Cosmogenic helium and neon in 11 Myr old ultramafic xenoliths: Consequences for mantle signatures in old samples

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Moreira, Manuel, Madureira, Pedro
• Other Authors: Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2005
• Subjects: cosmogenic; crushing; helium; mantle; neon; [SDU]Sciences of the Universe [physics]; Antarc*; Antarctica; West Antarctica
• Online Access: https://insu.hal.science/insu-03601115; https://insu.hal.science/insu-03601115/document; https://insu.hal.science/insu-03601115/file/Geochem%20Geophys%20Geosyst%20-%202005%20-%20Moreira%20-%20Cosmogenic%20helium%20and%20neon%20in%2011%20Myr%20old%20ultramafic%20xenoliths%20Consequences%20for.pdf; https://doi.org/10.1029/2005GC000939

International audience The helium and neon isotopic compositions of olivines coming from a 11 Myr old xenolith sampled at Mt. Hampton (West Antarctica) were analyzed by crushing. The helium isotopic ratio varies between 1340 and 6300 (R/Ra between 115 and 539) with 4 He content around 3-8 10 -10 ccS...