Abstract Olivine-hosted melt inclusions provide crucial information about their parental magma composition and evolution and represent ideal targets for determining the nature of the poorly understood and still-debated magma sources in the Okinawa Trough, a back-arc basin in the western Pacific. We present the first analyses of the lead (Pb) isotope compositions of olivine-hosted melt inclusions to evaluate the mantle properties and petrogenesis of middle Okinawa Trough volcanic rocks. The melt inclusions have more variable major and trace elements and Pb isotope compositions than the host whole-rock samples. We report the discovery of both high-207Pb/206Pb (>0.865) and low-207Pb/206Pb (

中文翻译：

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冲绳海槽中部火山岩的成因：橄榄石熔体包裹体中铅同位素的约束

摘要橄榄石熔体包裹体提供了有关其母岩浆成分和演化的重要信息，并代表了确定冲绳海槽（西太平洋弧后盆地）中知之甚少且仍有争议的岩浆源性质的理想目标。我们首次分析了橄榄石熔体包裹体的铅 (Pb) 同位素组成，以评估冲绳海槽中部火山岩的地幔特性和岩石成因。熔体包裹体比主体全岩样品具有更多可变的主要和微量元素以及 Pb 同位素组成。我们报告了高 207Pb/206Pb（>0.865）和低 207Pb/206Pb（