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中国黄土堆积记录了第四纪东亚古季风气候变迁历史,黄土古土壤的粒度作为季风气候变化的替代性指标得到了广泛应用.除了从黄土中分离的石英粒度可作为较好的冬季风强度指标外,在黄土全样粒度指标的选用上还存在着不确定性,现在常用到的就有“中值粒径”、“粗细颗粒比值”、“粗颗粒含量”等多种,究竟哪一个粒度指标可以作为较敏感的古气候变化代用指标是值得深入研究的.本文以倒数第2次间冰期(S2)以来洛川黄土堆积为例探讨这个问题.
China Loess accumulation records the history of Quaternary monsoon climate change in the ancient Quaternary, ancient loess particle size as an alternative indicator of monsoon climate change has been widely used.In addition to the quartz grain size from loess can be used as a good indicator of winter monsoon intensity, There are still some uncertainties in the selection of index of full size of loess samples. Nowadays, there are many kinds of indexes such as “median particle diameter”, “coarse / fine particle ratio” and “coarse particle content” As a more sensitive indicator of paleoclimatic change proxy deserved further study.In this paper, we discuss the problem of the accumulation of Luochuan loess since the penultimate interglacial (S2).