【摘要】 选取江苏省东海青龙山含钠云母的石英榴辉岩块状样品,在0.1 GPa、920℃恒温加热4 h的条件下,进行了开放体系的脱水部分熔融实验。样品中含有钠云母、蓝闪石和绿辉石退变形成的后成合晶中的角闪石等含水矿物。该榴辉岩的熔融可以划分为3个阶段:含水矿物的脱水暗化、部分熔融和几乎全部熔融阶段。熔融从含水矿物的脱水暗化开始,玻璃质熔体首先出现在含水矿物边界。在不同的局部熔融体系内,熔体成分从基性到酸性,受到局部熔融体系内部物质组成的控制,与全岩化学成分无关。更多还原

【Abstract】 This study presents the open and dehydration melting experiment on the solid pargonite-bearing quartz-eclogite from Qinglongshan in Donghai,Jiangsu Province.The experiment was conducted at 0.1 GPa,920 ℃ with four hours for running duration.The sample contains hydrous pargonite,glaucophane,and hornblende in symplectite of retrograded omphacite.The process of melting is dehydrating of hydrous minerals,partial melting and almost all melting.The initial melting commences from dehydration melting of the hydrous minerals,and the melt first appears at the grain boundaries of hydrous minerals.The chemical compositions of melts in different localized melting systems range from basic to acid,which depends not on the buck composition of the whole rock,but on different composition of minerals in localized melting systems.更多还原