Dynamics of exrtrusive dome growth and variations in chemical and mineralogical composition of Young Shiveluch andesites in 2001–2013
Dynamics of exrtrusive dome growth and variations in chemical and mineralogical composition of Young Shiveluch andesites in 2001–2013
复制标题
2001-2013 年年轻 Shiveluch 安山岩的突出穹顶生长动态以及化学和矿物成分的变化
DOI：
10.1134/s0742046316060038
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发表时间：
2016
影响因子：
0.7
通讯作者：
T. Philosofova
中科院分区：
文献类型：
--
作者：
N. Gorbach;M. Portnyagin;T. Philosofova
本文描述了2001-2013年年轻希韦鲁克火山喷出穹隆生长的特征，分析了该时期喷发岩浆的化学和矿物学组成变化。结果表明，与1980 ~ 1981年和1993 ~ 1995年圆顶发育早期相比，2000年代爆发的安山岩在体积组成、晶体含量等方面均不均匀，且含有斑晶，其组成和结晶条件存在差异。岩石的这些成分特征被解释为浅层岩浆房中对流的结果，而对流是由深部岩浆新鲜部分的到来引起的。
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.