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为了找到一种方法把黄土中原生和次生碳酸盐有效地区别开来,对陕西洛川黄土——古土壤剖面中不同形态的土壤碳酸盐进行了Sr同位素和部分微量元素的研究。结果表明黄土中原生碳酸盐以高Sr含量和低~(87)Sr/~(86)Sr比值为特点,次生碳酸盐以低Sr含量和高~(87)Sr/~(86)Sr比值为标志。利用黄土碳酸盐的Sr同位素组成和微量元素分布特征综合区别其原生和次生碳酸盐比例可能是一种有效的地球化学方法。该方法对于进一步示踪黄土碳酸盐的来源乃至黄土物质的来源都有潜在意义。
In order to find a way to effectively differentiate the primary and secondary carbonates from the loess, Sr isotope and some trace elements of different forms of carbonate in the loess-paleosol profile of Luochuan, Shaanxi Province were studied. The results show that the primary carbonate in the loess is characterized by high Sr content and low 87 Sr / 86 Sr ratio. The secondary carbonate shows low Sr content and high 87 Sr / Sr ratio for the logo. It can be an effective geochemical method to make a comprehensive distinction between primary and secondary carbonate ratios by using the characteristics of Sr isotope composition and trace element distribution of loess carbonate. This method has potential significance for further tracing the origin of loess carbonate and the source of loess material.