摘要
本文从岩石学角度论证岩石特征与丹霞地貌发育的关系,指出中等岩石成分成熟度、组分有一定可溶性及中等成岩强度的岩石特征有利于丹霞地貌发育。
The Danxia group of Eogene in the Jinjiling district of north Guangdong is a suit of red rock series in which the rock beddings are seen clearly and the bed thicknesses change cyclically. The dominant rock of the group is calcareous feldsparthic quartz sandstone with purplish red colour. The rock is mainly characterized by medium compositional maturity, medium diagenetic strength and certain dissolubility. Because of the characteristics, the rock with fractures is weathered faster than that without fracture when the water penetrates through the fractures, so some distinctive Danxia landscapes such as deep crevices and narrow channels are developed along the fractures. The formation of the bedded-caves is related to a kind of feldsparthic quartz sandstone that containes more calcite and more diagenetic fractures. The development of microlandforms are mainly controlled by the lithological characteristics of the rock. Sheet erosion, dissolution and sedimentation play an important role in creating the micro-Danxia landform.
出处
《热带地理》
北大核心
1992年第2期133-140,T001,共9页
Tropical Geography
基金
国家自然科学基金
关键词
丹霞地貌
成分
成熟度
成岩
强度
Danxia landform
Compositional maturity
Diagenetic strength
