地质科技情报2018，Vol.37Issue(4)：83-89,7.DOI:10.19509/j.cnki.dzkq.2018.0410
河北丰宁黄土粒度特征及其环境意义
Grain-Size Properties and Their Environmental Significance of Fengning Loess, Hebei Province
摘要
Abstract
In this paper, we analyse the grain size of Fengning loess, systematically.The results show that: (1) the Fengning loess was mainly composed of coarse silt particles (32-63μm) and sand particles (>63μm) , with the average size larger than that of Loess Plateau.Base on the grain-size characteristics of Fengning loess, we suggest that the content of sand particles (>63μm) was controlled by not only the changes of Asian winter monsoon, but also the changes of Hunshandake Desert′s boundary. (2) vertically, the grain size distribution of Fengning loess exhibits an abrupt shift at 236 cm (61.5 ka) , with the increasing percentage of sand particles (>63μm) , and larger average grain size.Based on the previous studies, we suggest that this shift should mainly result from the expansion of Hunshandake Desert, with the global climate transition from warm and humid to cold and dry.关键词
河北丰宁/黄土沉积/粒度分析/沙漠扩张Key words
Fengning/Hebei Province/loess deposits/grain-size analysis/desert expansion分类
地质学引用本文复制引用
姜高磊,刘林敬,毕志伟,赵华,毛欣..河北丰宁黄土粒度特征及其环境意义[J].地质科技情报,2018,37(4):83-89,7.基金项目
国家自然科学基金项目(41602194) （41602194）
中国地质科学院基本科研业务费专项经费(YWF201411) （YWF201411）
