地球学报2011，Vol.32Issue(1)：87-94,8.DOI:10.3975/cagsb.2011.01.11
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
N-alkanes and Corbicula Fossils in Shell Bar Section of the Qarhan Lake, Qaidam Basin and their Paleoenvironment Significance
摘要
Abstract
The shell bar section of the Qarhan Lake in Qaidam Basin was systematically dated by means ofaccelerator mass spectrometry (AMS) and conventional radiocarbon dating, and the contrastive analyses of thedating results of various components from different laboratories show that the shell bar section does record thechange 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), nitro-gen-containing organic compounds (amide, nitrile), polycyclic aromatic compounds etc. The n-alkanes containvery essential information concerning the environment and vegetation during the lake evolution, of which thenC27/nC31 reveals proportionally the evolution of terrestrial woody and herbaceous vegetation, that is, theproportion 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 aquaticorganisms in the lake, and are more sensitive to climate change than nC27/nC31. There exist fairly goodcomparability between the appearance of Mollusk Corbicula fluminea in the section and the changes in amplitudeand frequency of L / H, nC17/nC31, nC21/nC22 +, nC27/nC31, which must be the consequence of the CollaborativeResponses between Corbicula 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.关键词
柴达木/古湖相沉积/正构烷烃/河蚬化石/古生态环境Key words
Qaidam Basin/ paleolake deposit/ n-alkanes/ shell bar/ paleoenvironment分类
生物科学引用本文复制引用
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):87-94,8.基金项目
本文由国家自然科学基金(批准号:41001123,40871096)和南昌大学博士人才基金(编号:300478)联合资助. （批准号:41001123,40871096）
