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灵台风尘堆积中钙质结核的地球化学研究
Authors
周杰
孙有斌
安芷生
Publication date
1 January 2000
Publisher
Abstract
通过对甘肃灵台风成黄土-古土壤-红粘土序列中钙质结核的野外分布及形态特征观察,并对主元素和微量元素进行化学分析,发现结核中氧化物活动给分和惰性组分含量的比值在剖面中自下而上逐渐变大,反映了结核形成时其上覆土层所经历的淋溶程度逐渐增强;而MgO含量校正后的MgO/Cao比值则逐渐减小,批示结核形成时环境温度逐渐降低。灵台剖面自下而上不同层位结核中Sr/Ba比值及CaCO3含量的变化同氧化物含量及比
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Last time updated on 16/09/2020