Petrological studies of volcanic ash from Sakurajima volcano in 2013, Southern Kyushu, Japan

2nd Transdisciplinary Research on Environmental Problems in Southeast Asia

地球科学;生态环境科学

Kurniawan, Idham Andri^1,3 ; Sakakibara, Masayuki^1,2 ; Suparka, Emmy^3

Department of Earth Science, Graduate School of Science and Engineering, Ehime University, 2-5 Bunkyo-cho, Matsuyama

790-8577, Japan^1

Faculty of Collaborative Regional Innovation, Ehime University, Japan^2

Department of Geology Engineering, Faculty of Earth Science and Technology, Bandung of Institute Technology, Jl Ganesha 10, Bandung

40132, Indonesia^3

关键词: conduit magma;    Crystallization process;    Degassing process;    Eruptive activity;    Magmatic process;    Melt compositions;    Microcrystallization;    Volcanic activities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/71/1/012008/pdf
DOI  :  10.1088/1755-1315/71/1/012008

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Many petrological studies of volcanic rocks have attempted to better predict future volcanic activity. In this study, we examined volcanic ash samples from Showa Crater in Sakurajima, Japan, which were erupted from January to October 2013. This study was used two types of juvenile material; black vesicular volcanic rock (BVVR) and black non-vesicular volcanic rock (BNVVR) to determine the variable of magmatic processes in the magma conduit during the 2013 eruption. We divided the duration into three periods such as January to April, April to July, and July to October based on the variable tendency of SiO2contents and volume abundance of the interstitial glasses in BVVR and BNVVR. The estimated melt compositions demonstrate that the variability of SiO2contents and volume abundance of microcrystal in the groundmass (BVVR and BNVVR) over time were caused by micro-crystallization processes. The estimated of water contents and vesicle volume shows the influence of degassing process in the rock forming. Also, the correlation of petrological features with the number of eruptions and eruptive volumes, exhibit the variable of magma supply into conduit in each period. Consequently, careful monitoring of the petrological features of erupted materials may provide useful constraints on future eruptive activity and thereby assist in the mitigation of volcanic hazards.