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Possible evidence for regional chemical heterogeneity of the Upper Mantle

✍ Scribed by P. C. Rickwood

Book ID
104745374
Publisher
Springer
Year
1969
Tongue
English
Weight
367 KB
Volume
24
Category
Article
ISSN
0010-7999

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✦ Synopsis

The garnets of garnet-peridotite xenoliths that occur in the kimberlites of Southern Africa and the U. S. S. 1~. are shown to differ significantly in chemical composition. It has been demonstrated that the compositions of garnets of this type depend largely on the compositions of the media in which they grew (Rickwood, Mathias and Siebert, 1968), and thus it is concluded that the Upper Mantle in these two regions differs in chemical composition. Southern Africa is a chromiferous province and the U. S. S.R. is a ferric province. * South African U.M.P. Publication No. 15.

πŸ“œ SIMILAR VOLUMES

The primary geochemistry of the monaro a
The primary geochemistry of the monaro alkaline volcanics, southeastern Australia β€” evidence for upper mantle heterogeneity
✍ S. E. Kesson πŸ“‚ Article πŸ“… 1973 πŸ› Springer 🌐 English βš– 937 KB

The Mg numbers [100 Mg/(Mg+Fe') atomic ratios] of the Tertiary Monaro alkaline volcanics in southeastern Australia indicate that many of these alkali basalts, basanites and nephelinites have undergone only limited crystal fractionation, and that a few may represent unmodified, unfractionated primary