Hf-W isochron

Figure 10.8 Combined Hf-W isochron for various CAIs. Symbols indicate different fractions separated from CAIs, which all yield identical ages within uncertainties. The gray triangles show data for different separates from a single Allende CAI (ALL-MS-1) and thus define an internal isochron for this particular inclusion. The absolute age (4568.3 + 0.7 Ma) of this sample was obtained relative to absolute Pb-Pb ages for angrites (see [93] and references therein for more details), m initial ratio of CAIs i initial of CAIs. Adapted from [93].

Burkhardt, C., Kleine, T., Bourdon, B. et al. (2008) Hf-W mineral isochron for Ca, Al-rich inclusions age of the solar system and the timing of core formation in planetesimals. Geochimica et Cosmochimica Acta, 72, 6177—6197. 

---