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According to the main rock-forming minerals in them, the Cenozoic volcanic rocks are mainly alkali olivine basalt, basanite and nephelinite. 郯廬斷裂帶中段的新生代火山巖以堿性系列的堿性橄欖玄武巖、碧玄巖和霞石巖爲主，其中又以鈉質亞系的巖石爲主。