Trace Element and Sr-Pb-Nd-Hf Isotope Evidence for Ancient, Fluid-Dominated Enrichment of the Source of Aldan Shield Lamproites

G.R. Davies, A.J. Stolz, I.L. Mahotkin, G.M. Nowell, D.G. Pearson

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    Abstract

    A phase of Mesozoic extension associated with the termination of continental collision at the southern margin of the Aldan Shield produced ultrabasic lamproites in a discontinuous belt 500 km long and ∼150 km wide. The lamproites, locally poorly diamondiferous, were emplaced as dykes, sills and pipes. All Aldan lamproites have primitive chemical characteristics (e.g. MgO up to 22·7 wt %) and are ultrapotassic (K
    Original languageEnglish
    Pages (from-to)1119-1146
    JournalJournal of Petrology
    Volume47
    Issue number6
    DOIs
    Publication statusPublished - 2006

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