- Recommended articles
- March 21, 2025
[Frontier Letter] The theoretical basis for textural indices of eruption dynamics: review and new conceptual models
The crystal and vesicle textures of eruption products record their histories of change of physical state from the formation at depth to the quench near the surface. Development of suitable textural indices to decipher the histories and the applications to real products can expand our knowledge on the migration of the magma to the surface. As eruption products inevitably experience the nucleation of crystal and bubble, I illustrate the basic understanding of nucleation processes of crystal and bubble in terms of classical nucleation theory. The topics cover homogeneous nucleation, heterogeneous nucleation, nucleation limits and second nucleation under cooling or/and decompression of magmas. I discuss their roles in interpreting matrix-crystal and -bubble number densities as indices for changing rates temperature or pressure in conduits. Using the conceptual models for pheno-textures, I propose CSD slope of phenocryst and volume of pheno-bubble as indices to estimate magma supply rate from depth and eruption volumes in Sakurajima historical eruptions, respectively.
- Toramaru. (2025): The theoretical basis for textural indices of eruption dynamics: review and new conceptual models. Earth Planets Space 77:27, https://doi.org/10.1186/s40623-025-02146-4
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