| 高原湖泊沉积物碳酸盐稳定同位素及孔隙水碳酸盐体系地球化学研究 | |
| 唐德贵 | |
| 1992 | |
| Degree Grantor | 中国科学院地球化学研究所 |
| Place of Conferral | 中国科学院地球化学研究所 |
| Degree Name | 博士 |
| Degree Discipline | 环境地球化学 |
| Keyword | 云贵高原 湖泊沉积物 碳酸盐 孔隙水 稳定同位素 寄宿时间 环境变化 |
| Abstract | 在沉积物早期成岩作用过程中，扩散、对流和化学反应等动力学因素共同影响着孔隙水的化学平衡性质，使孔隙水在水－沉积物界面附近出现方解石不饱和现象，而在深部却呈饱和状态。从云贵高原的洱海、泸沽湖和红枫湖等湖泊的研究可以发现：在方解石不饱和带中，孔隙水的HCO_3~-和Ca~(2+)的浓度梯度比值大于理论值（1.34），HCO_3~-和Ca~(2+)的垂直分布可以用非线性常微分方程组（3-10）来描述。对寄宿时间较长的非封闭湖泊，沉积物碳酸盐的C、O稳定同位素变化特征可以用δ~（13）C-δ~（13）O模式图表示出来；特别当输入寄宿时间与蒸发寄宿时间的比值较大时，随沉积深度的不同，碳酸盐的δ~（13）C和δ~（13）O值可能呈正相关波动变化，其δ~（13）O能够反映了湖区气温变化的特征。 |
| Other Abstract | In early diagenesis, Pore-water is undersaturated with Calcite because of the kinetic interaction of diffusion, advection and chemical reactions near the sediment-water interface, but in depth, it becomes saturated again. Chosing recent sediments of Erhai Lake, Lugu Lake and Hongfeng Lake in Yunnan-Guizhou Plateau, China, as a case study, We show that the non-linear ordinary differential equations(3-10) can give good results compared with the measured concentrations of vertical distribution of HCO_3~- ion and Ca~(2+) ion in pore-water, and in undersaturated depth range, the concentration gradience ratio of HCO_3~- ion to Ca~(2+) ion is higher than the calculated value(1.34). Because of the long resident time of Erhai Lake and Lugu Lake, the sediment carbonate show highly correlated covariance between oxygen and carbon stable isotopic variations,and δ~（13）O value also reflects the summer temperature changes when primary carbonate precipitating in surface water of lakes. |
| Pages | 70 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/3882 |
| Collection | 研究生_研究生_学位论文 |
| Recommended Citation GB/T 7714 | 唐德贵. 高原湖泊沉积物碳酸盐稳定同位素及孔隙水碳酸盐体系地球化学研究[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,1992. |
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| N88705.pdf（6704KB） | 暂不开放 | -- | Application Full Text | |||
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