GEOCHRONOLOGY 2008 Lecture 07 Common Lead Dating. Common Lead vs Radiogenic Lead. Pb derived from decay of U and Th is described as radiogenic lead. In a system containing U and Th, the isotopic composition of Pb is controlled by the decay of the U and Th parent isotopes
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Isotope ratios of Pb in troilite of the iron meteorite Canyon Diablo, ie equivalent to initial values
206Pb/204Pb = a0 207Pb/204Pb = b0 208Pb/204Pb = c0 Reference
9.307 10.294 29.476 Tatsumoto et al., 1973
9.3066 10.293 29.475 Chen and Wasserburg (1983)