University Of Tasmania

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Anhydrous partial melting of a fertile and depleted peridotite from 2 to 30 kb and application to basalt petrogenesis

journal contribution
posted on 2023-05-18, 08:16 authored by Trevor FalloonTrevor Falloon, David GreenDavid Green, Hatton, CJ, Harris, KL

Reversal experiments have been performed to check the method of Jaques & Green (1980) to determine equilibrium partial melts from peridotite compositions. Reversals of the Jaques & Green (1980) calculated equilibrium partial melt (CEPM) compositions have been carried out in two ways: (1) By running CEPM compositions at original P and T conditions and testing for multiple saturation in residual phases of the original experiments. (2) By sandwich/mixed experiments using the CEPM composition plus peridotite (either Hawaiian pyrolite or Tinaquillo lherzolite).

The glass (liquid) compositions from the first series of experiments show that the CEPM compositions of Jaques & Green (1980) are too olivine-rich. The glass (liquid) compositions from the second series of experiments define new olivine+orthopyroxene±clinopyroxene cotectics in a molecular normative tetrahedron. The new cotectics plot towards the Qz apex of the tetrahedron, away from the cotectics defined by the CEPM compositions of Jaques & Green (1980). Partial melt compositions have also been determined at 20 and 30 kb, using both the sandwich technique and the approach by modal analysis and mass balance.

The results of the experimental study are used to evaluate the petrogenesis of mid-ocean ridge basalts, Hawaiian tholentes and primary magmas in intraoceanic convergent margin settings.


Publication title

Journal of Petrology










School of Natural Sciences


Oxford Univ Press

Place of publication

Great Clarendon St, Oxford, England, Ox2 6Dp

Rights statement

Copyright 1988 Oxford University Press

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences