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Electron probe microanalyses of relic clinopyroxenes of Paleozoic greenstones from the Tamba district, southwest Japan, suggest that the original rocks were derivatives of various types of magma, ranging from tholeiite through normal alkali to peralkali basalts. On the other hand, bulk chemical analyses of rocks indicate that they would have been mostly of the alkali basalt series. The discrepancy between the pyroxene chemistry and the bulk composition of rocks may have resulted from the chemical changes which the greenstones have suffered during the metamorphism. Similar study on the relic clinopyroxenes of the Mikabu Green Rocks showed that the rocks were derived from the tholeiitic magmas. The bulk analyses of the Mikabu rocks also give the same conclusion.

RELIC CLINOPYROXENES OF PALEOZOIC GREENSTONES OF THE TAMBA AND MIKABU TERRANES, SOUTHWEST JAPAN