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. Author manuscript; available in PMC: 2016 Jul 15.
Published in final edited form as: Meteorit Planet Sci. 2015 Jul 16;50(7):1197–1216. doi: 10.1111/maps.12461

Fig. 8.

Fig. 8

204Pb/206Pb versus 207Pb/206Pb diagram for Gujba chondrules and metal digestion steps. MT (dark square) = average modern terrestrial Pb (Stacey and Kramers 1975), PAT (triangle) = primordial Pb (defined by Tatsumoto et al. 1973), Nigeria (light square) = local Nigerian terrestrial contaminant Pb (Smith et al. 1996). Gujba chondrules dissolution steps (circles) define an isochron representative of a binary mixture of radiogenic Pb (Pbr) and terrestrial contaminant Pb (Pbc). Gujba metal dissolution steps (diamonds) regress in a line representative of a binary mixture of Pbc and primordial Pb (Pbi). Inset showing expanded Pb-Pb diagram of approximation of terrestrial contaminant Pb.