论文摘要
Changbaishan volcano is the most active volcano in China. The eruption of Changbaishan volcano in 969±20 AD generated a total tephra volume of 100-172 km3. Based on the particulate size description analyser and scanning electron microscopy, the grain size distribution and morphological characteristics of coarse tephra detritus between 1φ～5φ were discussioned. And the relationship between coarse tephra detritus and volcanic sedimentary facies were analyzed. At the near source area, the size distribution characteristics of coarse tephra detritus is similar with the fallout deposit. Itis single peak and the slopes on both sides of the peak is slower. It has larger area. It shows that coarse tephra detritus in a wide distribution of 2φ to 5φ. Scanning electron microscopy of volcanic debris is developed by piping porosity. The sharp is most chicken bone particles with sharp edges. The distribution characteristics of thebase-surgecoarse tephra detritus particle size is the peak and higher on the right. It has a large number of granular non-porous crumb particles besides chicken bone particles with sharp edges. Two Lahar deposits occurr in the primaryand secondary after the eruption of Changbaishan. The Lahar deposit contains a large amount of primary volcanic debris. Its coarse tephra detritus size distribution is concentrated and large. The sharp is most chicken bone particles with sharp edges and granular non-porous crumb particles.It is similar with the base-surge. The distribution of coarse tephra detritus in secondary Lahar is single peakand the slope on the left side is gentle. It’s slope on the right side is steep. Scanning electron microscopy basically only sees nonporous granular debris. We can distinguish between native volcanic eruption products, primary Lahar and secondary Lahar under the help of distribution characteristics and scanning electron microscopy of coarse tephra detritus.
论文目录
文章来源
类型: 国际会议
作者: WANG Wei,SHAN Xuanlong,YI Jian
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学
专业: 地质学,地质学,地球物理学
单位: College of Earth Sciences, Jilin University
分类号: P317;P512.2
DOI: 10.26914/c.cnkihy.2019.028310
页码: 66
总页数: 1
文件大小: 126k
下载量: 2