Dating brunets

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The magnitude of the latter process is tightly linked to the geochemical and the hydrogeological contexts at the time of the sedimentary deposition.

To apply the radioactive decay equation described above, it is thus essential to know the regional initial authigenic Be ratio.

Mammal fossil assemblages unearthed from argillaceous sandstone levels at Koro Toro (KT 12) and Kollé (KL) allowed a biochronological estimation of their deposition age of 3–3.5 Ma and 4–5 Ma (3–4, 34), respectively.This opens up the possibility to date sedimentary deposits in the range of 0.2 to 14 Ma.Much as is the case with B, which is undistinguishable from common boron.This is unlike most other radiochronological methods (U-Th, Rb-Sr, Sm-Nd, K-Ar, Lu-Hf, Re-Os, etc.) that rely on parent–daughter ratios to determine ages.In addition, because the absolute Be concentration depends also on parameters such as the scavenging efficiency and the specific surface area of the sedimentary particles, it cannot be used directly to determine an age.

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