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Basalt was recovered from four sites (136, 137, 138 and 141) drilled on Leg 14 of the Deep Sea Drilling Project. Recovered samples were originally glassy to holocrystalline basalt, now altered to varying degrees. Four of the fresher samples have been chemically analyzed. The analyses are given in Tables 1 and 2, and modes in Table 3. Table 4 summarizes the X-ray study of alteration products. A general petrographic description of each analyzed sample, based on hand specimen, optical and X-ray examination, is given below. The results show a greater diversity of basalt types than might have been expected, ranging from low-K2O tholeiite (Site 136) through alkalic basalt (Site 138) to highly altered Plagioclase porphyritic basalt of uncertain affinity (Site 137). Basalt from Site 141 is so altered that we could not determine its magmatic parentage.

Petrology of Basaltic Rocks Collected from Leg 14