Structure and petroleum potential of the continental margin between Cross Sound and Icy Bay, northern Gulf of Alaska

Hydrocarbon resource report for proposed OCS lease sale 88; southeastern Alaska, northern Gulf of Alaska, Cook Inlet, and Shelikof Strait, Alaska

“…Numbers correspond to numbered dredge locations in figure 4 and Tables 3-6. From Plafker and others, 1980. refraction and reflection data, show that Paleogene rocks underlie much of the Yakataga and Middleton segments, and are present at shallow depths beneath the Middleton segment (Bayer and others, 1978;Bruns 1979Bruns , 1982Bruns and Schwab, in press;others, 1980, 1982). Rocks of Eocene and Oligocene age were penetrated in the lower part of the Tennaco Middleton Island Well, drilled on state lands near Middleton Island (Rau and others, 1977).…”

“…The following summary of geologic history is taken from work in progress by T. R. Bruns and George Plafker and from Stonely (1967);Plafker (1971); others (1975, 1978 a,b,) ;Rogers, (1977); others (1977,1981); Bruns (1979Bruns ( , 1982; von Huene and others (1979); Perez and Jacob (1980); ; and Bruns and Schwab (in press) The southern margin of Alaska began to assume its present form in about mid-Cretaceous time by assembly of several northward-moving microplates, including the Alexander Terrane and Wrangellia, against Precambrian to middle Paleozoic rocks of nuclear Alaska. During the Campanian and Maestrichtian, a volcanic arc developed along the continental margin as a result of relative under-thrusting by Pacific oceanic crust.…”

“…These data are correlated with dredged rocks of Plafker and others (1978cPlafker and others ( , 1979Plafker and others ( , 1980 and with onshore and offshore walls to give approximate ages of structural horizons interpreted on the seismic data. Depth conversion of the seismic data is based on velocity logs from wells and on offshore refraction and reflection velocity data (Bayer and others, 1978;Bruns, 1979Bruns, , 1982Bruns and Schwab, in press). …”

“…Figures 8-20 show seismic lines and the major structural features for each of the areas, either by line drawings of the seismic sections (southeast Alaska), or with seismic sections, structural contour maps and isopach maps. Published interpretations of the seismic reflection and refraction data include Bruns and Plafker (1975), Bayer and others (1978), Bruns (1979Bruns ( , 1980Bruns ( , 1982, and Bruns and Schwab (in press). …”

“…The structural character is illustrated by contour maps and four seismic lines (figs. 10-14;Bruns, 1982).…”