Pb loss in u pb dating
Table 2 includes original Pb/U isotope ratios from the published literature along with the slope years (i.e. The first example comes from Qinghu granite in the Nanling Range, South China  .
The Pb/U ratios in this granite are the concordant type (Figure 5(a))  .
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, China Email: [email protected] Copyright © 2015 by author and Scientific Research Publishing Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY). concentrations in minerals. However, if (is the logical operator “and”, also known as the logical conjunction), or, the line is Discordia.
Apparently, the explanations do not conform to the objective facts: the samples are in front of scientists now.
Therefore, n(The theoretical expressions for this function under different conditions are given in Section 2.4.According to conventional theories, this age indicates that the samples will experience a metamorphic process in a distant age. (2012), all zircons in HBxa from Hebi basalt are also discordant, but yield no upper intercept age.According to conventional theories, these data indicate that the samples did not crystallize until the present.Introduction In nature, uranium has three radioactive isotopes: ) ratios as the abscissa form the Pb/U ratio diagram (Figure 1).Samples formed t years ago plot on either the Concordia or Discordia lines  - .
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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).