摘要
冀西北坝上全新世岩性四分性明显 ,早期堆积物为洪、冲积并存 ,分布较少 ,中期以冲积为主 ,分布较广 ,后转为风积 ,晚期为洪积、洪冲积、沼泽堆积。相应的气候则由较暖较干、温暖湿润、温暖较干到温凉较干四个主要变化过程。
The Holocene of Bashang can appreciably be divided into 4 lithologic assemblages, In early stage, the only a few accumulation is mainly deluviation alluviation, In middle stage, there is widespread accumulation, is mainly alluviation, then change eolian deposit, In last stage, the accumulation is mainly deluviation,deluviation alluviation and marsh deposit the main change process of the relevant climate include warmer drier, warm humid,warm drier and cool dry?
出处
《北京地质》
2002年第2期23-27,共5页
Beijing Geology
关键词
全新世堆积
植被
气候
河北
环境演变
the Holocene accumulation
vegetation
climate
Bashang
