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U-Pb

U-Pb. The Decay. 238 U ? 206 Pb ? = 1.551 x 10 -10 a -1 therefore t 1/2 = 4.47 Ga ? & ? decays 235 U ? 207 Pb ? = 9.849 x 10 -10 a -1 therefore t 1/2 = 707 Ma ? & ? decays 238 U much more abundant than 235 U (137.88x). ln2/ ?. ln2/ ?. What controls the rate?.

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GEOCHRONOLOGY 2008 Lecture 07 Common Lead Dating

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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Common pb - PowerPoint PPT Presentation

U-Pb

GEOCHRONOLOGY 2008 Lecture 07 Common Lead Dating