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笔者测定了六个代表碱玄岩系列岩石的~(87)Sr/~(86)Sr比值.这些岩石包括1981-1982年从断裂区西部的Nyamuragira火山喷出的熔岩.比值的范围和平均值分别为0.70543-0.70587和0.70572,与Bell和Powell(1969)、Pewell和Bell(1974)报导的断裂区西部的暗橄白榴岩的比值(0.7054-0.7059和0.7056)较一致.岩石学和地球化学资料表明了橄榄碧玄岩-碱玄岩-响岩质碱玄-岩碱玄岩质响岩这些碱玄岩系列是一个暗橄白榴岩母岩浆连续分离的产物(Aoki等,1984).其同位素测定结果有力地支持了这一结论.
The authors measured the 87 Sr / 86 Sr ratios for six representative basaltic series of rocks, including lava ejected from the Nyamuragira volcano in the western part of the fault zone from 1981 to 1982. The range and mean value of the ratios (0.70543-0.70587 and 0.70572, respectively), which are in good agreement with the ratios of dark-olurite (0.7054-0.7059 and 0.7056) reported by Bell and Powell (1969), Pewell and Bell (1974) to the western part of the fault zone.Petronics and geochemistry data indicate The olivine basalt - basaltic rock - sonic basaltic - lithic basaltic rock acoustic rock These basalt series is a continuous separation of dark olivine pluton from the parent magma (Aoki et al., 1984). The isotopic results Strongly supports this conclusion.