IUGS reclassification of the high-Mg and picritic volcanic rocks

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Authors:Le Bas, M. J.
Author Affiliations:Primary:
Southampton University, School of Ocean and Earth Science, Southampton, United Kingdom
Volume Title:Journal of Petrology
Source:Journal of Petrology, 41(10), p.1467-1470. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2000
Note:In English. 4 refs.; illus.
Summary:The 1989 International Union of Geological Sciences classification of high-Mg and picritic volcanic rocks has been revised. Instead of an 18 wt.% MgO minimum being applied for all high-Mg and picritic volcanic rocks, that value is now applicable only to the high-Mg rocks such as komatiite and meimechite. The minimum MgO for picrite is reduced to 12 wt.%. The SiO2 boundary value between boninite and komatiite-meimechite-picrite has been reduced from 53 to 52 wt.%, and the total alkali content for komatiite and meimechite is increased to 2 wt.% and for picrite to 3 wt.%. [B.E.L.]
Subsections:Igneous petrology
Subjects:Alkaline earth metals; Associations; Classification; Geochemistry; Igneous rocks; IUGS; Komatiite; Lithogeochemistry; Magnesium; Meimechite; Metals; Picrite; Ultramafic composition; Volcanic rocks
Abstract Numbers:01M/2135
Record ID:2001005444
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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