摘要
本文对陕西洛川黄土中的碳酸盐从矿物成分、化学成分和同位素组成进行了系统研究,建立了确定黄土中原生方解石和次生方解石含量的方法,并提出了黄土气候地层研究的两个地球化学指标。研究表明,洛川黄土中的碳酸盐主要是次生方解石,是由原生方解石在成土过程中溶解转变而成的。
A. method for determining the contents of primary and secondary calcites in loess has been established, and two geochemical indices applicable to loess-climatic stratigraphy have been proposed. Our studies indicate that: 1) carbonates in the Luochuan loess are mainly of secondary origin; 2) the primary and secondary calcites in the Luochuan loess are mid-Mg calcite and low-Mg calcite, respectively; and 3) the stable isotopic composition of carbonates in the,Luochuan loess is typical of freshwater carbonates.
出处
《地球化学》
CAS
1988年第3期267-275,共9页
Geochimica
