Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.342..420s&link_type=abstract
Nature (ISSN 0028-0836), vol. 342, Nov. 23, 1989, p. 420-422.
Physics
125
Chondrites, Earth Mantle, Garnets, Geochronology, Hafnium Isotopes, Ocean Bottom, Basalt, Lutetium Isotopes, Neodymium Isotopes, Ridges, Samarium Isotopes, Spinel, Volcanoes
Scientific paper
Midocean-ridge basalts (MORBs) have a Hf-176/Hf-177 ratios indicating derivation from a mantle reservoir with a long-term Lu/Hf ratio greater than that of C12 chondrite meteorites, yet the measured Lu/Hf ratios in MORB are lower than in C1 chondrites: this is the 'hafnium paradox'. It is shown here that the Lu-Hf and Sm-Nd systematics of MORBs require garnet to be a residual phase in MORB melt genesis. This places the onset of melting beneath a midocean ridge at depths greater than 80 km. A sequential melting model, in which melting starts in the garnet stability field and then continues at shallower levels, best explains the combined Nd and Hf isotope systematics and is compatible with present geophysical and geochemical knowledge of midocean-ridge magmatism.
Hart Stanley R.
Salters Vincent J. M.
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