摘要
通过对江川湖盆沉积物中螺壳化石样品的处理和分析,测定了贝壳碳酸盐的δ^(13)C值和δ^(18)O值。结合孢粉资料,研究贝壳碳酸盐碳氧同位素分布及变化,对江川湖盆的古气候及盆地演化提供有用的信息。
The oxygen and carbon isotopic compositions of inland lake shelly carbonatesare measured by mass spectrometry. The spore-pollen analysis informations are studied. Theuseful information is presented for paleoclimate research of Jiangchuan lake basin. δ^(18)O value of shelly carbonates in Jiangchuan lake basin is -2.12th-12.7‰_(PDB), δ^(13)C is-2.34‰--7.30‰_(PDB). The δ^(18)O, δ^(13)C values don't vary with different sedimentary environ-ments. There are many cold-warm climatic changes since Quarternary Period. Thetempera-ture in the interglacial stage is about 18-30°C, It's about -8--2°C at glacialstage. There arcno evidence for salinization in the evolution or lake basin.
关键词
古气候
碳
氧
同位素
碳酸盐
贝壳
内陆湖泊
oxygen and carbon isotopic composition
shelly carbonate
paleoclimate
salinity
basin analysis
