The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

Tectonic and kinematic study of a strike-slip zone along the southern margin of Central Ovda Regio, Venus: Geodynamical implications for crustal plateaux formation and evolution

“…5a), a tectonic feature very similar to the R-P Riedel systems ordinarily described in Earth strike-slip faults (Davis et aI., 2000;Kim et aI., 2003;Faulkner et aI., 2003), and in experimental works as well (Ahlgren, 2001;Ferill et aI., 1997;Tchalenko, 1970). In de tail, the faults feature a set of en echelon fractures trending N125° that we interpret as R-type Riedel fractures, and a less developed set of fractures trending N93 ° that can be identified as P-type Riedel fractures (Fig.…”

“…Thus, the set of N125°-trending fractures could be the P-type set and the set trending N93° could be the R-type set, which would imply a sinistral movement. We have finally rejected this interpretation because the N125° fracture set is more de veloped (i.e., it shows more fractures) than the N93° frac ture set, and the experimental works indicate that R frac tures always dominate over P fractures (Tchalenko, 1970;Ahlgren, 2001). This is not however a strong argument con sidering that the N93 ° fracture set is oriented near the radar beam direction which implies a low backscatter return, so the development of this set could be underestimated because of the radar characteristics.…”

“…5b). This tectonic pattern points to an evolved Riedel zone (Ahlgren, 2001), which is expected to develop as first a set of en echelon R type fractures, later connected by R' -type fractures. P-type fractures would be generated at the closing stage (Fig.…”

Shallow-generated damage within non-planar strike-slip fault zones: role of sedimentary rocks in slip accommodation, SW Holy Cross Mountains, Poland

“…Moore and Byerlee 1992;Ahlgren 2001;Katz et al 2004;Skarbek et al 2012;Beeler et al 2013, Wei et al 2013, we suggest that the slip of the Mieczyn and Gnieździska-Brzeziny faults was accommodated by two modes of slip behaviour: shallow stable sliding or aseismic creep, and stick-slip or seismic. The results of structural observations reveal that both the porous sandstones and the low-porosity limestones display evidence of aseismic and seismic microevents of faulting that has been recorded in rocks within different deformation patterns facilitated most likely by rock fabric and porosity.…”

Transform Fault

“…These steps are illustrated in Fig. 10 (see Tchalenko, 1970 and the synthesis in Şengör, 1995; also see Ahlgren, 2001;Katz et al, 2004). As shearing begins, the associated strain is initially taken up along a broad zone.…”