论文信息 - Inclusions of (Mg,Fe)O in mantle diamonds

Inclusions of (Mg,Fe)O in mantle diamonds

Introduction Accepting the general evidence that mantle rock chemical compositions are dominantly peridotitic or eclogitic, oxides of the MgO-FeO (periclase-wustite) solid solution series are only expected under normal mantle physical conditions at depths equal to, or greater than, those of the breakdown of the (Mg,Fe)2Si04 polymorphs at the boundary between upper and lower mantle. Since the (Mg.Fe)O inclusions occurring in diamonds are dominantly Mg-rich we shall refer to them as ferropericlase (fPer). Inclusions of fPer in diamonds are recorded from at least nine localities: Orroroo, Monastery, Koffiefontein, Sloane, Sao Luiz, River Ranch, Letseng-La-Terai, Guinea and Mwadui. At present, Sao Luiz dominates the recorded sample and it is the Sao Luiz fPer inclusions which are of particular concern in this paper.

B. Harte | M. Hutchison | M. Lee | J. Harris

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