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separate mantle convection, whereas if the shallower
assemblages discussed represent ponded subducted ma-
terial their presence supports at least a transient upper/
lower-mantle boundary.
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Acknowledgements Sopemi and the Diamond Trading Company
are thanked for providing the Juina diamonds used in this study.
John Craven and Richard Hinton, and Pete Hill and Stuart Kearns
provided electron probe and SIMS support respectively. Ben Harte
and Je Harris are gratefully acknowledged in their capacity as Irifune T, Ringwood AE )1987) Phase transformations in primitive
supervisors. The manuscript also bene®ted from discussion with
Lucianno Secco, Tibor Gasparik, Mike Drake and Julie Hollis.
This research was supported by a Natural Environment Research
MORB and pyrolite compositions to 25 GPa and some geophys-
ical implications. In: Manghnani MH, Syono Y )eds) High pres-
sure research in mineral physics. Terrapub, Tokyo, pp 231±242
Council postgraduate grant to M.T.H. whilst attending the Uni- Irifune T, Koizumi T, Ando J-I )1996) An experimental study of
versity of Edinburgh, and manuscript preparation and revision was
supported by National Science Foundation grants EAR 9706024
and EAR 0001945.
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