你应当注意的是，处于玄武岩区内的流纹岩岩颈上较高的钾浓度值，随著平滑程度的增大而逐渐变得不明显了。
You should note how the enhanced potassium values over the rhyolite plug within the area of basalts become progressively less obvious with increasing broader smoothing.
昌乐蓝宝石闻名遐尔，但蕴藏蓝宝石的火山岩及火山群却少有人知。 昌乐县境内几十个由新近纪临朐群牛山组尧山组玄武岩构成的山包，大都是古火山口（颈）。
Many mountains in Changle county which were composed of basalts in Niushan and Yaoshan formation of Linqu group in New Neogene period are mainly Neo-volcanic craters.
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