Fig. 5: Petrographic and compositional features of minerals and glassy matrix in juvenile products of both paroxysms. | Nature Communications

Fig. 5: Petrographic and compositional features of minerals and glassy matrix in juvenile products of both paroxysms.

From: Uncovering the eruptive patterns of the 2019 double paroxysm eruption crisis of Stromboli volcano

Fig. 5: Petrographic and compositional features of minerals and glassy matrix in juvenile products of both paroxysms.

a–d Backscattered images of minerals and groundmasses showing disequilibrium events evidenced by dissolution surfaces and crystal rims with variable textures and compositions: (a) corroded crystal of zoned plagioclase with a spongy textured corona; (b) clinopyroxene with Fe-rich corroded core (Fs18) and Fe-poor euhedral rim (Fs7.4-8.2), including a partially resorbed olivine (Fo66) with Mg-rich rim; (c) sharp contact between LP (dark-gray) and HP (light-gray) glasses in 3 July products; (d) highly mingled glass in 28 August products. e, f Chemical composition of glassy matrices plotted in CaO vs. K2O and CaO/Al2O3 vs. FeO/MgO diagrams. The compositional field of HP, LP, and mixed HP-LP products that erupted in the past two decades are reported for comparison (published10,13,19,69 and unpublished data).

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