Open Journal of Geology

Volume 5, Issue 5 (May 2015)

ISSN Print: 2161-7570   ISSN Online: 2161-7589

Google-based Impact Factor: 1.46  Citations  

Slope Year for the U-Pb Dating Method and Its Applications

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DOI: 10.4236/ojg.2015.55032    6,212 Downloads   7,336 Views  Citations
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ABSTRACT

The slope year tslope for the U-Pb dating method is given as , where λ238 and λ235 are the decay constants for 238U and 235U, respectively, and k is the slope of the tangent line at a point on either the Concordia or Discordia line. These two lines are determined by the initial 206(7)Pbi concentrations in minerals. If , the line is the Concordia. However, if (∧ is the logical operator “and”, also known as the logical conjunction), or , the line is Discordia. The Concordia line is of the form (where p stands for the present), while the Discordia line has the form (where k and b are the slope and intercept of the straight line, respectively).

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Yuan, J. (2015) Slope Year for the U-Pb Dating Method and Its Applications. Open Journal of Geology, 5, 351-366. doi: 10.4236/ojg.2015.55032.
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