(petrology) A visibly crystalline plutonic rock composed chiefly of sodic plagioclase, alkali feldspar, quartz, and subordinate dark-colored minerals.
Granodiorite
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(¦gra·nō′dī·ə′rīt)
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A phaneritic (visibly crystalline) plutonic rock composed chiefly of sodic plagioclase (oligoclase or andesine), alkali feldspar (microcline or orthoclase, usually perthitic), quartz, and subordinate dark-colored (mafic) minerals (biotite, amphibole, or pyroxene). Granodiorite is intermediate between granite and quartz diorite (tonalite). For convenience granite and granodiorite are commonly grouped and referred to as granite. See also Granite;
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Granodiorite (pronounced /ˌɡrænɵˈdaɪ.ɵraɪt/ or /ˌɡreɪnɵˈdaɪ.ɵraɪt/) is an intrusive igneous rock similar to granite, but contains more plagioclase than potassium feldspar. It usually contains abundant biotite mica and hornblende, giving it a darker appearance than true granite. Mica may be present in well-formed hexagonal crystals, and hornblende may appear as needle-like crystals.
On average the upper continental crust has the same composition as granodiorite.
Granodiorite is a plutonic igneous rock, formed by an intrusion of quartz-rich magma, which cools in batholiths or stocks below the Earth's surface. It is usually only exposed at the surface after erosion and uplift have occurred.
The Rosetta Stone was carved out of granodiorite, and Plymouth Rock was a glacial erratic of this kind.
External links and references
This article incorporates public domain material from the United States Geological Survey document "Granodiorite definition".
Media related to Granodiorite at Wikimedia Commons
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 | gneissic granodiorites (petrology) |
| alsbachite (petrology) |
| granogabbro (petrology) |
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Mentioned in
- gneissic granodiorites (petrology)
- alsbachite (petrology)
- granogabbro (petrology)
- Granite (mineralogy and petrology)
- Hornblende
- Quartz (mineralogy and petrology)
- Trondhjemite
- Rhyodacite
- TTG
- Patagonian batholith
- Stone Mountain (North Carolina)
- NIST stone test wall
- Tonalite-Trondhjemite-Granodiorite
- Pluton
