Early Miocene or younger normal faults and other Tertiary structures in west Nass River map area, northwest British Columbia, and adjacent parts of Alaska
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Abstract
Steeply dipping brittle faults which strike 350° cut early Tertiary and older rocks in the Coast Belt along, east of, and west of Portland Canal. The Big Dam Fault is a west-side-down brittle fault zone 2 km wide which cuts ca. 61-53 Ma granite. The Portland Canal Fault is interpreted to have east-side-down displacement postdating 22 Ma, and possibly 5 Ma. Parallel faults in early Tertiary granite between northerly projections of the two faults are steeply east and west dipping, and extensional in nature. The Big Dam and Portland Canal faults are assumed to be related to the other faults of similar character postdating the early Tertiary, and therefore extensional. The presence of these faults has implications for interpretation of ACCRETE seismic data, which were acquired in Portland Canal, along a transect which is coplanar with the Portland Canal Fault for a distance of 20-50 km.
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