Upb dating

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organisms, geologists employ a variety of techniques.

The age of apatite grains can be calculated by plotting their U-Pb isotopic composition to form a discordia line.

Apatite has a lower closure temperature than zircon, i.e., ~400 - 500°C, and so are more easily ‘reset’ by heating than zircons.

The laser ablation pit sizes ranged from 30 to 40 μm in diameter.

Laser-induced time-dependent fractionation is corrected by normalizing measured ratios in both standards and samples to the beginning of the analysis using the intercept method.

In this study we used LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry) to determine U-Pb ages of 5 zircon samples of known age (˜1800 Ma to ˜50 Ma) in order to determine the reproducibility, precision, and accuracy of this geochronologic technique.

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