玻镁安山岩（Boninite），以其岩石化学及地球化学特征、独特环境和成困区别于岛弧拉班玄武岩和钙碱系列玄武岩，为洋内弧特征产物．据化学成分分为高钙和低钙两个系列，后者细分Ⅰ、Ⅱ、Ⅲ型．它们在岩石化学、地球化学、岩相学矿物化学、构造背景上易于区别．从高钙至Ⅲ、Ⅱ、Ⅰ型玻镁安山岩浆是由流体不断加入的俯冲带上部橄榄岩和亏损的斜辉橄榄岩在持续高温下分熔演化产生．玻镁安山岩产于洋内弧与俯冲消减有关的各结构单元中． Boninite, distinguished by its petrochemical and geochemical characteristics, unique environment and formation, is distinguished from the island arc basalts of LaBan and basalts of calc-alkali series, and is characterized by intra-arc features. According to chemical composition is divided into two series of high calcium and low calcium, the latter subdivision Ⅰ, Ⅱ, Ⅲ type. They are easily distinguishable in petrochemistry, geochemistry, petrographic mineral chemistry, tectonic setting. From high calcium up to Ⅲ, Ⅱ and Ⅰ, the volcanic Andesite magmatism is derived from subduction zone upper peridotite and depleted lherzolite which are continuously added by fluid, and are produced by sub-melting at sustained high temperature. Bauxite andesite produced in the ocean arc and subduction of the various structural units.