Chemical Characteristics of Oceanic Basalts and the Upper Mantle Engel, A. E. J. ; Engel, Celeste G. ; Havens, R. G. Abstract Publication: Geological Society of America Bulletin Pub Date: 1965 DOI: 10.1130/0016-7606(1965)76[719:CCOOBA]2.0.CO;2 Bibcode: 1965GSAB...76..719E