Structural Controls on Shallow Cenozoic Fluid Flow in the Otago Schist, New Zealand

Figure 2

Structural data from Akatore Creek (left column) and Bruce Rocks (right column). All stereonets are equal-area, lower hemisphere. (a, b) Metamorphic foliation (Jurassic/Triassic). (c, d) exhumation joints (late Cretaceous). (e, f) Small-displacement brittle faults containing carbonate veins and carbonate-cemented fault breccias. (g) Paleostress analysis performed on ten small-displacement faults using WinTensor: three N-dipping dextral faults and seven S- to SW-dipping sinistral faults. The calculated orientations of the three principal stress axes are shown, and the associated uncertainties as the red ellipses.