福建海坛岛君山北麓老红砂的粒度特征及其环境意义

发布时间：2018-09-12 09:25

【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.
[Abstract]:Laohong sand is a product of the environmental evolution of the coastal zone in late Quaternary, which is of great significance in reconstructing the history of regional climate and sea level change. Pingtan Haitan Island in Fujian Province is one of the most typical areas in the distribution of old red sand along the South China coast. The Laohong sand profile exposed to gully erosion in the northern side of Haitan Island is taken as the research object. The particle size experiments are carried out through systematic sampling. The characteristics of sediment transport power are preliminarily distinguished from the frequency curve and probability accumulation curve of the sample. By analyzing the granularity parameters of the samples and comparing them with those of typical inland desert sand, modern beach sand, coastal sand dune and river sand, the sedimentary characteristics and sedimentary environment of Laohong sand in the northern foot of Junshan Mountain, Hitan Island are determined. The results show that the old red sand in the coastal zone of the northern foot of Junshan is mainly carried by wind force and has the secondary transport property of alluvium and slope which reflects the complexity of the sedimentary environment in the coastal foothills. The interpretation of grain size characteristics and transport power of sediments should be combined with the characteristics of paleogeographic environment in various regions as well as the statistical analysis of the granularity parameters of several samples.
【作者单位】：福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地;福建师范大学地理研究所;
【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)
【分类号】：P736.21

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