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Pb pb isochron dating

These plots are also self-checking and are useful for dating old rocks with complex histories.

The plots can still produce valuable and accurate data using rocks that have been subjected to heating and metamorphic events (Dalrymple 20).

An example isochron from Dalrymple (2004) is shown in Figure 4.8 below. Unlike other isochrons, the slope of the Pb-Pb isochron decreases with increasing age.

First, measuring the isotope ratio of a single element can be done much more precisely than measuring isotope ratios of two differing elements.

The first is that it requires single-stage leads, which are systems that begin at some initial lead composition and remain on the same growth curve throughout their histories (Dalrymple 209).

The second requirement is that assumptions about the genetic relationship between the Earth and meteorites must be made.

Another situation in which single-stage systems give unreliable information is the extraction of lead from uranium to form lead ore.

It is possible that a system could undergo a geological process that extracts lead, leaving the new system without any uranium.

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The concept of common Pb–Pb dating. The ratio plotted on this axis is the 207 Pb/ 206 Pb ratio, corresponding to the slope of a normal Pb/Pb isochron. 
24-Jun-2018 03:50
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An excellent semi-technical introduction to isotope dating methods with an emphasis on isochron and Pb isotope dating is available in Dalrymple 1991. 
24-Jun-2018 03:54
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The result of U-corrected Pb-Pb dating has produced ages of Lead isochron dating supports the idea that CAIs crystallization and chondrule formation occurred around. 
24-Jun-2018 03:57
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As with other isochron methods, the U-Pb isochron method has been questioned in the open literature, because often an excellent line of best fit between ratios. 
24-Jun-2018 04:01
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Pb pb isochron dating introduction

Pb pb isochron dating

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