1, slightly higher for a protolith of oceanic basalt
The hydrogen got there thanks to slabs of water-rich oceanic basalt
forced down into the mantle along subduction zones.
The mantle plumes have produced up to 26 cubic kilometers of oceanic basalt
each year during the last 150 million years.
Mass-balance and noble-gas arguments indicate that most of the mantle is depleted but He and Ne isotopes, and convergence of Sr-Nd-Pb isotopic arrays suggest that FOZO is a somewhat primitive (unmelted) component common to all oceanic basalt sources.
The distribution of mantle and atmospheric argon in oceanic basalt glasses: Geochimica et Cosmochimica Acta, v.
It implies that U was added or Pb removed from the mantle sources of all oceanic basalts in the ancient past.
Kamber and Collerson (2000) proposed that correlated Zr and Nb concentrations in oceanic basalts indicate mixing between MORB mantle and sources (components) variably affected by metasomatic partial melts.
Geochemical fingerprinting of oceanic basalts
with applications to ophiolite classification and the search for Archean oceanic crust.
Trace element mobility during hydrothermal alteration of oceanic basalts
1965, Chemical characteristics of oceanic basalts
and the upper mantle: Geological Society of America Bulletin, v.
The researchers used a series of thermodynamic calculations to determine that the source material for BIFs must have come from oceanic rocks with a very low aluminum content, unlike modern oceanic basalts
that contain high levels of aluminum.
Evidence for microbial activity at the glass-alteration interface in oceanic basalts