peralkaline

ALASKA VOLCANO OBSERVATORY GLOSSARY
Igneous rocks in which the molecular proportion of aluminum oxide is less than that of sodium and potassium oxides combined.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

Look at other dictionaries:

  • peralkaline — adjective Describing igneous rocks that have a higher ratio of sodium and potassium to aluminium than is needed to produce feldspar …   Wiktionary

  • peralkaline — per·alkaline …   English syllables

  • peralkaline — |pər., (ˈ)per+ adjective Etymology: per + alkaline : having a molecular proportion of alumina less than that of soda and potash combined used of an igneous rock …   Useful english dictionary

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  • Northern Cordilleran Volcanic Province — NCVP …   Wikipedia

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