摘要
华南沿海常见的老红砂是第四纪晚期海岸带环境演变的产物,在重建区域气候和海平面变化历史方面具有重要意义.福建平潭海坛岛是华南沿海老红砂分布最典型的地区之一.以海坛岛北侧冲沟侵蚀暴露的老红砂剖面为研究对象,通过系统采样进行粒度实验,从样品的频率曲线、概率累积曲线初步判别沉积物的搬运动力特征;通过对样品的粒度参数分析,并与内陆典型的沙漠砂、现代海滩砂、海岸沙丘砂、河流砂的粒度参数进行比较,综合判断确定了海坛岛君山北麓老红砂的沉积特征和沉积环境.结果表明,君山北麓海岸带老红砂以风力搬运为主,同时具有冲积、坡积的次生搬运性质,反映了海岸山麓带沉积环境的复杂性.沉积物粒度特征及其搬运动力的解释,既要有多个样品粒度参数的统计分析,也要和各地区古地理环境特点相结合.
In the south coast of China,the ＂Old Red Sand＂is a common product of coastal environmental evolution during the late quaternary,which is of great significance in the reconstruction of regional climate and sea level change history.Haitan Island of Fujian Province is one of the most typical distribution areas of＂Old Red Sand＂.The present work mainly focused on judging the sedimentary characteristics and sedimentary environment of＂Old Red Sand＂in north foot of Jun Mountain on the northeastern Haitan Island.On the basis of granulometric analysis on samples with high-resolution,the transportation dynamics is inferred from frequency distribution and probability accumulation curves of the ＂ Old Red Sand＂ on Dianshui Profile.By comparing the grain-size parameters of the ＂ Old Red Sand＂ with typical inland desert sand,modern beach sand,coastal dune sand and river sand,the sedimentary characteristics and sedimentary environment of the ＂Old Red Sand＂were obtained.The results show that：the ＂Old Red Sand＂in our study area is dominated by wind transportation and secondary transportation of alluvium and diluvium,implicating the complexity of the sedimentary environment in foothill belt off the coast.Besides,the interpretation of granulometric characteristics and transportation dynamics of the sediment requires statistical analysis on large quantities of samples in combination with regional ancient geographical environment characteristics.
出处
《华中师范大学学报（自然科学版）》
CAS
北大核心
2016年第1期142-150,共9页
Journal of Central China Normal University：Natural Sciences
基金
国家自然科学基金项目(41271031
41301012)
国家自然科学基金联合基金项目(U1405231)
福建省自然科学基金项目(2013J01153)
福建省科技厅公益类科研院所专项基金项目(2013R09)
关键词
老红砂
粒度特征
风力作用
次生搬运
福建海坛岛
Old Red Sand
granulometric characteristics
wind action
secondary transportation
Haitan Island of Fujian Province
