Melt extraction pathways at segmented oceanic ridges: Application to the East Pacific Rise at the Siqueiros transform

Details Melt extraction pathways at segmented oceanic ridges: Application to the East Pacific Rise at the Siqueiros transform Melt extraction pathways at segmented oceanic ridges: Application to the East Pacific Rise at the Siqueiros transform

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3811306h&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 11, CiteID L11306

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Computational Geophysics: Modeling (1952, 4255, 4316), Marine Geology And Geophysics: Midocean Ridge Processes

Scientific paper

Throughout the global mid-ocean ridge system, transform faults offset spreading centers. Conductive cooling may be more efficient beneath transform faults, producing a thickened lithosphere that directs melt away from the transform. However, recent observations of thickened crust along transform faults at fast ridges suggest melt redistribution toward transforms, intra-crustal melt production, or efficient extraction of melt. We apply a 3-D model of melt migration and extraction along an oceanic transform domain bounded by ridge segments. Melt is assumed to travel vertically before collecting and migrating beneath a low-permeability boundary inclined towards the ridge axis. A melt extraction zone, which may be geologically interpreted as the presence of faults and/or dikes leading to rapid lateral and vertical melt migration toward plate boundaries, affects the pattern of crustal accretion at segmented ridges. First, we examine a generic ridge-transform-ridge geometry and then a model that represents the Siqueiros transform on the East Pacific Rise. On the basis of crustal thickness variations within the intra-transform spreading centers along the fast-slipping Siqueiros fault, we constrain the presence of a melt extraction zone within 10 km of the transform zone.

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