Reactive dissolution instability driven by chemical diffusion with applications to harzburgite reactive dissolution

Details Reactive dissolution instability driven by chemical diffusion with applications to harzburgite reactive dissolution Reactive dissolution instability driven by chemical diffusion with applications to harzburgite reactive dissolution

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30m..55l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 13, pp. 55-1, CiteID 1722, DOI 10.1029/2003GL017687

Physics

1

Mineralogy And Petrology: Igneous Petrology, Tectonophysics: Physics Of Magma And Magma Bodies, Volcanology: Magma Migration

Scientific paper

The morphological stability of a mineralogically sharp and planar dissolution front separating rock A from rock B during reactive dissolution in a multicomponent system was examined using a linear stability analysis. In the absence of melt flow, the underlining cause for the instability is chemical diffusion in the melt. The destabilizing chemical diffusion gives rise to a new class of morphological instability in which the maximum growth rate of the perturbation corresponds to the minimum wavelength of the porous system that is on the order of a few grain sizes. On the geological outcrop scale a chemical diffusion induced unstable dissolution front separating two rock units would appear diffuse. The diffuse boundaries between the harzburgite and dunite observed in ophiolites may be a result of such dissolution instability. When chemical diffusion is stabilizing the wavelength of the instability is larger and sharp lithological boundary can be preserved.

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