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

Publication Status is "Submitted" Or "In Press: 
Yes
LDEO Publication: 
Yes
Publication Type: 
Year of Publication: 
2003
Editor: 
Journal Title: 
Geophysical Research Letters
Journal Date: 
Jul 16
Place Published: 
Tertiary Title: 
Volume: 
30
Issue: 
14
Pages: 
-
Section / Start page: 
Publisher: 
ISBN Number: 
0094-8276
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000184599000001
LDEO Publication Number: 
6506
Call Number: 
Abstract: 

[1] 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 shows 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 m(3)/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.

Notes: 

708YYTimes Cited:1Cited References Count:22

DOI: 
Doi 10.1029/2003gl017104