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The PT-phase relations of an MgO-rich Hawaiian tholeiite: the compositions of primary Hawaiian tholeiites

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Abstract

The PT-phase relations of a Hawaiian tholeiite with 18.2% MgO has olivine–orthopyroxene multiple saturation at 20.5 kbar and 1,550°C. This pressure is less than the pressure at the lithosphere/asthenosphere transition, and it is suggested that tholeiites with this and lesser MgO contents are fractionated. Assuming a harzburgitic residuum it is shown that Hawaiian primary tholeiites contain about 23% MgO, and are generated at 36±5 kbar and 1,680±50°C. This pressure is equivalent to a depth of 112 km, which is consistent with the thickness of the lithosphere and thermal plume modeling. The minimal MgO content of primary Hawaiian tholeiites is suggested as 19% MgO.

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Acknowledgements

JM Rhodes kindly provided the major element analyses for the submarine tholeiitic basalts. This work is part of the SUBMAR project supported by the Norwegian Research Council.

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  1. Department of Geosciences, Allegaten 41, 5007, Bergen, Norway

    S. Maaløe

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Maaløe, S. The PT-phase relations of an MgO-rich Hawaiian tholeiite: the compositions of primary Hawaiian tholeiites. Contrib Mineral Petrol 148, 236–246 (2004). https://doi.org/10.1007/s00410-004-0601-3

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