论文部分内容阅读
武都地区晚更新世以来堆积了厚约17m的黄土地层,其间夹有多层厚度不一、发育程度不同的古土壤层.在剖面13.2~17m黄土中,野外可清晰的观察到6层古土壤.通过剖面磁化率、粒度、稳定同位素、元素地球化学、TL年代、CaCO3、有机质含量的综合分析,认为它敏感而详尽地记录了深海氧同位素第5阶段的气候变化历史.对比研究结果显示:除总体模型与中国中西部黄土高原、深海氧同位素及南极冰心记录一致外,还可以与格陵兰Summit冰心记录进行良好的细节对比,揭示了全球气候变化地质记录的统一性.
Since the Late Pleistocene in the Wudu area, a loess layer of about 17 m in thickness has been deposited, with a number of ancient soil layers with different thicknesses and degrees of development. In the section of 13.2 ~ 17m loess, 6 layers of ancient soil can be clearly observed in the field. Based on the comprehensive analysis of magnetic susceptibility, grain size, stable isotope, elemental geochemistry, TL, CaCO3 and organic matter, it is considered that it sensitively and exhaustively records the history of the 5th phase of the deep-sea oxygen isotope climate change. The results of the comparative study show that except for the overall model which is consistent with the records of the central and western Loess Plateau, deep-sea oxygen isotopes and Antarctic ice cores, it can also be compared with that of the Greenland Summit ice core records to reveal the unity of global climate change geological records.