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Tholeiitic basalt

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A variety of basalt which is saturated or slightly oversaturated in silica with respect to alkalis. A silica-oversaturated (quartz-normative) basalt, characterized by the presence of low-calcium pyroxenes (orthopyroxene and/or pigeonite) in addition to clinopyroxene and calcic plagioclase. Olivine may be present in the mode, but neither olivine nor nepheline appear in the norm


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Classification of Tholeiitic basaltHide

TAS_B.png

Tholeiitic basalt is found in field B in the TAS diagram.

Sub-divisions of Tholeiitic basaltHide

Mineralogy of Tholeiitic basaltHide

Essential minerals - these are minerals that are required within the classification of this rock:
Calcic plagioclaseA petrological term for plagioclase series feldspars dominant in calcium.
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
PyroxeneA petrological term for Pyroxene Group.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Pyroxene > Clinopyroxene > Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Pyroxene > Orthopyroxene > EnstatiteMg2Si2O6
Silica > QuartzSiO2

Age distributionHide

Recorded ages:
Phanerozoic : 66.8 ± 0.3 Ma to 1.2 ± 0.1 Ma - based on 5 recorded ages.

Synonyms of Tholeiitic basaltHide

References for Tholeiitic basaltHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for Tholeiitic basaltHide

 
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