IUGS Reclassification of the High-Mg and Picritic Volcanic Rocks
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Open Access
- 1 October 2000
- journal article
- Published by Oxford University Press (OUP) in Journal of Petrology
- Vol. 41 (10) , 1467-1470
- https://doi.org/10.1093/petrology/41.10.1467
Abstract
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%.Keywords
This publication has 1 reference indexed in Scilit:
- Ferropicrites: geochemical evidence for Fe-rich streaks in upwelling mantle plumesPublished by Elsevier ,1999