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Basalt

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A mafite containing mostly calcic plagioclase, clinopyroxene +/- olivine, foids, oxides and rarely quartz.

A general term for fine grained, mafic (dark-colored) igneous rocks, commonly extrusive (volcanic) but locally intrusive (e.g., as dikes or pipes), composed chiefly of plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Olivine and and iron-titanium oxides are very common and nepheline, orthopyroxene, or quartz may be present. Adj. basaltic.


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Classification of BasaltHide

Sub-divisions of BasaltHide

Mineralogy of 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.
PyroxeneA petrological term for Pyroxene Group.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
Olivine(Mg,Fe2+)2SiO4
Silica > QuartzSiO2

Age informationHide

Age range:
Paleogene : ~60.5 Ma to ~54.5 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1~60.5 to ~54.5 MaPaleogeneAr/Ar & Pb/U
Sample references:
IDLocalityReference
1Magheramorne Quarry, Larne, Co. Antrim, Northern Ireland, UKJolley, D. W.; Bell, B. R. (1 January 2002). "The evolution of the North Atlantic Igneous Province and the opening of the NE Atlantic rift". Geological Society, London, Special Publications. 197 (1): 1–13. Bibcode:2002GSLSP.197....1J. doi:10.1144/GSL.SP.2002.197.01.01. 40Ar/39Ar and Pb-U isotopic age data show that the main period of continental flood basalt volcanism in the NAIP extended from ~60.5 Ma through to ~54.5 Ma.

Varieties of BasaltHide

Glassy basaltA glassy volcanic rock of basaltic composition.

Basalt in petrologyHide

An essential component of (items highlighted in red)

Internet Links for BasaltHide

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