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Syenite

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A granitoid having an alkali-feldspar/plagioclase ratio from 0.35-0.1 and <5% quartz


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Classification of SyeniteHide

Sub-divisions of SyeniteHide

Mineralogy of SyeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
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.

Age informationHide

Age range:
Paleoproterozoic to Permian : 1740 Ma to 261 ± 6 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1256 ± 6 to 261 ± 6 MaLopingianWhole rock K/Ar
21740 to 1720 MaStatherianU-Pb
Sample references:
IDLocalityReference
1Dalsfjorden, Askvoll, Sogn og Fjordane, NorwayFurnes, H., Mitchell, J.G., Robins, B., Ryan, P., Skjerlie, F. J. (1982): Petrography and geochemistry of peralkaline, ultrapotassic syenite dykes of Middle Permian age, Sunnfjord, West Norway. Norsk Geologisk Tidsskrift, 62, 147-159.
2Yastrebets Massif, Ukrainian Shield, Dnipropetrovs'k Oblast', UkraineOrris, G. J., Grauch, R. I. (2002) Rare Earth element mines, deposits, and occurenes. USGS Open-File Report 02-189, 1-174.

Internet Links for SyeniteHide

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