Earth and Planetary Sciences ETDs

Publication Date

Summer 7-15-2024

Abstract

Heterogeneous gas-solid reactions are suggested as a potential mecha-
nism for sequestering gaseous sulfur through the alteration of calcic wall
rocks. This study explores the concept of a “hierarchy of reactions” pro-
posed by Giggenbach (1987), outlining the interplay between gas components
and redox-related minerals in volcanic wall rocks. Mt. Pinatubo provides a
more felsic composition and more oxidizing conditions compared to previ-
ously studied volcanoes, Kudryavy and Erta Ale (Henley and Fischer, 2021),
and Lascar a more oxidizing case with a similar composition. By employing
thermodynamic models and synthetic melt experiments, evaluations of effi-
ciency of sulfur sequestration across the two case study volcanoes are made.
Water-rock ratio and oxygen fugacity are identified as key influences on sulfur
sequestration efficacy. Insights gleaned from this study not only contribute
to a deeper understanding of sulfur budgets supplied to volcanic systems, but
to eruption forecasting and gas emission modeling as well.

Degree Name

Earth and Planetary Sciences

Level of Degree

Masters

Department Name

Department of Earth and Planetary Sciences

First Committee Member (Chair)

Tobias P. Fischer

Second Committee Member

Jin Zhang

Third Committee Member

Adrian J. Brearley

Keywords

Sulfur Sequestration, Hierarchy of Reactions, Anhydrite, Pinatubo, Lascar

Document Type

Thesis

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