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通过对灵台剖面7.0MaBP以来的黄土-红粘土堆积以及黄土高原和北京6个马兰黄土剖面的石英氧同位素分析,发现石英氧同位素比值受沉积后作用的影响不明显,同一粒径颗粒的石英氧同位素比值比较能够较好地反映源区变化特征;灵台剖面红粘土的氧同位素比值的变化范围以及波动特征和第四纪黄土-古土壤相似,表明红粘土和其上的黄土有类似的沉积物源系统;此外,整个剖面上的石英氧同位素比值的波动可能仅反映了物源区域的变化。
By analyzing the oxygen isotope ratios of quartz loess and red clay accumulated in Lingtai Section since 7.0MaBP and the six Malan loess profiles in the Loess Plateau and Beijing, it was found that the quartz oxygen isotope ratio was not affected obviously by sedimentation. The quartz oxide with the same particle size The comparison of isotopic ratio can reflect the variation of source area well. The range of variation of oxygen isotope ratio of red clay in Lingtai section and its fluctuation characteristics are similar to that of Quaternary loess-paleosol, indicating that red clay and its loess have similar sediments Source system; in addition, fluctuations in the quartz oxygen isotope ratio over the entire section may only reflect changes in the provenance area.