SUBMARINE BASALTS . SOME K,RB,SR,BA, RARE-EARTH, H20, AND CO2 DATA BEARING ON THEIR ALTERATION, MODIFICATION BY PLAGIOCLASE, AND POSSIBLE SOURCE MATERIALS

Typical sea-water alteration of submarine basalts apparently effects little change in their Sr and rare-earth concentrations, in general, and enrichments or depletions of Ba of up to about 50%. The trace element data indicate that plagioclase has had an important effect in modifying composition. A simple model indicates eclogite or garnet peridotite as the most likely source rocks of alkali and submarine basalts. © 1969.