Dynamics of exrtrusive dome growth and variations in chemical and mineralogical composition of Young Shiveluch andesites in 2001–2013

详细信息    查看全文

• 作者：N. V. Gorbach ; M. V. Portnyagin ; T. M. Philosofova
• 刊名：Journal of Volcanology and Seismology
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：10
• 期：6
• 页码：360-381
• 全文大小：
• 刊物主题：Geophysics/Geodesy; Geochemistry; Geology;
• 出版者：Pleiades Publishing
• ISSN：1819-7108
• 卷排序：10

文摘

This paper discribes characteristic features of the extrusive dome growth of the Young Shiveluch Volcano in 2001–2013 and analyzes variations in the chemical and mineralogic composition of magmas erupted during this period. It is shown that, compared with the earlier phases in the dome growth during 1980–1981 and 1993–1995, the andesites that were erupted in the 2000s are less homogeneous in bulk composition, crystal contents and contain phenocrysts, which differ in composition and the conditions of crystallization. These compositional feature of rocks are interpreted as resulting from convection in a shallow magma chamber, with the convection being caused by the arrival of a fresh portion of deep magma.