腾格里沙漠东南缘晚第三纪古风成砂及其环境  

Late Tertiary Eolian Sand Accumulation and Its Environment in the Southeastern Marginal Tengger Desert

作　　者：闫满存[1] 董光荣[1] 陶贞[1] 涂真 

机构地区：[1]中国科学院兰州沙漠研究所

出　　处：《中国沙漠》1992年第3期10-15,共6页Journal of Desert Research

摘　　要：通过对地层、沉积构造、粒度、石英砂表面微结构及动物群、孢粉组合的分析表明,晚第三纪期间腾格里沙漠东南缘及附近地区曾呈现类似现代风沙迁移、堆积的风沙地貌过程。当时气候炎热干旱,干湿季变化明显,生物气候带为亚热带疏林草原甚至荒漠草原。Analytical results of stratigraphy, sedimentary structure, grain size, quartz sand microtextures, fauna, pollen spore etcrevealed that there has been a series of eolian processes from sand transportation to accumulation by wind during the Neogence period, which are similar to that of today in the southeastern marginal Tengger Desert. In addition, a great number of calcareous crusts and nodules in eolian sand dunes showed that the climate in the area at that time were dry and hot, with an obvious fluctuations of arid and humid climate, and the bioclimatic zones shifted from the spare wood steppe of Sub-trotropic zone to desert steppe.

关 键 词：晚第三纪 古风成砂 沉积 环境 

分 类 号：P931.3[天文地球—自然地理学]