东北四龙湾玛珥湖现代硅藻氧同位素组成与水体温度的热力学分馏特征

被引：2

作者：

李东

汉景泰

机构：

[1] 中国科学院地质与地球物理研究所,中国科学院新生代地质与环境重点实验室

来源：

科学通报 | 2010年 / Z2期

关键词：

硅藻; 氧同位素; 同位素分馏; 四龙湾; 湖泊;

D O I：

暂无

中图分类号：

P597 [同位素地质学与地质年代学];

学科分类号：

070902 ;

摘要：

硅藻氧同位素已日益成为重要的定量古气候研究手段,但在我国仍处探索阶段.选取东北四龙湾玛珥湖进行了为期2a的湖泊监测、样品收集和现代硅藻氧同位素研究,为该玛珥湖定量化古气候记录研究奠定基础.逐步氟化条件实验表明,我们已完全具备和掌握了硅藻氧同位素研究的实验设备和技术方法.现代硅藻样品的氧同位素结果显示,在3.6～24℃的水体温度区间硅藻氧同位素与生长温度存在着线性分馏关系,分馏梯度为–0.185‰/℃～–0.238‰/℃,与近年来不同水体、不同地区、不同种属以及实验室培养硅藻的研究结果有良好的一致性,揭示了硅藻壳体氧同位素的分馏效应主要受控于生长温度.四龙湾表层和底层沉积硅藻氧同位素的对比研究发现,二者存在一定的差别,可能与不同深度沉积过程的差异以及硅藻来源差异有关.

引用

页码：2628 / 2634

页数：7

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