Zircon-Lead Ratios

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Zircon crystals were taken in core samples from five levels of a 15,000-foot (45,720 dm) shaft in New Mexico, with temperatures always above 313 °C (595.4 °F). The sea-level boiling point of water is, of course, defined at 100 °C.

Radiogenic lead gradually diffuses out of zircon crystals, and does so more rapidly at increased temperatures. But careful examination revealed that essentially none of the radiogenic lead had diffused out of the examined zircon samples.(1)

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