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Alkali basalt

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About Alkali basaltHide

A term used for basalts containing accessory foids, typically nepheline. Such rocks generally contain plagioclase and augite and olivine as their main ferromagnesian phases. Defined as a variety of basalt within TAS field B which contains normative nepheline, or as field 10’ in the QAPF diagram.


Classification of Alkali basaltHide

QAPF_V_10-.png

Alkali basalt appears in field 10' in the QAPF diagram.

TAS_B.png

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

Sub-divisions of Alkali basaltHide

Mineralogy of Alkali 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.
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
Feldspathoid > NephelineNa3K(Al4Si4O16)
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6

Age distributionHide

Recorded ages:
Phanerozoic : 67.7 ± 0.7 Ma to 0.71 ± 0.18 Ma - based on 5 recorded ages.

Synonyms of Alkali basaltHide

Internet Links for Alkali basaltHide

 
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