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Book Chapter

The Eastern Aleutian Continental Margin

By
Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Michael Fisher
Michael Fisher
U.S. Geological Survey Menlo Park, California
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John Miller
John Miller
U.S. Geological Survey Denver, Colorado
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Published:
January 01, 1986

Abstract

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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Contents

AAPG Studies in Geology

Seismic Images of Modern Convergent Margin Tectonic Structure

Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Susan Vath
Susan Vath
U.S. Geological Survey Menlo Park, California
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Christine Sperber
Christine Sperber
U.S. Geological Survey Menlo Park, California
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Bridgett Fulop
Bridgett Fulop
U.S. Geological Survey Menlo Park, California
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Lee Bailey
Lee Bailey
U.S. Geological Survey Menlo Park, California
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Monique Martin
Monique Martin
U.S. Geological Survey Menlo Park, California
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American Association of Petroleum Geologists
Volume
26
ISBN electronic:
9781629811499
Publication date:
January 01, 1986

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