Hence the best age for the original formation of the solar system is 4567.7 My.
Therefore, the most precise dating method for these meteorites is the Pb–Pb method, which allows a correction for common Pb.
Pb is relatively low, this isotope has larger measurement errors than the other Pb isotopes, leading to very strong correlation of errors between the measured ratios.
Stony meteorites however, exhibited very high Pb ratios, indicating that these samples came from the crust or mantle of the planetesimal.
Together, these samples define an isochron, whose slope gives the age of meteorites as 4.55 Byr.
As illustrated in figure 1, this point defines the lower (left) end of the isochron.
Therefore, troilite found in Canyon Diablo represents the primeval lead isotope composition of the solar system, dating back to 4.55 /- 0.07 Byr.As planetesimals collided, various fragments were scattered and produced meteorites.Iron meteorites were identified as pieces of the core, while stony meteorites were segments of the mantle and crustal units of these various planetesimals.Lead–lead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite.For most dating requirements it has been superseded by uranium–lead dating (U–Pb dating), but in certain specialized situations (such as dating meteorites and the age of the Earth) it is more important than U–Pb dating. As evident by the equation, initial Pb isotope ratios, as well as the age of the system are the two factors which determine the present day Pb isotope compositions.This supports the idea that CAIs crystallization and chondrule formation occurred around the same time during the formation of the solar system.