Fig. 3
From: Magnetic petrology of pumice fall deposits of the 1783 eruption of Asama volcano, Japan
Representative back-scattered electron images (a–d) and electron probe analyses (e, f) of opaque minerals in the pumice fall deposits. a Euhedral homogeneous TM (type I) in volcanic glass. b Bleb-shaped TH associated with TM (type I). c TM–Opx symplectite (type II). d Globular pyrrhotite is included in orthopyroxene. TM titanomagnetite, TH titanohematite, Opx orthopyroxene, Ol olivine, Po pyrrhotite. e FeO-1/2Fe2O3–TiO2 ternary diagrams showing chemical compositions of Fe–Ti oxides. The dashed and dotted lines indicate solid solutions of TM and TH, respectively. f Representative elemental maps of TM (type I) for Fe, Ti, Al, and Mg. The color bar beside each map indicates the relative intensity