ocean-island basalts  search
BTigneous rocks
 .volcanic rocks
 ..basalts
 ...ocean-island basalts
UFOIB
RTalkali basalts
 nephelinite
 tholeiite
SNTholeiites, alkali basalts and nephelinites found on submarine volcanoes which form ocean islands away from ocean ridges. Chemically distinct from mid-ocean ridge basalts.