Ultra-depleted primary melt included in an olivine from the Mid-Atlantic Ridge

Details Ultra-depleted primary melt included in an olivine from the Mid-Atlantic Ridge Ultra-depleted primary melt included in an olivine from the Mid-Atlantic Ridge

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.363..151s&link_type=abstract

Nature (ISSN 0028-0836), vol. 363, no. 6425, p. 151-154.

Other

84

Basalt, Geochemistry, Magma, Mid-Ocean Ridges, Olivine, Atlantic Ocean, Melting

Scientific paper

The existence of very depleted melts in mid-ocean ridges was predicted previously in order to explain the presence of magnesian pyroxene and calcic plagioclase in mid-ocean ridge basalts. The discovery of melt is reported here that has major and trace element characteristics consistent with these predictions, occurring as an inclusion in an olivine phenocryst in a typical midocean ridge basalt from the Mid-Atlantic Ridge. Although our preferred model for the origin of this 'ultradepleted' melt is critical (continuous) melting, we cannot at this stage rule out other models. Our results underscore the importance of trapped melt inclusions as recorders of the processes involved in melting and melt extraction and also as pointers to primary melt compositions.

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