granophyre
/ˈɡranə(ʊ)ˌfʌɪə
/noun [mass noun] Geology
A granitic rock consisting of intergrown feldspar and quartz crystals in a medium- to fine-grained groundmass.Here, the 24-foot-thick bed strikes E-W, dips 25 [degrees] N., and is composed of subangular-to-rounded clasts composed of granophyre, rhyolite, and basalt....
- The Main Channel conglomerate is made up of a variety of well-rounded felsite, granophyre, and quartz-feldspar porphyry pebbles, suggesting a geologically diverse source terrane.
- Although the features described above are present everywhere in the partially melted gneiss, grain boundary films of fine granophyre also occur in about a third of the partially melted samples from Priomh-lochs.
Derivatives
granophyric
- Sample CHA 3005 was taken from one of these rhyolite domes; it has miarolitic cavities and a conspicuous graphic and granophyric fabric.
- The first sign of melting in thin-section is the development of fine granophyric rims on grain boundaries between quartz and feldspar, interpreted to be solidified quartzo-feldspathic melt.
- The rounded conglomerate pebbles consist of siltstone, mudstone, wacke, granophyric igneous rocks, and various intermediate to felsic volcanic rocks, set in a matrix rich in quartz and feldspar grains.
Origin
Late 19th century: from German Granophyr, from Granit 'granite'+ Porphyr (see porphyry).
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