IUGS reclassification of the high-Mg and picritic volcanic rocks

被引:473
作者
Le Bas, MJ [1 ]
机构
[1] Univ Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England
关键词
picrite; high-Mg; classification;
D O I
10.1093/petrology/41.10.1467
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
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 note, 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%.
引用
收藏
页码:1467 / 1470
页数:4
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