potassic volcanic rock

• 钾质火山岩

potassic volcanic rock的用法和样例：

例句

1. The massive sulfides related to felsic volcanic rocks in the back-arc and island arc environments have higher content of gold.
   通常形成于弧后或岛弧环境下的同长英质火山岩有关的块状硫化物中的金含量较高。