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厚度153m的曹村剖面出露了厚145m的完整黄土地层,为L1—L33的连续风尘沉积,为黄土高原东南部三门峡地区黄土地层的代表。建立曹村黄土地层的精确时间标尺,不仅能在千年时间尺度下探讨黄土高原古季风变迁,而且着眼于全球古气候变化开展海陆对比研究。本文对现有的4种时间标尺模式进行了介绍,应用磁化率模式和粒度模式开展了三门峡黄土时间标尺研究,并进行了校验,说明了几种模式建立曹村黄土时间标尺的可行性。
The Caocun section with a thickness of 153m exposes a complete loess layer 145m thick and is a continuous dust deposit of L1-L33, representing loess layers in the Sanmenxia area southeast of the Loess Plateau. The exact time scale of the loess formation in Cao Village can not only explore the paleoclimatic changes over the Loess Plateau but also focus on the global paleoclimatic changes in the comparison between land and sea. In this paper, the existing four time scale modes are introduced. The study of the Sanmenxia loess time scale is carried out by using the susceptibility model and the grain size model. The verification is made and the feasibility of establishing several models for establishing the Loess time scale of the Cao Village is demonstrated.