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Synopsis: Analysis of a Metallic Specimen7 Figure 7. Lead (Pb) isotope systematics of the unknown material, shown relative to other terrestrial and non-terrestrial materials in 206Pb/204Pb vs. 207Pb/206Pb. This plot has three end-member compositions: (1) primordial lead, which is the starting composition of the lead in the solar system; (2) pure radiogenic lead from the decay of naturally occurring uranium; and (3) terrestrial lead or “common lead,” which is defined by repeat analyses. The specimen has a lead isotopic composition that plots precisely in the field of terrestrial lead compositions. SRM stands for standard reference material, materials typically used to perform instrument calibrations due to their well-characterized composition or properties, as measured and certified by the U.S. Department of Commerce’s National Institute for Standards and Technology. 0.000 0.000 0.200 0.400 0.600 0.800 1.000 1.200 1.400 0.020 0.040 0.060 0.080 0.100 0.120 207Pb/206Pb 204Pb/206Pb Silver Coins Industrial Pb Galena Airborne Particulate Matter Feldspars Meteorite Troilite Mars SRM-982 measured SRM 982 SRM 981 SRM 983 Pacific Ocean Sulfides Lunar Glasses Gasoline Sample A
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