Skip to main content Accessibility help
×
Home

Fibre growth in wet salt aggregates in a temperature gradient field

  • Bas den Brok (a1), Cees Passchier (a1) and Michel Sieber (a1)

Abstract

Intense fibrosity develops in wet porous NaCl crystal aggregates (grain size 250–500 µm) held in a temperature (T) gradient field (0.5–4°C/mm) at temperatures between 20 and 50–60°C. In situ microscopic observation of the process shows that fibre growth is associated with T-gradient driven motion of tiny gas (air, water vapour) bubbles present in the saturated intercrystalline aqueous NaCl solution. Gas bubbles move through the intercrystalline pore fluid into the cold direction. They only move if they are next to an NaCl crystal; bubbles that are ‘free’ do not move. Each bubble is ‘pushed’ into the cold direction by a growing crystal fibre of the same diameter as the bubble itself. Fibres apparently grow due to oversaturation of the NaCl solution at the hot side of the gas bubble. Crystals dissolve at the cold side of the gas bubbles, apparently by undersaturation of the NaCl solution there. Thus, bubbles dissolve their way through NaCl-crystals and aggregates. Intense fibrosity develops within weeks.

Copyright

References

Hide All
Anthony, T.R. and Cline, H.E. (1972) The thermomigration of biphase vapor-liquid droplets in solids. Acta Metallurgica, 20, 247–55.
Bons, P.D. and Jessell, M.W. (1997) Experimental simulation of the formation of fibrous veins by localised dissolution-precipitation creep. Mineral. Mag., 61, 5363.
Passchier, C.W. and Trouw, R.A.J. (1996) Microtectonics. Springer-Verlag, Berlin Heidelberg, 289 pp.
Ramsay, J.G. (1980) The crack-seal mechanism of rock deformation. Nature, 284, 135–9.
Ramsay, J.F. and Huber, M.I. (1983) The Techniques of Modern Structural Geology, Volume 1: Strain Analysis. Academic Press, London, 307 pp.
Spiers, C.J., Peach, C.J., Brzesowsky, R.H., Schutjens, P.M.T.M., , Liezenberg, J.L. and Zwart, H.J. (1989) Long-term rheological and transport properties of dry and wet salt rocks. European Communities - Commission, Nuclear Science and Technology Series, EUR 11848.
Urai, J.L., Williams, P.F. and van Roermund, H.L.M.V. (1991) Kinematics of crystal growth in syntectonic fibrous veins. J. Struct. Geol., 13, 823–36.
Wilcox, W. R. (1969) Anomalous gas-liquid inclusion movement. Industrial and Engineering Chemistry, 61, 76–7.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed