摘要
斋堂盆地的马兰黄土，是我国晚更新世的标准地层之一。为了揭示该地黄土的生成及其形成古环境，本文着重对该盆地黄土进行了构造、结构、颗粒成分、碳酸盐以及铁锰集合体等综合研究。研究结果表明，斋堂盆地的马兰黄土同黄河中游的马兰黄土在组织结构、构造以及颗粒成分上极为类似，同属风成沉积；离石黄土同黄河中游离石黄土之间存在明显差异，在其形成过程中，曾经遭受过多次坡洪积作用参与。在马兰黄土中还遭受若干次冻融作用，表明斋堂盆地黄土形成时某些阶段古气温还相当低。
The malan loess in the zhaitang basin is one late pleistocene marker stratum in China.In order to reveal the origin and palaeoenvironment of the loess in Zhaitang basin the texture and structure and grain size of the loess and its carbonate and ferromanganese aggregate in this area are studied.The result shows that the texture and structure and grain size of the loess in Zhaitang basin are similar to those of loess on the middle reach of the Huanghe River.They are of eolian deposition.But the lishi loess in Zhaitang basin is different from the loess on the middle reach of Huanghe River in that it was subject to multiple proluvial deluvial processes in its deposition process.The Malan loess were also subject to several congeliturbations,indicating that the temperature in some stages of the loess formation process in Zhaitang basin was comparatably low.
出处
《北京地质》
1998年第1期1-10,共10页
Beijing Geology
关键词
北京
斋堂盆地
黄土结构
古环境
晚更新世
地层
Beijing,Zhaitang basin,lexture of loess,palaeoeviroment,Malan loess,Lishi to laess.
