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Granite

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A granitoid (a coarse grained igneous rock composed mostly of quartz, Kspar (alkali-feldspar) and plagioclase). More specifically a rock having an alkali-feldspar/total feldspar ratio from 0.35-0.90 on the QAPF diagram and 20-60% quartz.
A coarse grained, holocrystalline, felsic, acidic, plutonic rock.


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Classification of GraniteHide

Sub-divisions of GraniteHide

Mineralogy of GraniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteA series or subgroup of the Mica Group.
Mica > MuscoviteKAl2(AlSi3O10)(OH)2

Age informationHide

Age range:
Mesoproterozoic to Paleogene : 1301 Ma to 53.6 ± 0.8 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
153.6 ± 0.8 MaEoceneK-Ar
255.6 ± 1.0 MaEoceneK-Ar
356.1 ± 0.8 MaPaleoceneK-Ar
456.6 ± 1.0 MaPaleoceneK-Ar
558.0 ± 1.6 MaPaleoceneK-Ar
658.1 ± 1.6 MaPaleoceneK-Ar
71301 to 1241 MaEctasianK-Ar
Sample references:
IDLocalityReference
1Mourne Mts, Co. Down, Northern Ireland, UKEVANS, A. L., FITCH, F. J., & MILLER, J. A. (1973). Potassium-argon age determinations on some British Tertiary igneous rocks. Journal of the Geological Society, 129(4), 419-438.
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7Strange Lake complex, Québec & Newfoundland and Labrador, CanadaOrris, G. J., Grauch, R. I. (2002) Rare Earth element mines, deposits, and occurenes. USGS Open-File Report 02-189, 1-174.

Internet Links for GraniteHide

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