| Abstract: | Subduction accretion and repeated terrane collision shaped the Alaskan convergent margin. The Yakutat Terrane is currently colliding with the continental margin below the central Gulf of Alaska. During the Neogene the terrane‘s western part was subducted after which a sediment wedge accreted along the northeast Aleutian Trench. This wedge incorporates sediment eroded from the continental margin and marine sediments carried into the subduction zone on the Pacific plate. Prestack depth migration was performed on six seismic reflection lines to resolve the structure within this accretionary wedge and its backstop. The lateral extent of the structures is constrained by high-resolution swath bathymetry and seismic lines collected along strike. Accretionary structure consists of variably sized thrust slices that were deformed against a backstop during frontal accretion and underplating. Toward the northeast the lower slope steepens, the wedge narrows, and the accreted volume decreases notwith-standing a doubling of sediments thickness in the trench. In the northeasternmost transect, near the area where the terrane‘s trailing edge subducts, no frontal accretion is observed and the slope is eroded. The structures imaged along the seismic lines discussed here most likely result from progressive evolution from erosion to accretion, as the trailing edge of the Yakutat Terrane is subducting. |
| Genre: | Article |
| ProdID: | 70021798 |
| Citation Author: | Fruehn, J.; Von Huene, R.; Fisher, M. A. |
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| Citation End Page: | 277 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Tectonics |
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| Citation Number Of Pages: | 15 |
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| Citation Search Results Text: | Accretion in the wake of terrane collision: The Neogene accretionary wedge off Kenai Peninsula, Alaska; 1999; Article; Journal; Tectonics; Fruehn, J.; Von Huene, R.; Fisher, M. A. |
| Citation Start Page: | 263 |
| Citation Volume: | 18 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Accretion in the wake of terrane collision: The Neogene accretionary wedge off Kenai Peninsula, Alaska; 1999; Article; Journal; Tectonics; Fruehn, J.; Von Huene, R.; Fisher, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1029/1998TC900021 |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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