The Types and Role of Stepovers in Strike-Slip Tectonics
Published:January 01, 1985
Atilla Aydin, Amos Nur, 1985. "The Types and Role of Stepovers in Strike-Slip Tectonics", Strike-Slip Deformation, Basin Formation, and Sedimentation, Kevin T. Biddle, Nicholas Christie-Blick
Download citation file:
Stepovers are fundamental features along strike-slip faults of various lengths. Two types of stepover between strike-slip faults are considered in this paper: (1) along-strike stepovers that are due to en echelon arrangement of faults in map view, and (2) down-dip stepovers that are due to en echelon arrangement of faults in cross section. Along-strike stepovers produce pull-apart basins und push-up ranges depending on the sense of stepover. Down-dip stepovers of both senses may produce strike-slip faults in orientations different from the initial major strike-slip faults that are arranged en echelon. Some possible mechanisms that produce stepovers and control the sense of stepover are (1) bending of initially straight faults. (2) faulting within a weak zone oriented slightly off a local failure plane. (3) segmentation of faults to accommodate curved fault traces. (4) horizontal slip across pre-existing extensional fractures or dip-slip faults that have steps. (5) a change of physical parameters such as elastic moduli and pore pressure, and (6) stress field resulting from fault interaction.
Figures & Tables
Strike-Slip Deformation, Basin Formation, and Sedimentation
This Special Publication is an outgrowth of a Research Symposium held at the 1984 joint meeting of SEPM and AAPG in San Antonio, Texas. In recent years a significant body of new geological and geophysical data on strike-slip basins had been acquired, and there had been significant progress in understanding the mechanisms by which basins form and deform in strike-slip settings. This volume emphasizes the relations between deformation patterns along strike-slip faults, the mechanisms by which basins form and the configuration of sedimentary facies within such basins.