Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska

Details Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29p..61m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 16, pp. 61-1, CiteID 1814, DOI 10.1029/2001GL014088

Physics

5

Seismology: Body Wave Propagation, Seismology: Lithosphere And Upper Mantle, Seismology: Volcano Seismology (8419), Tectonophysics: Tomography, Seismology: Continental Crust (1242)

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-925230