They present findings on the structural geology of dextral fault
zones in the trough, basic analysis and fault activity, and changes after initiation of the San Jacinto and San Felipe fault zones.
Langdon and Hall (1994) interpreted the tectonic structure of the region to be a wrench system involving the major NE-trending faults with minor parallel and cross-cutting dextral fault
arrays and shear zones (i.
One WNW-striking dextral fault plane with a similar fabric was also identified (Fig.
2b, stereonet 5; Table 1) is truncated by a less dense network of dextral fault planes with similar fabrics striking NW (Fig.
These faults are kinematically compatible with large NW-striking dextral faults in eastern Gaspe, and suggest that these structures reflect a widespread Alleghanian paleostress system that probably affected the entire Quebec Appalachians.
Well exposed latest Devonian--earliest Carboniferous plutons occur along two dextral fault
strands and an en echelon transition zone between them in the southern part of the Cobequid Shear Zone.
The largest measured displacement is 20 m in a dextral fault striking 080[degrees] in the phyllonite zone on the eastern side of Third Machias Lake.
The episode 2 conjugate system typically has a set of dextral faults oriented around 010[degrees]-020[degrees], and a sinistral set oriented 060[degrees]-070[degrees] (Fig.
Normal, sinistral, and dextral faults
in the same orientations affect both Cambrian and Pennsylvanian rocks.