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Stability of a sodium chloride indenter contact undergoing pressure solution

¹ Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, New York 10964, USA, and Corporate Strategic Research, ExxonMobil Research and Engineering, 1545 Route 22E, Annandale, New Jersey 08801, USA
² Department of Environmental Sciences and Energy Research, Weizmann Institute, Rehovot 76100, Israel
³ Corporate Strategic Research, ExxonMobil Research and Engineering, 1545 Route 22E, Annandale, New Jersey 08801, USA
⁴ Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, New York 10964, USA

In situ observations of the contact between a halite indenter and a flat silicate plate immersed in saturated solution indicate that the indenter deforms in two sequential stages: the first involves rapid inward dissolution of the free faces around the edge of the contact accompanied by slow vertical convergence caused by vertical dissolution and the elastic response to the shrinking contact. The second stage consists of rapid vertical convergence by plastic flow complemented by removal of the flowed material by inward dissolution. The contact between the indenter and plate evolves into a dynamic network of steep channels and islands that moves about throughout the process. This study exhibits some of the advantages of confocal microscopy in observing dynamic processes.

Key Words: pressure solution • halite • plastic flow • grain contacts

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