous vegetation changed relatively significantly before the high paleolake level, and insignificantly during the high paleolake level. L/H, nC17/nC31 and nC21-/nC22+ reveal the change of aquatic organisms in the lake, and are more sensitive to climate change than nC27/nC31. There exist fairly good comparability between the appearance of Mollusk Corbicula fluminea in the section and the changes in amplitude and requency of L / H, nC17/nC31, nC21-/nC22 +, nC27/nC31, which must be the consequence of the Collaborative Responses between orbicula fluminea, bacteria algae, terrestrial vegetation and the climate environment. On the basis of observations of biomarkers and Corbicula fluminea fossils, this paper has tentatively revealed the relationship between bacteria algae, terrestrial vegetation and Corbicula fluminea during climate change and confirmed the existence of the high paleolake level of the last glacial period. |
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| Keywords: | Qaidam Basin paleolake deposit n-alkanes shell bar paleoenvironment |
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