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The uranium content of rocks is more variable than was thought, say geologists.

The finding should lead to more accurate dating of geological events.

Confined as they are in these crystals, many scientists believe that the ratio of parent radioactive uranium to daughter lead atoms in zircons can be used to calculate the ages of the crystals.

Radioisotopic dating is a key tool for studying the timing of both Earth's and life's history.

A., et des zircons bruns,a`inclusions, corrode´s, donnant 2.9–3.3 B.

A., ceci en accord avec les mesures Rb-Sr sur roches totales.

That means that in 704 million years, one gram of uranium will be reduced to ½ gram of uranium.

When solving a big problem seems impossible, break it into smaller steps.

Do zircons—crystals of zirconium silicate—contain clocks you can trust?

This releases energy (in the form of radiation) and often transforms one element into another.

For example, over time, uranium atoms lose alpha particles (each made up of two protons and two neutrons) and decay, via a chain of unstable daughters, into stable lead.

Well, scientists just took one of geology's biggest controversies and shrunk it down to atomic size.

By zapping single atoms of lead in a tiny zircon crystal from Australia, researchers have confirmed the crystal is the oldest rock fragment ever found on Earth — 4.375 billion years old, plus or minus 6 million years. Confirmation of the zircon age holds enormous implications for models of early Earth.

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