Cosmogenic 3he helium age dating
The presence of a ‘trapped’ component (neon plotting above the mixing line between atmospheric and cosmogenic components, the so-called ‘spallation line’; Niedermann, 2002) indicates that pre-exposure degassing was insufficient, and that the quartz did not reach the 600 C degassing temperature of neon (Niedermann, 2002).
Production rates were scaled to sea level and high latitude and agree well with previous determinations on natural calibration sites (Section 6). Ph D thesis, School of Earth Sciences, The University of Melbourne. Calibration of the cosmogenic 21Ne exposure dating technique for application to Quaternary volcanic chronology.However, errors associated with cosmogenic exposure ages are typically either poorly specified or relatively high compared to other more established dating methods.This is dominantly due to large systematic uncertainties.