英安岩




Mineraly.sk - dacit.jpg

英安岩是一种化学成分和闪长岩相当的火山喷出岩石，颜色为灰色、灰白或灰红等浅色，斑状或块状结构，基质为隐晶质和玻璃质，以石英和长石为主，有时具有流纹构造。斑晶以斜长石为主，也有石英、正长石、透长石的斑晶存在。


英安岩常与粗面岩、安山岩和流纹岩等共生，在中国，主要产于东南沿海各地。


英安岩的中文名称来源于含更多石英的安山岩之意。其英文名称dacite源于在达契亚（Dacia）的喀尔巴阡山脉发现并命名这种岩石；-ite后缀是希腊文岩石之意。



参考文献


Public Domain 本條目出自公有领域：Chisholm, Hugh (编). 大英百科全書 第十一版. 劍橋大學出版社. 1911年. 



外部链接


  • 英安岩图片







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常見火成岩的分類



















种类 超基性岩
< 45% SiO2		 基性岩
< 45-52% SiO2		 中性岩（英语：Intermediate composition）
52–63% SiO2		 中性岩（英语：Intermediate composition）-长英质
63–69% SiO2		 长英质
>69 % SiO2

火山岩(喷出岩):
浅成岩:
深成岩:

科马提岩,苦榄岩
金伯利岩, 钾镁煌斑岩
橄榄岩

玄武岩
辉绿岩（英语：Diabase）(粗玄岩（英语：dolerite）)
辉长岩

安山岩
闪长玢岩,正长斑岩
闪长岩

英安岩

花岗闪长岩

流纹岩
细晶岩—伟晶岩
花岗岩























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火山

火山种类


  • 破火山口

  • 火山渣錐

  • 混合火山

  • 裂缝喷发口

  • 熔岩锥（英语：Lava cone）

  • 火山穹丘

  • 低平火山口

  • 泥火山

  • 寄生火山錐

  • 火山碎屑锥（英语：Pyroclastic cone）

  • 火山碎屑盾狀火山

  • Rootless cone

  • 盾状火山

  • 外轮山火山（英语：Somma volcano）

  • 複式火山

  • 冰下火山（英语：Subglacial volcano）

  • 海底火山

  • 超级火山

  • 火山錐

  • 火山场（英语：Volcanic field）
Puu Oo cropped.jpg
火山岩


  • 喷出岩

  • 集塊岩

  • 安山岩

  • 玄武岩

  • 玄武安山岩（英语：Basaltic andesite）

  • 歪长粗面岩（英语：Benmoreite）

  • 方沸斑岩（英语：Blairmorite）

  • 英安岩

  • 霏细岩（英语：Felsite）

  • 科马提岩

  • 安粗岩（英语：Latite）

  • 霞石岩（英语：Nephelinite）

  • 黑曜岩

  • 响岩

  • 流纹英安岩

  • 流紋岩

  • 粗面岩

  • 粗面安山岩（英语：Trachyandesite）

  • 粗面玄武岩（英语：Trachybasalt）

  • 凝灰岩
火山群列表


  • 火山列表

  • 热点

  • 十年火山

  • 火山弧

  • 火山带



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