Direct Observations of the Coupling between Quartz Dissolution and Mg-Silicate Formation

De Ruiter, Lisa
Putnis, Christine V.
Hövelmann, Jörn
King, Helen E.
Austrheim, Hakon

Publication date

January 2019

Abstract

Although quartz is a stable mineral at Earth surface conditions, field samples have shown its rapid dissolution in combination with the precipitation of Mg-silicate phases. Atomic force microscopy (AFM) experiments were performed to investigate the dissolution of quartz and the precipitation of secondary phases in high-pH, Mg-rich solutions both in situ and ex situ. Experiments were conducted at room temperature with varying MgCl 2 or MgSO 4 concentrations (0.1-100 mM), pH (8.9-12) and ionic strength (<1-530 mM). The results suggest that quartz dissolves by the removal of nanoparticles on the time scale of minutes, and that a nanometer-scale gel-like layer of amorphous silica forms on the quartz surface and is thicker at higher pH. During t...

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Direct Observations of the Coupling between Quartz Dissolution and Mg-Silicate Formation

Abstract

Extracted data

Direct Observations of the Coupling between Quartz Dissolution and Mg-Silicate Formation

Abstract

Extracted data

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