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Journal of Petrology Volume 41 Number 10 Pages 1467-1470 2000
© Oxford University Press 2000

IUGS Reclassification of the High-Mg and Picritic Volcanic Rocks

M. J. LE BAS,*

SCHOOL OF OCEAN AND EARTH SCIENCE, SOUTHAMPTON UNIVERSITY, SOUTHAMPTON SO14 3ZH, UK

The 1989 IUGS classification of the igneous rocks for the high-Mg and picritic volcanic rocks has been revised. Instead of an 18 wt % MgO minimum limit being applied for all high-Mg and picritic volcanic rocks, that is now applicable only to the high-Mg rocks such as komatiite and meimechite. The minimum MgO requirement for picrite is reduced to 12 wt %. The SiO2 former boundary figure between boninite and komatiite–meimechite–picrite, which was 53 wt %, is reduced to 52 wt %, and the total alkali content for komatiite and meimechite is increased to 2% and for picrite to 3%.

KEY WORDS: picrite; high-Mg; classification


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