Abstract
Dolomite and breunnerite occur in large amounts as veins and tabular bodies in association with the Tarr albitite within late Precambrian greenschist-facies metamorphics of southeast Sinai. Isotopic data for the dolomite (mean δ 13 O = +6.9‰ ; mean δ 13 C = −8.1‰ ; mean δ D = −65‰ ; mean ϵ Nd = +3.4; mean 87 Sr 86 Sr = 0.70422 ), together with their low incompatible-element and high transition-metal contents, suggest that the dolomite derived from a mantle source. The isotopic composition of the breunnerite indicates contamination by metamorphic water during the replacement phase of the dolomite by the breunnerite.
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