granophyre

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

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.


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Graphic Granite, Buckey Hills, Arizona. From Natalie Teager, Arizona State University.

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Graphic Granite, Buckey Hills, Arizona. From Natalie Teager, Arizona State University.



graphycgranite2013.jpg

Graphic Granite, Buckey Hills, Arizona. From Natalie Teager, Arizona State University.





Bibliography



• Eric A.K.Middlemost (1985): Magmas and Magmatic Rocks. Longman, London
• Ron H. Vernon (2004): A pratical guide to rock microstructure. Cambridge editore
• K.G.Cox, J.D.Bell & R.J Pankhurst (1979): The interpretetion of igneous rocks. George Allen&Unwin editori.
• David Shelley (1983): Igneous and metamorphic rocks under the microscope. Campman & Hall editori


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Photo
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
granitografico(13).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
granitografico(17).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 2x (Field of view = 7mm)
granitografico(20).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(23).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(25).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(26).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
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Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(33).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(34).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(35).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(36).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)
granitografico(37).jpg

Quartz and feldspar intergrowth in a Granophyre. XPL image, 10x (Field of view = 2mm)