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西藏纳木错湖芯正构烷烃及其反映的8.4ka以来的环境变化 被引量:8
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作者 林晓 朱立平 +5 位作者 汪勇 王君波 谢曼平 鞠建廷 roland mausbacher Antje Schwalb 《科学通报》 EI CAS CSCD 北大核心 2008年第19期2352-2357,共6页
采用索氏抽提法提取纳木错NMLC-1孔湖芯沉积物中的正构烷烃,利用GC/MS进行了测试。在已经建立的深度一年代曲线基础上,通过分析正构烷烃的组成与含量,结合TOC,TN和CaCO3等环境代用指标,重建了纳木错湖区约8.4ka以来的环境变化历... 采用索氏抽提法提取纳木错NMLC-1孔湖芯沉积物中的正构烷烃,利用GC/MS进行了测试。在已经建立的深度一年代曲线基础上,通过分析正构烷烃的组成与含量,结合TOC,TN和CaCO3等环境代用指标,重建了纳木错湖区约8.4ka以来的环境变化历史。结果表明:约8.4-6.7kaBP期间,环境较温暖,降水呈增加趋势,末期变冷干。约6.7-2.9ka BP期间可分为两个亚期,早期温暖湿润,至6.0ka BP左右达到环境最适宜期;晚期温度波动降低,陆生植被和沉水植物退化,以3.0ka BP左右的冷事件结束。约2.9ka BP-现在,冷暖交替,1.4ka BP左右开始趋于干燥,600-400a BP间的降温体现了小冰期特征。 展开更多
关键词 湖泊沉积 正构烷烃 纳木错 青藏高原
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Environmental changes reflected by n-alkanes of lake core in Nam Co on the Tibetan Plateau since 8.4 kaB.P. 被引量:14
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作者 LIN Xiao ZHU LiPing +5 位作者 WANG Yong WANG JunBo XIE ManPing JU JianTing roland mausbacher Antje SCHWALB 《Chinese Science Bulletin》 SCIE EI CAS 2008年第19期3051-3057,共7页
The n-alkanes are extracted from NMLC-1 core that was drilled in the Nam Co, central Tibet. They are measured by using Gas Chromatography and Mass Spectrometry (GC/MS) for componential and quantitative analyses. Accor... The n-alkanes are extracted from NMLC-1 core that was drilled in the Nam Co, central Tibet. They are measured by using Gas Chromatography and Mass Spectrometry (GC/MS) for componential and quantitative analyses. According to the constructed depth-age model, the component and concentration of n-alkanes, together with total organic carbon (TOC), total nitrogen (TN) and carbonate are used to elu- cidate palaeoenvironmental changes of Nam Co during the past 8.4 ka. The results indicate that Holo- cene environment performs three stages in the lake area. In the stage of 8.4―6.7 kaB.P., it was warmer while precipitation slightly increased. This stage was ended by an obvious cold/dry event. During 6.7― 5.8 kaB.P., temperature increased rapidly and reached its maximum values at about 6.0 kaB.P. The environments were warm/wet optimum for the blooming of terrestrial plants and submerged aquatic plants. After that, temperature decreased continuously and showed the lowest values at about 3.0 kaB.P. From 2.9 kaB.P. to the present, temperature rose again but alternated with cold and warm. The lake area tended to be dry after 1.4 kaB.P. During 600―400 aB.P., the environmental feature was the reflection of "Little Ice Age". 展开更多
关键词 湖泊沉淀物 环境变化 链烷烃 西藏
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