학술논문
Differentiation of eruptive magma in the late Miocene Shirasawa Caldera and present geothermal reservoir / 中新世後期白沢カルデラの噴出マグマの分化と現世の地熱流体貯留層
Document Type
Journal Article
Author
Source
日本地熱学会誌 / Journal of the Geothermal Research Society of Japan. 2017, 39(1):25
Subject
Language
Japanese
ISSN
0388-6735
1883-5775
1883-5775
Abstract
These results suggest that the caldera-forming magma was generated at a depth of 10-20 km, and magma chambers were formed at 1-11 km due to gravitational equilibria. Subsequent fractionation of plagioclase and quartz led the release of volatiles, which promoted eruptions and formed the Shirasawa Caldera. It is expected that the fluids in the melt were liberated during the ascent and cooling of the magma chambers, and were trapped at depth, which can be detected by the present geophysical observations.