Deformation of the southeast part of the Columbia Plateau
Journal Article
·
· Geology; (United States)
- Washington State Univ., Pullman
Four structural elements north of the Olympic-Wallowa lineament in the southeast part of the Columbia Plateau (Washington, Idaho, and Oregon) are (1) the offlap of progressively younger basalt units from prebasalt topographic highs; (2) east-west open folds associated with reverse faulting; (3) northwest-southeast, northeast-southwest, and north-south faults with predominantly vertical displacement; and (4) vertical north-northwest-south-southeast feeder dikes. These may be explained by (1) a regional east to west tilting of the plateau caused by the isostatic rise of older rocks on the eastern margin; (2) a stress regime with a horizontal maximum principal stress in a north-northwest-south-southeast direction, and a horizontal minimum principal stress in a west-southwest-east-northeast direction; and (3) reactivation of an older northwest-southeast, northeast-southwest, and north-south structural grain in the pre-Miocene basement. The stress regime is similar to that envisaged for the area southwest of the Olympic-Wallowa lineament, and the difference in the type of deformation on either side of that feature may be attributed to differences in the thickness of the crust across the ancient boundary.
- OSTI ID:
- 6407289
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 9:7; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evidence of northwest-southeast directed compression of Late Cenozoic age in the Summit Diggings, San Bernardino County, California
Orientation of least-principal horizontal stress: Arizona, New Mexico, and the Trans-Pecos area of west Texas: stress data and references
Extension, displacement, and block rotation in the larger Gullfaks area, Northern North Sea: Determined from map view restoration
Conference
·
Thu Jan 31 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5141570
Orientation of least-principal horizontal stress: Arizona, New Mexico, and the Trans-Pecos area of west Texas: stress data and references
Technical Report
·
Sun Jan 31 23:00:00 EST 1982
·
OSTI ID:5204559
Extension, displacement, and block rotation in the larger Gullfaks area, Northern North Sea: Determined from map view restoration
Journal Article
·
Sat Jun 01 00:00:00 EDT 1996
· AAPG Bulletin
·
OSTI ID:272597
Related Subjects
052002 -- Nuclear Fuels-- Waste Disposal & Storage
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
BASALT
COLUMBIA RIVER BASIN
GEOLOGY
IDAHO
IGNEOUS ROCKS
NORTH AMERICA
OREGON
PACIFIC NORTHWEST REGION
ROCKS
USA
VOLCANIC ROCKS
WASHINGTON
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
BASALT
COLUMBIA RIVER BASIN
GEOLOGY
IDAHO
IGNEOUS ROCKS
NORTH AMERICA
OREGON
PACIFIC NORTHWEST REGION
ROCKS
USA
VOLCANIC ROCKS
WASHINGTON