Garnet Zoning: An Interpretation Based on the Rayleigh Fractionation Model

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Science  30 Dec 1966:
Vol. 154, Issue 3757, pp. 1647-1651
DOI: 10.1126/science.154.3757.1647


Manganese zoning in almandine garnet is interpreted by the use of calculations based on the Rayleigh fractionation model. A close similarity of a measured manganese zoning profile and a calculated profile indicates that the assumptions used in the calculations are good. These assumptions are: complete removal of garnet from a homogeneous reservoir as the garnet crystallizes, and a nearly constant manganese fractionation factor between garnet and reservoir.