Occurrence and Exploration Significance of Strike-Slip Faults in Southern New Brunswick, Canada
1963; American Association of Petroleum Geologists; Volume: 47; Linguagem: Inglês
10.1306/bc743b7d-16be-11d7-8645000102c1865d
ISSN1558-9153
Autores Tópico(s)Geological formations and processes
ResumoThe epieugeosynclinal basins of Carboniferous, Permian, and Triassic age in the Canadian Maritime Provinces are cut prominently and bordered locally by northeasterly to easterly trending faults which were active recurrently during sedimentation. In southern New Brunswick, at least, these are predominantly strike-slip faults of both right-lateral and left-lateral sense. Structural forms and histories are analogous with post-Mesozoic tectonics of the strike-slip fault complex in California. The Harvey-Hopewell fault, which separates the Cumberland basin of northern Nova Scotia from the Caledonia arch of New Brunswick, slipped left-laterally in early Pennsylvanian in response to north-south principal stress, offsetting a latest Mississippian marginal alluvial fan at least 10 miles and developing large decollement folds in the basin. The Lubec fault of Eastport, Maine, and its extensions and branches in New Brunswick, slipped right-laterally at the end of or within Mississippian, probably some tens of miles, in response to east-west principal stress. Thrust faulting north of the Caledonia arch can be attributed to northwest-southeast compression as the stress field was rotated in a counter clockwise direction, from the east-west orientation in Mississippian to the north-so th orientation in early Pennsylvanian. Petroleum exploration should be planned with due consideration for offsets of structures and lithofacies, right-laterally in most of New Brunswick and, probably, in northern Prince Edward Island, and left-laterally or possibly both ways in the region on the southeast.
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