マグマ供給系における深部二酸化炭素の輸送現象

Abstract

Carbon dioxide fluxing is a recently proposed process in which a large amount of CO2-rich vapour migrates in crustal magmatic systems. Such a proposal was derived from analytical studies on glass inclusions that have higher CO2/H2O ratios than those usually expected from a simple degassing process. The fluxing may be a universal phenomenon that occurs in various geological settings. However, its mechanisms, including the transport mode, duration and source, are still unclear. In this paper I review recent case studies on vapour transport in active volcanoes and discuss unsettled points and future studies.