生物壳体锶地球化学恢复盆地古水文——以泥河湾盆地为例  

Palaeohydrological Restoration by Strontium Geochemistry of Biogenic Shells: As Exemplified by Nihewan Basin

作　　者：刘秀明[1] 贾玉鹤[1] 王世杰[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002

出　　处：《湖泊科学》2001年第3期211-219,共9页Journal of Lake Sciences

基　　金：国家自然科学基金 (批准号 :4 9673 2 0 1)资助项目

摘　　要：本文以著名的泥河湾盆地小渡口剖面 2 8层为实例 ,通过有孔虫、介形虫、腹足类微体生物壳体87Sr/86 Sr比值与盆地汇水区域Sr同位素地层分布特征对比分析以及生物壳体Sr/Ca与盐度的相关性 ,来重塑沉积盆地汇水来源变更、湖水变化等古水文要素 ,进而可以反演区域构造-气候变化 .实例研究结果表明 :生物壳体87Sr/86 Sr及Sr/Ca比值等地球化学方法是恢复盆地古水文条件的重要手段 .Fresh waters contained 87Sr/ 86Sr information are related to the strontium isotopic compositions of different rock types which they flowed across. The ratios of Sr/Ca in lake are usually a proxy of salinity, which can reflect the variation in levels of lake. So, the Sr geochemistry of shells from basin sedimentary can be used to derive a record of the different resources of waters inflow to the basin, and of the changes of water in basin. A study on example of the 28th bed of Xiaodukou section, Nihewan basin, implies that the strontium geochemistry of shell is a desirble method of palaeohydrological restoration, and further indicates it would be a good future matching with carbon and oxygen isotopes and other trace element geochemisty.

关 键 词：生物壳体 古水文条件 泥河湾盆地 锶同位素 地球化学 

分 类 号：P59[天文地球—地球化学]