Geosonnet 41

The rock of rocks, zircon is not disturbed

As mountains grow, then wash into the sea.

Its isotopic clock is not perturbed

Providing billion year chronometry.

But like Smaug’s waistcoat, or Achillies’ heel

The Earth’s timekeeper has a fatal strain

A brine containing fluorine is ideal

For mobilizing metals from this grain

Earth’s body’s precious fluids rearrange

The normally immobile REE

And actinides, and other metals strange

To fluid induced rock mobility.

   The thermal history is not innate

   When heat producing elements migrate.

Geology 44 15

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