【摘要】 在各种地质体中广泛分布的生物标志化合物在全球变化研究中有着广泛应用 ,特别是在海洋和湖泊沉积物中 ,研究工作已涉及到古植被、古温度、古降水量、古大气CO2 浓度和古季风等的恢复。文章介绍利用气相色谱仪、气相色谱 -质谱联用仪、气相色谱 -热转换 -同位素比质谱仪分析了一个长 40cm泥炭岩芯 (约 2 2 2年 )的生物标志化合物的分布及其单体氢同位素。结果显示 ,不管是生物标志化合物的分布 ,还是其单体稳定同位素特征都记载了气候 (温度 )的变化。正构脂肪酸的碳优势指数 (CPI值 )、正构烷烃C2 3/C31 比值、正构烷烃C2 3的δD值与温度有很好的对应关系更多还原

【Abstract】 Biomarkers occurring at a variety of geological environments have been shown to be effective in the exploitation of past global changes. Reconstructions of paleo vegetation, paleo temperature, paleo precipitation, paleo atmospheric CO 2 concentration, paleo monsoon were conducted in various sediments using the distributions and isotopic compositions of biomarkers. Here we present a 40cm long peat record based on the analyses of biomarker distribution and compound specific δ D using gas chromatography (GC), GC mass spectrometry (MS) and GC thermal conversion isotope ratio MS. The preliminary result shows that both the distribution and isotope composition of biomarkers are capable of reflecting the variations of paleoclimate. Specifically, The profile trends of the carbon preference index of n alkanoic acids, the ratio of C 23 /C 31 n alkanes and δ D of C 23 n alkane are comparable with the documented temperature record of the period the peat core spans.更多还原