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L’authentification d’objets en or est un problème majeur, car l’or est probablement le matériau le plus difficile quand il s’agit de détecter des contrefaçons modernes.En 1996 nous avons publié les résultats d’une étude de cristaux d’or faux et authentiques de la mine d’or de Santa Elena, au Venezuela, et nous avons montré que la méthode de datation U/Th – He est un outil puissant pour détecter les contrefaçons dans le cas des objets en or.We contracted with a high-precision laboratory to measure the rate of helium diffusion out of the zircons. Here we report newer zircon diffusion data that extend to the lower temperatures (100º to 277º C) of Gentry's retention data.The measured rates resoundingly confirm a numerical prediction we made based on the reported retentions and a young age.Using (U-Th)/He thermochronology in this way we work with a wide range of geomorphologists and tectonicists to address problems related to uplift, erosion, faulting, and other orogenic issues.He dating is also used in a wide range of other applications, including dating young volcanic rocks, estimating meteorite thermal histories, thermal histories of sedimentary basins, and tracing the effects of wildfire on the earth's surface.Experiments co-sponsored by the Creation Research Society show that helium leakage deflates radioisotopic ages.In 1982 Robert Gentry found amazingly high retentions of nuclear-decay-generated helium in microscopic zircons (Zr Si O crystals) recovered from a borehole in hot Precambrian granitic rock at Fenton Hill, NM.

direct dating of gold by radiogenic helium-68direct dating of gold by radiogenic helium-43direct dating of gold by radiogenic helium-27

These different sources of He to the atmosphere (Wuest et al., 1992), and will similarly lead to underestimates of ground-water ages (Schlosser et al., 1989).He age of t = 0 should occur at the water table, and ages should increase with depth as ground water becomes older.In the case of a fluctuating water table, t = 0 is set at the seasonal low water table position (Solomon et al., 1993).This suggestion was experimentally supported by the investigation of the kinetics of radiogenic helium release from native gold. The first results of the U-Th-He dating of native gold from the Pedrolampi (central Karelia) and Witwatersrand (South Africa) deposits are in adequate agreement with available independent geochronological data.




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