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Related Experiment Video

Updated: Jul 16, 2025

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

Phases in fine volcanic ash.

Adrian Hornby¹, Esteban Gazel², Claire Bush³

¹Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA. ahornby@cornell.edu.

Scientific Reports

|September 21, 2023

Summary

This summary is machine-generated.

Volcanic ash composition changes with grain size, impacting atmospheric transport. This study provides a dataset and regressions to better estimate ash phase proportions and density for improved climate modeling.

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Area of Science:

Geochemistry
Volcanology
Atmospheric Science

Background:

Volcanic ash impacts climate, ecosystems, and health, but its composition and size-dependent properties are poorly understood.
Existing datasets lack detailed phase information for ash sizes relevant to atmospheric transport and widespread effects.
Understanding ash composition is crucial for accurate modeling of volcanic impacts.

Purpose of the Study:

To characterize the phase composition of size-separated volcanic ash fractions.
To investigate how phase composition varies with grain size, tectonic setting, and bulk chemistry.
To develop methods for estimating ash phase proportions and density with limited data.

Main Methods:

X-ray diffraction analysis of 40 ash samples from VEI 2-6 eruptions.
Size separation of ash into fractions.
Statistical analysis including regression modeling.

Main Results:

Fine ash (<45 μm) shows increased crystalline silica and salts, decreased glass and iron oxides.
Arc and intraplate samples are distinguished by feldspar and clinopyroxene fractions.
Regressions were developed to estimate glass and major crystal phase proportions.
Pore-free ash density is well-estimated by clinopyroxene + Fe-oxide fraction, differing between intraplate and arc samples.

Conclusions:

This study provides a valuable dataset for understanding volcanic ash phase composition and its variability.
The developed regressions and density estimations improve constraints on atmospheric and environmental ash budgets.
Accurate ash characterization is essential for refining models of explosive volcanism's impact on the Earth system.