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Mineral dissolution and reprecipitation mediated by an amorphous phase

Journal article
Authors Matthias Konrad-Schmolke
R. Halama
R. Wirth
Aurélien Thomen
N. Klitscher
L. Morales
A. Schreiber
F. D. H. Wilke
Published in Nature Communications
Volume 9
ISSN 2041-1723
Publication year 2018
Published at Department of Earth Sciences
Department of Chemistry and Molecular Biology
Language en
Links https://doi.org/10.1038/s41467-018-...
Keywords reactive surface-area, subduction zones, replacement reactions, high-pressure, microstructure, precipitation, nucleation, interfaces, chemistry, mechanism, Science & Technology - Other Topics
Subject categories Mineralogy, Geochemistry

Abstract

Fluid-mediated mineral dissolution and reprecipitation processes are the most common mineral reaction mechanism in the solid Earth and are fundamental for the Earth's internal dynamics. Element exchange during such mineral reactions is commonly thought to occur via aqueous solutions with the mineral solubility in the coexisting fluid being a rate limiting factor. Here we show in high-pressure/low temperature rocks that element transfer during mineral dissolution and reprecipitation can occur in an alkali-Al-Si-rich amorphous material that forms directly by depolymerization of the crystal lattice and is thermodynamically decoupled from aqueous solutions. Depolymerization starts along grain boundaries and crystal lattice defects that serve as element exchange pathways and are sites of porosity formation. The resulting amorphous material occupies large volumes in an interconnected porosity network. Precipitation of product minerals occurs directly by repolymerization of the amorphous material at the product surface. This mechanism allows for significantly higher element transport and mineral reaction rates than aqueous solutions with major implications for the role of mineral reactions in the dynamic Earth.

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