Tektites dating – determining the age of moldavites

Potassium–argon dating (K–Ar) method

Noble-gas mass spectrometer for K-Ar dating

Noble-gas mass spectrometer for K-Ar dating
Source: Japan Atomic Energy Agency

It is suitable as tectites (natural glass) usually contain quite high amount of potassium (including radioactive potassium 40). The amount of potassium is determined by mass spectometer. In the same way the amount of argon 40 can be measured. The date of origin of  natural glass can be calculated from the measured figures.
The age of Moldavites was determined by the use of the above method to be 14.7 million years.

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Fission track dating

Fussion Track Lab

Fussion Track Lab
University of Arizona – Dr. Stuart N. Thomson

When uranium cores fall apart, particles with high kinetic energy are created. Such particles go through glass and leave a track 0.01 mm long (i.e. microscopic area of disruption). We can determine the age of glass by the number of tracks in a volume unit.
The age of Moldavites was determined by the use of the above method to be 14.7 million years.

Fission Tracks

Fussion Tracks
Source: Geotrack International Pty Limited, Melbourne.

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