Global plume-fed asthenosphere flow—II: Application to the geochemical segmentation of mid-ocean ridges
Published:January 01, 2007
Michiko Yamamoto, Jason Phipps Morgan, W. Jason Morgan, 2007. "Global plume-fed asthenosphere flow—II: Application to the geochemical segmentation of mid-ocean ridges", Plates, Plumes and Planetary Processes, Gillian R. Foulger, Donna M. Jurdy
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Asthenosphere plume-to-ridge flow has often been proposed to explain both the existence of geochemical anomalies at the mid-ocean ridge segments nearest an off-axis hotspot and the existence of apparent geochemical provinces within the global mid-ocean spreading system. We have constructed a thin-spherical-shell finite element model to explore the possible structure of global asthenosphere flow and to determine whether plume-fed asthenosphere flow is compatible with present-day geochemical and geophysical observations. The assumptions behind the physical flow model are described in the companion paper to this study. Despite its oversimplifications (especially the steady-state assumption), Atlantic, Indian, and Pacific mid-ocean ridge isotope geochemistry...