Granophyre

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Cross-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)

Granophyre (/ˈɡrænəfaɪər/ GRAN-ə-fire;[1][2] from granite and porphyry) is a subvolcanic rock that contains quartz and alkali feldspar in characteristic angular intergrowths such as those in the accompanying image.

The

eutectic point, perhaps in the presence of a water-rich phase. They may also be formed by crystallization when the magma is significantly undercooled, not necessarily under eutectic conditions.[3]

Granophyres typically are intrusive rocks that crystallized at shallow depths, and many have compositions similar to those of granites.[4] 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 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.

Granophyre may also form as the uppermost stratigraphic layer resulting from melting of upper-middle crustal rocks by a

Sudbury Structure
is composed of fine-medium grained granitic rocks with abundant granophyric textures.

See also

  • Micrographic texture
  • Rock microstructure
     – size, shape and mutual relations of the particles of a rock
  • Granite – Type of igneous rock
  • Eutectic
     – Mixture with a lower melting point than its constituents
  • Solidus

References

  1. ^ "Granophyre". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2020-03-22.
  2. ^ "Granophyre". Merriam-Webster.com Dictionary. Retrieved 2016-01-23.
  3. doi:10.1093/petroj/38.12.1707
    .
  4. ISSN 0026-461X
    .
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