caa a22 4500 475813359 CHVBK 20180406123803.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/s000240050008 doi (NATIONALLICENCE)springer-10.1007/s000240050008 Evolution of the Gouge Particle Size Distribution: A Markov Model [Elektronische Daten] [G. Ozkan, P. J. Ortoleva] —The hydrologic and mechanical properties of faults are determined by their internal structures and zoning due to fracturing, grain breakage and diagenesis. The proposed model in this study is a first step in the development of a more complete model of fault internal structure. It describes the evolution of the gouge particle size distribution (PSD) with shear induced grain breakage within a small, assumed uniform volume element. A Markov formalism is applied for binary breakage within each time step over the many time steps constituting the evolution. The particle size, strain- and stress-dependent breaking probability is constructed based on physical arguments and data on natural and simulated gouge PSDs. The model is calibrated by using the results of on Ottawa sand PSD experiments. A perfect fit is obtained between experimental and numerically simulated PSDs for a range of normal effective stress (NES). Results of the numerical simulations capture the bimodal form of gouge PSD and also clearly define two different breakage mechanisms. The gouge development behavior makes a dramatic transition as the normal effective stress exceeds the grain crushing stress of the gouge mineral.¶For a more complete intrafault structure analysis, the interplay of diagenesis and the mechanics of grain breakage can be integrated into a single mechano-chemical model of the type presented here. The model proposed here has great potential for predicting the complex roles of faults as seals or fluid conduits. Birkhäuser Verlag Basel,, 2000 Key Words: Gouge, partial size distribution, cataclasis, grinding circuit nationallicence Ozkan G. Laboratory for Computational Geodynamics, Indiana University, Bloomington, IN 47405, U.S.A., e-mail: ortoleva@indiana.edu, US aut Ortoleva P. J. Laboratory for Computational Geodynamics, Indiana University, Bloomington, IN 47405, U.S.A., e-mail: ortoleva@indiana.edu, US aut https://doi.org/10.1007/s000240050008 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s000240050008 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ozkan G. Laboratory for Computational Geodynamics, Indiana University, Bloomington, IN 47405, U.S.A., e-mail: ortoleva@indiana.edu, US aut NATIONALLICENCE 700 1- Ortoleva P. J. Laboratory for Computational Geodynamics, Indiana University, Bloomington, IN 47405, U.S.A., e-mail: ortoleva@indiana.edu, US aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer