Mathematical Geosciences

, Volume 44, Issue 5, pp 595–617 | Cite as

Spatial Statistical Properties of Pressure Solution Seams in Clastic Rocks in Southwest Ireland



Length, height, thickness and spacing measurements of pressure solution seams at outcrop, hand sample and thin section scale were taken from clastic rocks located in the southwest of Ireland. The lengths and spacings of pressure solution seams have similarly shaped (approximately log-hyperbolic) distributions at the observed scales suggesting that length and spacing distributions are scale-independent over the scales studied with a fractal dimension in the range of 1.4 to 1.6. Pressure solution seam lengths and thicknesses are related by a power-law and their spacings have a linear relationship to bed thickness. Although pressure solution seams are often considered as anticracks (forming under the same remote stresses as joints, but with opposite sign) we describe how the mechanism of pressure solution differs substantially from that of jointing. We use an existing mechanical model to show that stresses around pressure solution seam tips are much lower than those for joints under equal but opposite loading conditions. Pressure solution seams also have a decreasing tendency to lengthen as they grow, which is reflected in their length distributions. We propose that pressure solution seams, unlike joints, do not reach fracture saturation spacing because of transverse coalescence.


Pressure solution seam statistics Pressure solution seam/joint comparison Fracture self-similarity 



Thanks go to Pat Meere and Chloe Parker of University College Cork and Chris Wilson and Vanessa Nenna of Stanford University for their assistance and discussion during fieldwork. We are also grateful to Jef Caers and Alexander Boucher for their assistance with the processing of statistical data. Improvements to the manuscript suggested by John Walsh and one anonymous reviewer were very much appreciated. This work was funded by the Stanford Rock Fracture Project and by a Levorsen Grant from Stanford School of Earth Sciences.


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Copyright information

© International Association for Mathematical Geosciences 2012

Authors and Affiliations

  1. 1.Rock Fracture Project, Department of Geological and Environmental SciencesStanford UniversityStanfordUSA

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