christian dating online totally - U pb dating of zircon by la icp ms

These characteristics, and the fact that it is widespread throughout various types of rocks, suggest that the U-Th-Pb dating of xenotime has broad applications.

Studies of U-Pb dating on xenotime by ion microprobe (such as SHRIMP) have increased in recent years, whereas studies by laser ablation (LA)-ICP-MS are still rare.

u pb dating of zircon by la icp ms-27

Inclusions in zircons, as well as signal fluctuations are eliminated by removing outliers from the regression line.

Non-stoichoimetric fractionation, mass bias, machine drift, and other variation are corrected by the external standards.

A blank is measured before every analysis, and a standard is measured every 5-6 analyses.

Laser induced time-dependant elemental fractionation is corrected off-line using the regression line method (Sylvester and Ghaderi, 1997; Horn et al., 2000; Kosler et al., 2002).

The samples are magmatic rocks chosen from different geological time periods (one Paleozoic, one Mesozoic and three Cenozoic).

All zircon separates are analysed by LA-ICP-MS before and after CA, and age data are compared with CA-ID-TIMS U dates that are considered as the most accurately obtainable age.

The use of the CA technique for very young zircons (∼0.2 Ma, Kos rhyolitic tuff, Greece) seems optional; as the obtained mean U ages of non-CA and CA treated zircons coincide within the uncertainty.

Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb.

The damaged crystal parts, caused by U-decay, with lead loss are removed, so that we can exclude younging from the possible geological scenarios.

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