摘要
本文详细地阐述了海水 陆表水双元体系中锶同位素的混合原理、混合水体中87Sr/ 86Sr值与盐度的定量关系。利用Sr同位素不随生物、化学作用过程发生分馏作用及Sr与Ca化学性质相似等特征 ,地层、沉积物中生物壳体和碳酸盐岩87Sr/ 86Sr值可作为沉积水体 (古 )盐度确定的一种有用工具。文中详细地综述了国内外在这方面的研究进展 ,并讨论了成岩后生作用对生物壳体和碳酸盐岩87Sr/ 86Sr原始值的影响作用 。
Large variations in strontium concentrations exist between seawater (8×10 -6 ) and freshwater (<1×10 -6 ), the strontium isotopic ratios of freshwater are either higher or lower than global seawater values and there is a simple mixing relationship between the two. Furthermore, organic shell and carbonate, with no vital effect, are the ideal paleoenvironment proxies. This paper reviews the hyperbolic relationship between 87 Sr/ 86 Sr and salinity, and the progress in the application of strontium isotopes of the shell and carbonate as a key tool to determine salinity (paleosalinity). Meanwhile, the effects of diagenic alteration on primary 87 Sr/ 86 Sr values for the shell and carbonate are also discussed. In short, the method is useful and reliable to reconstruct the paleoenvironment and quantify the paleosalinity and its change in the transition facies.
出处
《矿物学报》
CAS
CSCD
北大核心
2000年第1期91-96,共6页
Acta Mineralogica Sinica
基金
国家自然科学基金!(批准号 :49673 2 0 1)资助
关键词
锶同位素
古盐度
古环境
生物壳体
碳酸盐岩
strontium
paleosalinity
paleoenvironment
organic shell
carbonate
