| 泥河湾盆地的水下黄土堆积及其古气候意义 |
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| 引用本文： | 夏正楷.泥河湾盆地的水下黄土堆积及其古气候意义[J].地理学报,1992,47(1):58-65,T001. |
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| 作者姓名： | 夏正楷 |
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| 作者单位： | 北京大学地理系 |
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| 摘 要： | 本文论述了泥河湾盆地第四纪河湖相地层中水下黄土堆积的特征，认为水下黄土堆积是介于气下黄土堆积河湖相沉积之间的一种过渡类型，水下黄土和气下黄土都是干冷气候条件下的产物，而河湖相沉积则形成于相对温湿的气候环境。在沉积剖面中水下黄土和河湖相沉积交替出现，形成水下黄土－河湖相沉积系列，这个系列反映了气候的周期性变化，它可以与我国洛川剖面的黄土－古土壤系列及深海岩芯V28－239的氧同侠素气候期，很好地进行对比。这为我国华北第四纪古气候地层序列的建立，又提供了一个重要的途径。
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| 关 键 词： | 水下黄土堆积 黄土－古土壤系列 深海岩芯V28－239 氧同位素 泥河湾盆地 古气候 |
UNDERWATER LOESS AND PALEOCLIMATE |
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| Xia Zhengkai.UNDERWATER LOESS AND PALEOCLIMATE[J].Acta Geographica Sinica,1992,47(1):58-65,T001. |
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| Authors: | Xia Zhengkai |
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| Abstract: | In East Asia during the Pleistocene there happened many loess shower events', in which a lot of loess ash fell into the ancient lake, then formed a special sediment in the lacustrine profile, this sediment is' called underwater loess.
This paper deals with some characteristics of underwater loess in the Nihewan basin. On the basis' of pollen analysis and surface structure of quartzite sands, we conclude that the underwater loess was fromed in the dry-colder climate, and the lacustrine formed in the warm-dampness more than loess deposition region. Alternation of underwater-loess and lacustrine in the Nihewan series formed an underwater loess-lacustrine system, that provided climatic vari ations in Quaternary period: for example, since 72 0 000yrs. BP. paleoclimatic veriations can be obviously divided into 8 dry-cold and 8 warm-damp periods. It can be completely compared with variation of 18 content of deep-sea core V28 .23 and paleoclimatic evolution shown by loess-paleosoil system in lochuan. |
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| Keywords: | Underwater loess Loess-paleosoil system deep-sea core |
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