The Relative Roles of Boudinage and "Structural Slicing" in the Disruption of Layered Rock Sequences
1984; University of Chicago Press; Volume: 92; Issue: 4 Linguagem: Inglês
10.1086/628879
ISSN1537-5269
Autores Tópico(s)Geological and Geochemical Analysis
ResumoThe dominant micro- and mesoscopic structural features of many melanges, fault zones, and other disrupted rock sequences are anastomosing shear surfaces. These surfaces progressively dismember and isolate sections of stiffer lithologies within more ductile ''matrix" in a process referred to here as "structural slicing." This process is distinct from classical boudinage, and when recognized as such may provide a means for differentiating normal boudinaged schist and gneiss terranes from metamorphosed melanges. In many sheared melanges, structural slicing dominates over both sedimentary processes (olistostromal deposition, soft-sediment deformation) and other tectonic processes (folding, boudinage) in the formation of blocks and control of the overall melange geometry. This is true at all scales of observation, from the production of small clasts to the definition of kilometer-scale "knockers."
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