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- W122489687 abstract "Between 5° and 11°S, the Mid-Atlantic Ridge displaysanomalous crustal thickness and geochemical compositions,thought to be related to either small scale upper mantleheterogeneities or a weak, diffuse mantle plume. We reportnew high precision trace element and Sr, Nd and Pb (DS)isotope data for 72 ridge axis samples and 9 off-axis seamountsamples along with U–Th–Ra disequilibria data for off axisseamounts at c. 9.7°S. At least four distinct components areneeded to explain the geochemical variations along the ridge:1) a common depleted (D-MORB-like) component near andnorth of 4.8–7.6°S, 2) an enriched component upwellingbeneath Ascension Island and the northern A1 ridge segment(segment numbers ascend from north to south), 3) an enrichedcomponent upwelling beneath the A2 ridge segment, and 4) anenriched component upwelling beneath the line of seamountseast of the A3 segment and the A3 and A4 segments. The A1and the A3+A4 segment lavas form well-defined mixingarrays from Ascension Island and the A3 seamountsrespectively to the depleted D-MORB component. Wepropose that the enriched components represent differentpackages of subducted ocean crust and/or ocean island basalt(OIB) type volcanic islands and seamounts that have eitherbeen recycled through 1) the shallow mantle, upwellingpassively beneath the ridge system or 2) the deep mantle viaan actively upwelling heterogeneous mantle plume thatinteracts with the ridge system." @default.
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- W122489687 date "2011-01-01" @default.
- W122489687 modified "2023-09-26" @default.
- W122489687 title "Chemical Heterogeneities along the South Atlantic Mid-Ocean-Ridge (5-11°S): Shallow or Deep Recycling of Ocean Crust?" @default.
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