peraluminous


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peraluminous

[‚pər·ə′lü·mə·nəs]
(petrology)
Of igneous rock, having a molecular proportion of aluminum oxide greater than that of sodium oxide and potassium oxide combined.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Irber, W.: 1999, The lanthanide tetrad effect and its correlation with K/Rb, Eu/Eu*, Sr/Eu, Y/Ho, and Zr/Hf of evolving peraluminous granite suites.
Abdel-Rahman AFM (2001) Peraluminous plutonism: nature and origin of the Moly May leucogranite and its Coast Plutonic Complex granitic host-rocks, northwestern British Columbia.
Analysis revealed that these rocks have high K calc-alkaline affinity, whereas high alumina to silica ratio in these rocks infers them to be metaluminous to peraluminous. Quartzofeldspathic veins and sulfide mineralization zones within the Chakdara granite gneisses have economically low concentration of Au, Ag and base metals.
(1999): Mafic precursors, peraluminous granitoids, and late lamprophyres in the Avila batholith, A model for the generation of Variscan batholiths in Iberia.