oa South African Journal of Geology - Garnets as possible indicators of metamorphic grade in the Limpopo Folded Belt near Messina in the Northern Transvaal

Volume 78 Number 2
  • ISSN : 1012-0750
  • E-ISSN: 1996-8590



A plot of the (FeO + MgO)/{CaO + MnO)ratio versus the cell-edge for nine garnets from a variety of granulite facies rocks in the Limpopo Folded Belt outlines a well defined hyperbolic curve. Although the garnets are from a number of different host-rocks and show a wide range of composition, they reflect the same general PIT conditions of metamorphism; the use of Nandi's correlation curves (Nandi, 1967, pp. 89 -93) for cell-edge and composition to determine metamorphic grade is therefore suspect.

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