The composition of the incipient partial melt of garnet peridotite at 3 GPa and the origin of OIB

Details The composition of the incipient partial melt of garnet peridotite at 3 GPa and the origin of OIB The composition of the incipient partial melt of garnet peridotite at 3 GPa and the origin of OIB

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.308..380d&link_type=abstract

Earth and Planetary Science Letters, Volume 308, Issue 3, p. 380-390.

Mathematics

Logic

3

Experimental Petrology, Ocean Island Basalt, Partial Melting, Garnet Peridotite

Scientific paper

We determined experimentally the composition of an incipient partial melt of a garnet lherzolite similar to KLB-1 peridotite at 3 GPa using modified iterative sandwich experiments (MISE). The MISE method enables microbeam analyses of quenched liquids that are in equilibrium at the onset of melting (nominally, 0% melt fraction) with a specified peridotite bulk composition. The equilibrium incipient partial melt is a TiO2-enriched (2.5 ± 0.2 wt.%) alkali olivine basalt with 44.8 ± 0.2 wt.% SiO2 and 15.8 ± 0.1 wt.% MgO. Therefore, it has some compositional characteristics similar to a plausible parent to many alkalic oceanic island basalts. But in detail, several key components of this melt are different from parental liquids of typical primitive alkalic OIB, including lower FeO* (9.7 ± 0.1 wt.%) and higher Al2O3 (12.7 ± 0.2 wt.%). It is also distinct from basalts derived from the EM and HIMU mantle end-members. We conclude that the vast majority of alkalic OIB cannot originate from volatile-poor partial melting of garnet peridotite at the base of the oceanic lithosphere unless there are contributions from non-peridotitic lithologies and/or enrichment in volatiles, iron, or other metasomatic components, and that such lithologic heterogeneities are intrinsic features of the HIMU and EM mantle reservoirs.

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