Figure 5
From: Shallow magma pre-charge during repeated Plinian eruptions at Sakurajima volcano
Back scattered electron images of a representative plagioclase phenocryst from the 1914 Plinian pumice. The plagioclase has a calcic core and a thick (~200 μm) relatively sodic rim with oscillatory zoning. The outermost homogeneous zone with a thickness of >10 μm (typically 20–30 μm) was analysed for the hygrometer calculation.
