摘要
第四纪时期,北京西山潭柘寺地区没有发生过任何山地冰川作用。所谓的冰川遗迹、冰碛、冰水沉积及各种冰蚀地貌,实际上是不存在的。因此,所谓的冰期划分也都是不可靠的。在更新世冰期阶段,北京西山属冰缘环境,而非冰川环境。
In 1991 and 1992, the author observed and inspected the so-called 'glacial evidence' in Tanzhesi area. But the facts we found show that the Shui's glacial hypothesis is untenable. The reasons are as follows:
1. The so-called ancient cirque and glacial trough and glacial U-shaped valley et al. in the shui's report bear no any resemblance to glacial cirque and glacial U-shaped valley, and no evidence there for former glaciation can be found. They are periglacial eroded depressions and river valley.
2. The so-called glacial boulders widely distributed in Tanzhsi region are gravel formation on the Neocene planation surface, debris flow deposits in pediment area, and eluvial-deluvial deposit in that region.
3. Sporo-pollen composition analysis, the existance of periglacial phenomena, and thermoluminescene dating show that a savanah steppe or tundra environment prevailed there in the Tanzhesi area during Quaternary period.
From the evidence on the changes of botany, microshaped feature of quartz grain size and periglacial climate on the basis of the permafrost it is inferred that no glaciation occurs ever in the Tanzhesi area of Western Mountain, Beijing. Therefore, periglacial environment existed there rather than glaciers.
出处
《冰川冻土》
CSCD
北大核心
1993年第4期574-581,共8页
Journal of Glaciology and Geocryology
关键词
冰川
第四纪
古环境
北京
沉积物
Quaternary, periglaciation, deposits, paleoenvironment, Beijing
