The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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AAPG Bulletin; Year: 2021; Issue: October DOI: 10.1306/04232120046
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Figure 15.
Kinematic indicators of veins on outcrop pavement along the Hoffmans Fault in Wolf Hollow, New York (for location, see black circle on Hoffmans Fault in Figure 2). (A) Restraining bend in vein (at label no. 4) where the vein is thinner at the right step than along the longer, northerly striking segments of the vein. The right-stepping restraining bend indicates left-lateral motion. View down onto outcrop pavement. Photograph by Robert Jacobi. (B) Releasing bends (rhombochasms) in a vein (at sites with arrows) wherein the vein is thicker at the right step than along the longer, more northerly striking segments of the vein. Right-stepping releasing bends indicate right-lateral motion. Photograph by Robert Jacobi. (C) Stereonet displaying orientations of veins and slickenfibers at a small outcrop in the ditch alongside the Wolf Hollow Road. The veins strike northerly (planes and poles to the veins), and one vein has a small drag fold of Utica Group shale along the vein (plane indicated by “left lateral from drag fold”). The slickenfibers plunge both along strike and downdip, indicating both strike-slip and dip-slip motion. The along-strike plunge is consistent with the releasing and restraining bend orientations.
Figure 15. Kinematic indicators of veins on outcrop pavement along the Hoffmans Fault in Wolf Hollow, New York (for location, see black circle on Hoffmans Fault in Figure 2). (A) Restraining bend in vein (at label no. 4) where the vein is thinner at the right step than along the longer, northerly striking segments of the vein. The right-stepping restraining bend indicates left-lateral motion. View down onto outcrop pavement. Photograph by Robert Jacobi. (B) Releasing bends (rhombochasms) in a vein (at sites with arrows) wherein the vein is thicker at the right step than along the longer, more northerly striking segments of the vein. Right-stepping releasing bends indicate right-lateral motion. Photograph by Robert Jacobi. (C) Stereonet displaying orientations of veins and slickenfibers at a small outcrop in the ditch alongside the Wolf Hollow Road. The veins strike northerly (planes and poles to the veins), and one vein has a small drag fold of Utica Group shale along the vein (plane indicated by “left lateral from drag fold”). The slickenfibers plunge both along strike and downdip, indicating both strike-slip and dip-slip motion. The along-strike plunge is consistent with the releasing and restraining bend orientations.