alkalic


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alkalic

[‚al′kal·ik]
Also known as alkali.
(petrology)
Of igneous rock, containing more than average alkali (K2 O and Na2O) for that clan in which they are found.
Of igneous rock, having feldspathoids or other minerals, such as acmite, so that the molecular ratio of alkali to silica is greater than 1:6.
Of igneous rock, having a low alkali-lime index (51 or less).
References in periodicals archive ?
Lavas recovered from Bowie seamount range from alkalic basalt and basanite through hawaiite, mugearite and benmoreite (Engel et al.
The steep pattern with a negative slope is characteristic of alkalic basalts produced by partial melting of garnet bearing material (Ragland, 1989), where the HREE are retained in garnet relative to LREE.
2) that was assigned the name "litchfieldite" by Bayley (1892), is part of a composite alkalic plutonic complex (Barker 1965) that occupies an area of approximately 7 [km.
Two suites, or collections of magmas, known as alkalic and subalkalic, can be distinguished on the basis of their alkali content ([Na.
1987) Petrology of the alkalic hypabyssal and volcanic rocks at Cripple Creek, Colorado.
The postshield volcanic lavas and tephra underlying the three older sites are considered more alkalic (higher content of basic cations) than the shield-stage lavas and tephra (Clague and Dalrymple 1989) upon which the two youngest sites have developed.
These rocks were coevally (simultaneously) intruded by granitic rocks of alkalic (syenite) and calc-alkalic (quartz monzonite) compositions.
Glacial dispersal from the Strange Lake alkalic complex, northern Labrador.