| Abstract: | Arc volcanism in Alaska is strongly correlated with the 100 km depth contour of the western Aluetian Wadati-Benioff zone. Above the eastern portion of the Wadati-Benioff zone however, there is a distinct lack of volcanism (the Denali volcanic gap). We observe high Poisson‘s ratio values (0.29-0.33) over the entire length of the Alaskan subduction zone mantle wedge based on regional variations of Pn and Sn velocities. High Poisson‘s ratios at this depth (40-70 km), adjacent to the subducting slab, are attributed to melting of mantle-wedge peridotites, caused by fluids liberated from the subducting oceanic crust and sediments. Observations of high values of Poisson‘s ratio, beneath the Denali volcanic gap suggest that the mantle wedge contains melted material that is unable to reach the surface. We suggest that its inability to migrate through the overlying crust is due to increased compression in the crust at the northern apex of the curved Denali fault. |
| Genre: | Article |
| ProdID: | 70024390 |
| Citation Author: | McNamara, D. E.; Pasyanos, M. E. |
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| Citation End Page: | 1 |
| Citation Issue: | 16 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Number Of Pages: | -59 |
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| Citation Search Results Text: | Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska; 2002; Article; Journal; Geophysical Research Letters; McNamara, D. E.; Pasyanos, M. E. |
| Citation Start Page: | 61 |
| Citation Volume: | 29 |
| Citation Year: | 2002 |
| Type: | citation/reference |
| Text: | Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska; 2002; Article; Journal; Geophysical Research Letters; McNamara, D. E.; Pasyanos, M. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 2002 00:00 -0600 |
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