岩相学特征表明，该火山群为典型的钙碱性系列玄武岩安山岩英安岩弧火山岩组合。
The (examination) of the petrography shows that the volcanic terrains in Tengchong are typical of the basalt - (andesite) - (dacite) arc volcanic rock associations of the calc-alkaline series.
金厂沟梁金矿区中与成矿伴生的暗色脉岩主要是细晶闪长岩石英闪长岩、闪长玢岩英安斑岩类。
The dark dikes associated with mineralization in the Jinchanggouliang mine area, are mostly fine diorite-quartz diorites and diorite porphyrite-dacite porphyries.
另外，研究者发现这里的岩浆的成分是英安岩而不是构成夏威夷主体的玄武岩。英安岩是花岗岩的前身。
In addition, researchers found that the magma is made of dacite, a type of rock that's a precursor to granite.
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