The Eastern Aleutian Continental Margin
Published:January 01, 1986
Roland von Huene, Michael Fisher, John Miller, 1986. "The Eastern Aleutian Continental Margin", Seismic Images of Modern Convergent Margin Tectonic Structure, Roland von Huene, Susan Vath, Christine Sperber, Bridgett Fulop, Lee Bailey, Monique Martin
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The seismic section across the Eastern Aleutian margin off southern Kodiak Island illustrates structure from the axis of the eastern Aleutian Trench to the edge of the Kodiak shelf. The seafloor morphology includes a flat trench axial area, a lower slope with two main steps, and a sharp topographic break marking the base of the steepened upper slope. The seismic section crosses a deep canyon in the upper slope, connected to one of the relict glacial troughs that cross the Kodiak Shelf (Hampton, 1983).
The Kodiak margin is composed of the insular outcrops containing metamorphosed accretion complex of Upper Cretaceous to Eocene age, the Kodiak shelf with the Neogene Albatross basin behind a high at the edge of the shelf named Albatross bank, and the landward slope of the trench. Albatross basin is filled with upper Miocene to Recent sediment 5 km deep (Fisher and von Huene, 1980) and is floored by a subareal erosion surface across landward-tilted Eocene and Oligocene (?) strata. These strata were sampled northeast of the seismic record section at Middleton Island (Rau et al., 1977; Keller et al., 1984), on the seaward flank of Albatross basin (Herrera, 1978), and southwest of it near Sanak Island (Bruns et al., in press). Subsidence of the Miocene regional erosion surface began about 6 Ma and subsequently, about 2 Ma, Albatross bank was uplifted at least 3 km (Fisher and von Huene, 1980; von Huene et al., in press). Thus, the steep upper slope that descends from Albatross bank
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Seismic Images of Modern Convergent Margin Tectonic Structure
In 1980, A. W. Bally assembled and edited an innovative three-volume “picture and work” atlas of seismic reflection record sections. This compilation of more than 130 excellent seismic section reproductions provided much new data from the earth's subsurface. For petroleum geologists, academic scientists, and students, it is the field geologist's counterpart of outcrops and type sections. The smaller collection of seismic sections presented in this Studies 26 publication was inspired by Bally's atlas, and follows his general format and philosophy. The objective is to provide a reference series of sections for the earth sciences and a vehicle for continuing scientific dialogue relating to modern convergent margins. This publication's assembled sections represent a single facet of that dialogue by bringing together a series of exceptional seismic sections from the fronts of presently active convergent margins around the Pacific.