Subvolcanic rock that contains quartz and alkali feldspar in characteristic angular intergrowths
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 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. 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 meteorite impact. For example, the upper layer of the Main Mass of the 1850 Ma Sudbury Structure is composed of fine-medium grained granitic rocks with abundant granophyric textures.
^"Granophyre". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2020-03-22.
^Lowenstern, J.B.; Clynne M.A.; Bullen T.D. (1997). "Comagmatic A-Type Granophyre and Rhyolite from the Alid Volcanic Center, Eritrea, Northeast Africa". Journal of Petrology. 38 (12). Oxford University Press: 1707–1721. doi:10.1093/petroj/38.12.1707.
^McDonnell, S.; Troll, V. R.; Emeleus, C. H.; Meighan, I. G.; Brock, D.; Gould, R. J. (October 2004). "Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic sub-caldera magma chambers". Mineralogical Magazine. 68 (5): 725–738. doi:10.1180/0026461046850215. ISSN 0026-461X.
Granophyre (/ˈɡrænəfaɪər/ GRAN-ə-fire; from granite and porphyry) is a subvolcanic rock that contains quartz and alkali feldspar in characteristic angular...
igneous rock Granodiorite – Type of coarse grained intrusive igneous rock Granophyre – Subvolcanic rock that contains quartz and alkali feldspar in characteristic...
of sub layer norite, mafic norite, felsic norite, quartz gabbro, and granophyre.[citation needed] The Whitewater Group consists of a suevite and sedimentary...
SW) with the latter two located on the Llyn Peninsula. The St Davids Granophyre and the Pebidian Supergroup are located on the coastline of St Davids...
unlike composition. A composite dike can include rocks as different as granophyre and diabase. While there is often little visual evidence of multiple injections...
after the Adirondack Mountains. The bedrock of the Misquah Hills is a granophyre within the Duluth Complex, a relatively recent addition to the larger...
exposed at the surface. Intrusions of this age include the Ennerdale Granophyre and the Eskdale Granite. The later granites were intruded during the Early...
around 563 million years ago. A variety of the intrusive igneous rock granophyre, known as Ercallite forms the northeastern shoulder of the Ercall. It...
intrusive granophyre which is pink. The relationship between the Ercall Granophyre and the Uriconian is also clearly evident as the Granophyre intrudes...
rise to characteristic intergrowth textures exhibited, for example, by granophyre. Some inks are eutectic mixtures, allowing inkjet printers to operate...
as well as inclusions of diabase, quartz diorite, granite, aplite, and granophyre. Ashfall layers have been eroded by pyroclastic flows and with time, but...
gabbros and anorthosites in the upper layers. Some include diorite, and granophyre near the top of the bodies. Orebodies of Nickel-Copper-Platinum group...
8 km-thick layered mafic-ultramafic cumulate sequence), and the Rashoop Granophyre Suite (granophyric rocks). These are exposed as layered sequences of sheet...
gabbro and an upper red layer that more closely resembles granite (called granophyre). There is no major transition in between, as would have been expected...
Some micrographic intergrowths are similar to those characteristic of granophyre. Micrographic differs from graphic granite in being so much finer-grained...
in the forms of their non-extrusive equivalents such as granophyre and rhyolite. Granophyre is quite evident in the Ercall Quarries. The sediments and...
with the Saratoga Gabbro cumulates overlain by the 300 m thick Lexington Granophyre. "Stratigraphy of the layered gabbroic Dufek Intrusion, Antarctica -...
are relatively rare rocks that include diorites, monzodiorites, and granophyres. They consist of quartz, plagioclase, orthoclase or alkali feldspar,...
Rock types include picrite, peridotite, dunite, pyroxenite, gabbro and granophyre. A feeder dike of olivine gabbro is exposed "below" the now tilted sequence...
exception being the replacement of deformed plagioclase in anorthosite. Granophyre Rock microstructure Granite Eutectic Solidus Symplectite Perchuk, L. L...
Ennerdale Water with steep crags and scree which are composed of pink granophyre rock which give these slopes a reddish tinge (see picture). Approximately...
underneath very hard igneous rock is dark grey-green coloured, and composed of granophyre, gabbo, dolerite, and granite. The traditional owners of the Murujuga...
differentiated sequence of intrusive volcanic rocks – norite, gabbro and granophyre – overlain by breccias and metasedimenary rocks.: 1890 The sublayer consists...
Global Information