粗面岩
成分相当于正长岩的火山岩。呈浅灰、浅黄或粉红等色。常具斑状结构。按所含长石性质的不同，分为钾质粗面岩和钠质粗面岩。前者以碱性长石（透长石、正长石）占优势，并含少量斜长石，有时含角闪石、黑云母等暗色矿物；后者以钠长石和歪长石占优势，或含量较多，同时铁镁矿物也常富含钠质。基质常为隐晶质或微晶，具粗面结构。有时具流纹构造或气孔构造，通常与流纹岩或安山岩等伴生。粗面岩一词源自希腊语trachys，意为粗糙。
24
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Contributor
contributed at 2011-10-09
Classification(s)
●
Earth System(in Chinese) Igneous petrology
Detailed Description
| English |
|---|
| Name | trachyte |
| Chinese |
|---|
| Name | 粗面岩 |
| Description | 成分相当于正长岩的火山岩。呈浅灰、浅黄或粉红等色。常具斑状结构。按所含长石性质的不同，分为钾质粗面岩和钠质粗面岩。前者以碱性长石（透长石、正长石）占优势，并含少量斜长石，有时含角闪石、黑云母等暗色矿物；后者以钠长石和歪长石占优势，或含量较多，同时铁镁矿物也常富含钠质。基质常为隐晶质或微晶，具粗面结构。有时具流纹构造或气孔构造，通常与流纹岩或安山岩等伴生。粗面岩一词源自希腊语trachys，意为粗糙。 |
How to Cite
NNU_Group (2011). 粗面岩, Concept & Semantic, OpenGMS,
https://geomodeling.njnu.edu.cn/repository/concept/1ba8e516-7fc5-4395-97f3-0fa9f70dc596
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