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采用低硼高杂质离子样品硼同位素分析方法测定了黄土、古土壤样品中酸溶相硼含量及硼同位素组成.洛川黄土S0～S2剖面酸溶相硼含量变化范围为（0.8～2.7）×10-6,其δ11B值在-l.8～+18.6‰之间变化,多集中在0～+10‰之间.古土壤层的硼含量及分δ11B高于黄土层,尤以S1表现最显著.引起剖面上酸溶相硼含量及δ11B值变化的主要原因是化学风化作用和粘土吸附作用强度的变化.气候条件变化所引起的风化作用强度的变化可能是酸溶相硼含量及δ11B值发生变化的原因.
Boron isotope analysis of low boron and high impurity ion samples was used to determine the boron content and boron isotope composition of acid-dissolved phase in loess and paleosol samples.The content of boron in acid-soluble phase of S0 ~ S2 profile in Luochuan loess varied from (0.8 ~ 2.7) × 10-6, δ11B value varied from -18 to +18.6 ‰, mostly concentrated in the range of 0 to +10 ‰ .The content of boron and δ11B in the paleosol layer were higher than that in the loess layer, especially in S1 The main reason that caused the change of acid-soluble boron content and δ11B value in the section is the chemical weathering and the change of clay adsorption intensity.The change of weathering intensity caused by climate change may be the acid-soluble boron content and δ11B value The reason for the change.