Magmatic overpressures, volatile exsolution and potential explosivity of fissure eruptions inferred via dike aspect ratios.

ABSTRACT: Buoyant magmas abundant in exsolved volatiles (bubbles) drive the rapid upward-propagation of feeder dikes from magma chambers. The consequence of a feeder dike reaching the surface can result in an explosive volcanic eruption depending, partly, on the retention of volatiles. Therefore, timely detection of the vesicularity and overpressure of the magma during feeder dike ascent is critical for the prediction of the explosivity of any future eruption. In this study, we evaluated the explosivity of eruptions based on field investigations of the erupted products and the overpressure of magma in the conduit based on the dimensions of exposed feeder dikes. We found a positive correlation between the explosivity of eruptions and the magma overpressure generated in the conduit during recent fissu

SUBMITTER: Geshi N 

PROVIDER: S-EPMC7287056 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature