Focused magma supply at the intersection of the Cobb hotspot and the Juan de Fuca ridge

Details Focused magma supply at the intersection of the Cobb hotspot and the Juan de Fuca ridge Focused magma supply at the intersection of the Cobb hotspot and the Juan de Fuca ridge

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30n....w&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. -1, CiteID 1724, DOI 10.1029/2003GL017104

Physics

Geophysics

5

Marine Geology And Geophysics: Marine Seismics (0935), Marine Geology And Geophysics: Midocean Ridge Processes, Seismology: Lithosphere And Upper Mantle, Seismology: Oceanic Crust, Seismology: Volcano Seismology (8419)

Scientific paper

We examine the interplay between the Cobb hotspot and the Juan de Fuca ridge by mapping the base of the crust at their intersection near Axial Volcano. PmP traveltimes from an extensive active source seismic experiment are used in conjunction with prior crustal tomography to map crustal thickness. A cross-section along the ridge axis consists of two distinct trends. In addition to 1-2 km of excess crust, inferred from gravity along a 100 km section of the central ridge, we find a narrow 20-40 km diameter root extending to 11 km directly beneath the volcano. Focused magma flux from the Cobb hotspot (0.3-0.8 m3/s) is inferred to be the cause of both the narrow root, and the large magma reservoir, at Axial. The rapid return to thinner crust, away from the intersection, marks a transition back to ridge-dominated magmatism.

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