Analysis of Basin-Range Structure, South-Central Oregon

Kinematic development and paleostress analysis of the Denizli Basin (Western Turkey): implications of spatial variation of relative paleostress magnitudes and orientations

“…This relationship is due to stress permutations between s 2 and s 3 , possible when magnitudes of s 2 and s 3 are very close, but not equal, to each other (Homberg et al, 1997). A similar pattern is also possible under conditions of triaxial strain (Donath, 1962;Reches, 1978;Krantz, 1988;Arlegui-Crespo and Simó n-Gó mez, 1997;Nieto-Samaniego and AlanizAlvarez, 1997) under which four sets of faults displaying orthorhombic symmetry may be developed (Reches, 1978). Since most of the s 1 directions are sub-vertical, other stresses are sub-horizontal and the structures are almost perpendicular to each other, stress permutation rather than triaxial strain is most likely to occur in this situation.…”

Wrench faults, pull‐apart basins, and volcanism in central Oregon: A new tectonic model based on image interpretation

“…The T M lineaments correlate closely with NNW and NNE striking normal fault scarps, forming a rhombic pattern (Donath 1962) which terminates northward against the Brothers Fault. Late Tertiary to Recent lacustrine, fluviatile, and aeolian tuffaceous deposits have accumulated in the hanging wall blocks of the normal faults (Walker et al 1967;Sammel 1980).…”

Preliminary report on the geology of the Lakeview uranium area, Lake County, Oregon

“…A combination of east-west extension and northwest-and southeast-trending couples that are related to these suspected transverse faults may explain the rhombic fracture system delineated by Donath (1962) for similar terrane near Summer Lake (fig-2), about 50 km north of the Lakeview uranium area. Because of the uncertainty of the mechanism or mechanisms that formed this broad and faulted regional warp ( fig.…”

“…Several specialized studies that bear on the geology of the region include that by Donath (1962) on interpretation of structural elements using principally geophysical and photogeologic techniques and that by MacLeod and others (1976) on the age and major oxide chemistry of rhyolites of southeast Oregon and their import on geothermal resource potential. The author was ably assisted in the field and briefly in the office by David Horley (summer 1978; spring 1979) and by James M. Baker (summer 1977).…”