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Volumetric Bands

Deformation bands that lack evidence of macroscopic shear offset form predominantly by volumetric deformation and are therefore called volumetric deformation bands. The volume change may be either positive or negative (Du Bernard et al., 2002; Sternlof et al., 2005) and is expressed by a porosity increase for dilation bands and a porosity decrease for compaction bands, respectively. Aydin et al. (2006) envisioned that there exists an entire spectrum of bands from pure dilation to pure compaction. It has also been suggested that bands with higher porosity may form by the concentration and coalescence of pores without a significant change in the overall volumetric strain (Mukhamediev and Ul'kin, 2011).

Types of Volumetric Bands:
Compaction BandsDilation Bands
Reference:

Aydin, A., Borja, R., Eichhubl, P., 2006. Geological and mathematical framework for failure modes in granular rock. Journal of Structural Geology 28 (1): 83-98.

Du Bernard, X., Eichhubl, P., Aydin, A., 2002. Dilation bands: a new form of localized failure in granular media. Geophysical Research Letters 29 (24): 2176 doi: 1029/2002GLO15966.

Mukhamediev, Sh.A., Ul'kin, D.A., 2011. Formation of systems of incompact bands paralllel to the compression axis in the unconsolidated sedimentary rocks: A model. Izvestiya, Physics of the Solid Earth 47 (10): 886-901.

Sternlof, K.R., Rudnicki, J.W., Pollard, D.D., 2005. Anticrack inclusion model for compaction bands in sandstone. Journal of Geophysical Research 110: B11403, doi:10.1029/2005JB003764.



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