The bottom line is that in 2008, we said the primitive water content in the lunar magmas should be similar to lavas coming from the Earth's depleted upper mantle
," said Alberto Saal of Brown University in Providence,.
Lavas incorporate variable contributions from both trace-element-depleted upper mantle and trace element-enriched veins, blobs or streaks embedded in the depleted upper mantle.
2005a, b), whereas incompatible-element-depleted tholeiitic lavas are ascribed to melting of the depleted upper mantle (e.
The strict two-layer model includes a primitive lower mantle and a depleted upper mantle
that is very occasionally pierced by rising plumes of primitive material, which eventually form hotspots like the Hawaiian Islands.
The percentage of depleted mantle (30%; more recent estimates higher) resembled the amount of mantle above the 670 km seismic discontinuity suggesting a depleted upper mantle
, a primitive lower mantle, and little or no exchange between the two (Hofmann, 2003; Bennett; 2003).