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Abstract

DANG Transect A-2. Part of GSA’s DNAG Continent-Ocean Transect Series, this transect contains all or most of the following: free-air gravity and magnetic anomaly profiles, heat flow measurements, geologic cross section with no vertical exaggeration, multi-channel seismic reflection profiles, tectonic kindred cross section with vertical exaggeration, geologic map, stratigraphic diagram, and an index map. All transects are on a scale of 1:500,000.

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    Abstract
    A-2 transect group, Roland von Huene, leader: Stephen Box, Kuskokwim Mountains; Bob Detterman, Alaska Peninsula; Michael Fisher, Shelikof Strait, Kodiak shelf, Aleutian slope; Casey Moore, Kodiak Islands; Hans Pulpan, seismicity; Roland von Huene, Aleutian slope, Kodiak shelf.

    The A-2 Kodiak to Kuskokwim Transect crosses the seismically active eastern Aleutian Trench in the Gulf of Alaska, traverses the marine and insular forearc region that includes southern Kodiak Island and Shelikof Strai t, traverses the Alaska Peninsula which includes the modern Aleutian Are, drops into the Bristol Bay and lowland area of the Bering Sea, and comes ashore in the southwestern Kuskokwim Mountains. Thus the A-2 transect crosses an ocean to continent transition from the oceanic crust of the north Pacific Basin to the interior cordillera of Alaska. This transition is made across a series of fossil arc-trench systems. We located the transect to take advantage of a concentration of marine geophysical data, a local network of seismometers to record earthquakes accurately, recent geologic studies on the Alaska Peninsula and Kuskokwim Mountains, and a tectonic style that generally represents the eastern Aleutian arc-trench system.

    We are identified on the graphic display with our individual contributions. In the graphic display we have shown the basic data allowed by both the small scale and the transect's group format which emphasizes intra-transect comparison. Most of the data we synthesize here appears in greater detail elsewhere and the other publications are referenced. A similar but shorter multi-authored cross section located north of this transect was published as part of the previous U.S. Geodynamics Committee transect series (von Huene et a L, 1979a); this transect differs from the previous one in being longer and in encompassing more recent studies. Two marine geophysical surveys were

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