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引用本文:刘秀明,贾玉鹤,王世杰.生物壳体锶地球化学恢复盆地古水文——以泥河湾盆地为例.湖泊科学,2001,13(3):211-219. DOI:10.18307/20010303
LIU Xiuming,JIA Yuhe,WANG Shijie.Palaeohydrological Restoration by Strontium Geochemistry of Biogenic Shells:As Exemplified by Nihewan Basin. J. Lake Sci.2001,13(3):211-219. DOI:10.18307/20010303
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生物壳体锶地球化学恢复盆地古水文——以泥河湾盆地为例
刘秀明, 贾玉鹤, 王世杰
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
摘要:
本文以著名的泥河湾盆地小渡口剖面28层为实例,通过有孔虫、介形虫、腹足类微体生物壳体87Sr/86Sr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/86Sr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.
关键词:  生物壳体  87Sr/86Sr  Sr/Ca  古水文条件  小渡口
DOI:10.18307/20010303
分类号:
基金项目:国家自然科学基金(批准号:49673201)资助项目
Palaeohydrological Restoration by Strontium Geochemistry of Biogenic Shells:As Exemplified by Nihewan Basin
LIU Xiuming, JIA Yuhe, WANG Shijie
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, P. R. China
Abstract:
Fresh waters contained 87Sr/86Sr information are related to the st rontium isotopic compositions of different rock types which they flowed across.The ratios of Sr/Ca in lake are usually a proxy of salini ty, 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 inf low to the basin, and of the changes of water in basin.A study on example of the 28th bed of Xiaodukou sect ion, Nihewan basin, implies that the st rontium 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.
Key words:  Biogenic shell  87Sr/86Sr  Sr/Ca  palaeohydrology  Xiaodukou section
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