Granophyre
2459003
208861417
2008-04-28T22:26:42Z
Smalljim
100426
Fixing [[Wikipedia:Disambiguation pages with links|links to disambiguation pages]] using [[Project:AutoWikiBrowser|AWB]]
'''Granophyre''' ({{pronEng|ˈgrænoʊfaɪr}}, from [[granite]] and ''porphyry'') is an [[igneous rock]] that contains [[quartz]] and alkali [[feldspar]] in characteristic angular intergrowths such as those in the accompanying image. [[Image:Granophyre 1.5mm .jpg|thumb|200px|Polarized light microscope image of an intergrowth of quartz and alkali feldspar in a granophyre (Muskox Intrusion), as seen in thin section (Long dimension is 1.5 mm)]] The [[Texture (crystalline)|texture]] is called '''granophyric'''. The texture can be similar to [[micrographic texture]] and to the coarser graphic intergrowths of quartz and alkali feldspar common in [[pegmatite]]. These textures document simultaneous crystallization of quartz and feldspar from a silicate melt at the [[eutectic]] point, perhaps in the presence of a water-rich phase.
Granophyres typically are intrusive rocks that crystallized at shallow depths, and many have compositions similar to those of [[granite]]s. A common occurrence of granophyre is within layered igneous intrusions dominated by rocks with compositions like that of [[gabbro]]. In such occurrences, the granophyre may form as an end product of [[Fractional crystallization (geology)|fractional crystallization]] of a parent mafic [[magma]], or by melting of rocks into which the mafic magma was emplaced, or by a combination of the two processes.
== See also ==
* [[Micrographic texture]]
* [[Rock microstructure]]
* [[Granite]]
* [[Eutectic]]
* [[solidus (chemistry)|Solidus]]
[[Category:Igneous rocks]]
[[Category:Petrology]]
[[Category:Volcanology]]
{{geology-stub}}
[[nl:Granofier]]