Other
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000e%26psl.175...55m&link_type=abstract
Earth and Planetary Science Letters, Volume 175, Issue 1-2, p. 55-67.
Other
37
Scientific paper
We report the results of a seismic tomography experiment which images the three-dimensional nature of the crustal melt delivery system beneath a segment of the slow-spreading Mid-Atlantic Ridge. In the lower crust (>3.5 km depth) near the segment center, inversion of first-arriving crustal P-waves reveals a pair of vertical pipe-like (<10-km-diameter) low-velocity anomalies (-0.4 km/s). In the upper crust, these two features, which are physically isolated from each other below 3 km, both connect to a 10-km-wide, 45-km-long, axis-parallel, low-velocity zone (-0.2 km/s). Three higher-amplitude low-velocity anomalies (-0.6 km/s) are observed in the upper crust (<2 km depth), and are located directly beneath seafloor volcanic features. We interpret the overall image to represent the thermal/melt signature of a magma feeding system in which focused injections of magma from the mantle travel upward until they intersect the brittle-ductile transition, where they are then diverted along-axis to supply shallow intrusive bodies and seafloor eruptions along much of the ridge segment.
Barclay Andrew H.
Collins John A.
Detrick Robert S.
Magde Laura S.
Toomey Douglas R.
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