Helium trapping in apatite damage:insights from overly dispersed (U-Th-Sm)/He dates
| Autor: | Recanti, Alice, Gautheron, Cécile, Barbarand, Jocelyn, Missenard, Yves, Gallagher, Kerry, Pinna, Rosella |
|---|---|
| Přispěvatelé: | Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Goldschmidt Conference 2017 Goldschmidt Conference 2017, Aug 2017, Paris, France |
| Popis: | International audience; Over the past 10 years, the effects of radiationdamage on helium diffusion kinetics werediscovered and led to significant improvements ofthe (U-Th-Sm)/He thermochronomeric system.Nevertheless, helium retention rate and closuretemperature in apatite are still debated, mostlybecause the physical nature of these defects, andtheir ability to trap helium are still unknown.Based on recent experimental analyses andquantum calculation, Gerin et al. (2017) predicthelium diffusion properties in damaged apatite. Inthis contribution, we present a new dataset ofapatite He and AFT ages, from a 300 Ma pluton(French Brittany). Using the new model, wequantify trapping behaviour in terms of energy.The AHe date dispersion for single grain withsimilar eU content may be explained by avariation in the trapping ability. We additionallypropose that damage connect and cluster for highdamage content leading to a decrease of retention.Gerin et al., 2017. Influence of vacancy damage on Hediffusion in apatite, investigated at atomic to mineralogicalscales. Geochim. Cosmochim. Acta. 197, 87-103 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|