北京燕山构造旋回安粗岩系

安粗岩系是指由钾质粗面玄武岩，橄榄玄武粗安冉、安粗岩，粗面岩和高钾流纹岩等富钾岩石组成的火山岩系列。本文以北京地区燕山构造旋回安粗岩系火山岩为例，通过与国内外公认的安粗岩系比较，以及对不同系列火山岩特征的对比分析，明确提出：安粗岩系是可以与拉斑玄武岩系、钙碱性岩系和碱性玄武岩系并列存在的独立的火山岩系列，它有自己特写的产出环境，有别于其他岩系的岩石类型，岩石组合及物质成分等特点。

Latitic Series of the Yanshanian Tectonic Cycle in Beijing Region

Latitic series is a potash-rich volcanic rock series consisting of potassic trachyasalt,shoshonite,latite,trachyte and high-K rhyolite.This paper compares latitic series of the Yan-shanian tectonic cycle in Beijing region with those of the generally accepted latitic series bothat home and abroad, then discusses the characteristics of the different volcanic rock series,and lastly points out that the latitic series is an independent volcanic rock series which maycoordinate with the tholeiite series,calcalkaline series and alkali-basalt series.