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Numerical modelling of pressure solution in sandstone, rate-limiting processes and the effect of clays

By
E. Gundersen
E. Gundersen
1
Fluid Rock Interaction group, Departments. of Geology & Physics, University of Oslo, P.O. Box 1047 Blindern 0316 Oslo
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D. K. Dysthe
D. K. Dysthe
1
Fluid Rock Interaction group, Departments. of Geology & Physics, University of Oslo, P.O. Box 1047 Blindern 0316 Oslo
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F. Renard
F. Renard
2
LGIT, CNRS-Observatoire, Université J. Fourier, BP 53,38041 Grenoble, France
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K. Bjørlykke
K. Bjørlykke
1
Fluid Rock Interaction group, Departments. of Geology & Physics, University of Oslo, P.O. Box 1047 Blindern 0316 Oslo
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B. Jamtveit
B. Jamtveit
1
Fluid Rock Interaction group, Departments. of Geology & Physics, University of Oslo, P.O. Box 1047 Blindern 0316 Oslo
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Published:
January 01, 2002

Abstract

Pressure solution is an efficient mechanism for ductile deformation and local mass transport in the upper crust. In this paper we model pressure solution as a mechanism involving four steps: (1) dissolution at the grain contacts; (2) diffusion of solutes through fluid films at the contact between two grains; (3) transport of solutes by diffusion through the pore fluid into other adjacent open pores; and (4) precipitation on the surface of grains at their contact with the pore fluid. In this study we constrain under which conditions pressure solution is limited by one of the four processes: dissolution; contact diffusion; precipitation; and global diffusion. From our model of pressure solution, based on thermodynamic relationships we derive three dimensionless numbers which represent the competetion between the four mentioned processes. With these numbers we can define the crossover from a situation where one process acts as the limiting process to a new situation controlled by another process. We also see how the different rate-limiting processes influence the amount of mass transported during the compaction process. In addition we study the effect of clays, as it has been suggested that these minerals speed up the rate of pressure solution. We propose two models, a chemical related and a mechanical model for how the clay particles may affect the dissolution process of quartz.

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Contents

Geological Society, London, Special Publications

Deformation Mechanisms, Rheology and Tectonics: Current Status and Future Perspectives

S. de Meer
S. de Meer
Utrecht University, The Netherlands
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M. R. Drury
M. R. Drury
Utrecht University, The Netherlands
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J. H. P. de Bresser
J. H. P. de Bresser
Utrecht University, The Netherlands
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G. M. Pennock
G. M. Pennock
Utrecht University, The Netherlands
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Geological Society of London
Volume
200
ISBN electronic:
9781862396081
Publication date:
January 01, 2002

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