多瑙河中游盆地黄土和其它陆相层序

LOESS AND OTHER SUBAERAL SEQUENCES IN THE MIDDLE DANUBIAN BASIN

文章叙述了多瑙河中游盆地的第四系黄土与古土壤层序。一般第四纪下降盆地的黄土、砂及古土壤层的层序两倍于抬升的黄土高原及山坡部位所见到的数量，因此能划分得更详细。利用盆地中划分的层序重建的古气候特征可以表征大小不同的区域性差别，同样亦可揭示不同时代的差异。根据冷黄土、埋藏溪流、河阶地等的位置，亦可根据不同古生物的指示，可获得某些气候类型（旱冷的、湿冷的）的重要信息。

The number of loess and paleosol units in Quaternary sequences of the Middle Danubian Basin is often closely related to the geological and geomorphological position of the sediment series. Particularly on uplifted loess plateaus and on foothill slopes the sequence include less stratigraphic units than in basins which have been subsided constantly during the Quaternary. In basins of Quaternary subsidence the number of loess, sandy and paleosol horizons are may be twice as many as that of the loess paleosol units on plateaus and on foothill surfaces. The sequence of sediment traps can usually be better subdivided. Under such circumstances the paleoclimatic reconstruction of loess paleosol sequences reveals major (inter)regional differences, also in the length of the formation period. Nevertheless, the circumspective evaluation of lithostratigraphic units provides a framework for outlining the succession of climatic changes. Important information on certain climatic types (cold and dry or cold and wetter phases) may be gained from the traces of frost phenomena in the zones of cold loess, buried dells and river terraces as well as from investigation of the paleogeographic environments of various life traces etc. The time of past events can be established from the lithostratigraphic framework with some probability. Over identical time intervals, different litho and chronostratigraphical sequences could evolve in different morphotectonic positions. The sedimentary sequences in basins and other sediment traps are more throughly subdivided than on uplifted plateaux and watersheds.