末次间冰期以来渭南黄土剖面地球化学指标所反映的古气候变化

渭南剖面由全新世土壤Ｓ０，末次冰期黄土Ｌ１及末次间期古土壤Ｓ１和组成。其中，Ｌ１可以进一步划分为三层黄土和两层弱发育的土壤；Ｓ１由三层土壤组成。碳酸盐，游离铁及有机质含旺在渭南剖面上的变化表明上述化学成分可以用作缺气候的替代性指标，并能反映古气候的变化。

GEOCHEMICAL INDICATORS AND THEIR SIGNIFICANCE IN PALEOCLIMATIC CHANGES IN WEINANLOESS SECTION SINCE THE LAST INTERGLACIAL

einan loess section consists of Holocene soil S0, last glacial loess L1, and last interglacial soil S1. Among them, L1 can be divided into three clear loess beds (L1-1,L1-3 and L1-5), and two weakly developed intercalated soil beds(L1-2 and L1-4); Si can be di vided into three soil beds (S1-1,S1-2and S1-3). Based on the contents of carbonate, free Fe2O3, and the TOC in Weinan section, the environmental evolution of this region is discussed for the last glacial-interglacial cycle. The results indicate that the chemical parameters mentioned above can be used as proxy indexes for climate, and the variations of these indexes reflect the cyclic nature of the Quaternary climatic change. In addition, the climatic records of Weinan section can also be correlated with the global climatic changes. The interesting finding is that climatic curve of L1-5, which can be correlated with Stage 4 of marine oxygen isotope records, consists of three troughs and two peaks which may suggest secondary warm-cold oscillations of this period.