Lead lead dating

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.

Assuming the process of elemental differentiation is identical on Earth as it is on other planets, the core of these planetesimals would be depleted of uranium and thorium, while the crust and mantle would contain higher U/Pb ratios.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.Chondrules and calcium–aluminium-rich inclusions (CAIs) are spherical particles that make up chondritic meteorites and are believed to be the oldest objects in the solar system.Hence precise dating of these objects is important to constrain the early evolution of the solar system and the age of the earth.

Leave a Reply