groundmass
/ground-mas/US // ˈgraʊndˌmæs //UK // (ˈɡraʊndˌmæs) //
地面物质,地盘,地表水,地表水层
Definitions
n.名词 noun
- 1
- : the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.
Examples
The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent.
In a basal flow in Moraine Park, the slaggy and compact phases show differences in phenocrysts as well as in groundmass.
These lavas have groundmass textures that vary from almost holo-crystalline to glassy.
Pyroxene, quartz and augite form the groundmass, as seen in section.
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