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Wide range of diamond morphologies, inclusion types, complex N systematics In diamond host lamprophyres the matrix is inherently primitive (14 wt% Mg) ). Ongoing analysis by the Ont Geol Survey continues to find more Abitibi occurrences Timing, setting, host rocks are all well-constrainedģ Diamonds in Xenolithic Lamprophyre Dikes (2674 ± 8 Ma) and Breccia Diatremes (2679.2 ± 2.1 Ma ) In situ diamonds first found in 2.7 Ga lamprophyres near Wawa, then in an Abitibi occurrence.
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The mixed peridotitic - eclogitic character of diamond inclusions low-P inclusions (plagioclase) Shoshonitic character of the host rocks Old-source Metasomatism in sub-arc style low-Al websterites Orogenic Setting of host dikes and related plutonic and volcanic rocks & Association with Lode Gold -> All implicate a shallow diamond source that requires a cold finger effect in the Archean Upper Mantle The P-T requirements can only be met Subduction TectonicsĢ Diamond-Bearing Shoshonitic Lamprophyres 1 Diamonds in Archean Shoshonitic Lamprophyres - Conclusions
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