双峰火山作用;
These rocks are rich in alkali and potassium, and relatively depleted in MgO, TiO2, with enriched Sr-Nd-Pb compositions, belong to cal-alkaline to alkaline series, which having a characteristics of bimodal volcanism.
火山岩具有双峰式火山岩和玄粗岩岩系的特征,岩石富碱、富钾,相对贫MgO、TiO2,具有富集的Sr-Nd-Pb同位素组成。
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