{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T16:46:00Z","timestamp":1773852360854,"version":"3.50.1"},"reference-count":25,"publisher":"American Geophysical Union (AGU)","issue":"8","license":[{"start":{"date-parts":[[2005,8,18]],"date-time":"2005-08-18T00:00:00Z","timestamp":1124323200000},"content-version":"vor","delay-in-days":17,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Geochem Geophys Geosyst"],"published-print":{"date-parts":[[2005,8]]},"abstract":"<jats:p>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 <jats:sup>4<\/jats:sup>He content around 3\u20138 10<jats:sup>\u221210<\/jats:sup> ccSTP\/g, confirming that cosmogenic helium can be extracted by crushing. The neon also shows a clear cosmogenic origin (<jats:sup>20<\/jats:sup>Ne\/<jats:sup>22<\/jats:sup>Ne down to 7.7 and <jats:sup>21<\/jats:sup>Ne\/<jats:sup>22<\/jats:sup>Ne &gt; 0.32), indicating that the cosmogenic neon can also be extracted by crushing out of the olivines. Melting of the powder left after the crushing experiment gives a <jats:sup>4<\/jats:sup>He\/<jats:sup>3<\/jats:sup>He ratio as low as 42 \u00b1 8 (R\/Ra = 17,300) and <jats:sup>21<\/jats:sup>Ne\/<jats:sup>22<\/jats:sup>Ne as high as 0.78, close to the cosmogenic production end\u2010member. This study shows that up to \u223c0.5% of cosmogenic helium and neon can be extracted by crushing. In this way, for samples that had been exposed to cosmic rays for a long time (e.g., a few Myr), a crushing procedure may not give the mantle ratios without ambiguity, and measurement of neon can help to discriminate between cosmogenic and mantle origin of the <jats:sup>3<\/jats:sup>He.<\/jats:p>","DOI":"10.1029\/2005gc000939","type":"journal-article","created":{"date-parts":[[2005,8,17]],"date-time":"2005-08-17T20:37:00Z","timestamp":1124311020000},"source":"Crossref","is-referenced-by-count":24,"title":["Cosmogenic helium and neon in 11 Myr old ultramafic xenoliths: Consequences for mantle signatures in old samples"],"prefix":"10.1029","volume":"6","author":[{"given":"Manuel","family":"Moreira","sequence":"first","affiliation":[{"name":"Laboratoire de G\u00e9ochimie et Cosmochimie, Institut de Physique du Globe de Paris Universit\u00e9 Paris VII\u2010Denis Diderot, CNRS UMR 7579  4 Place Jussieu, F\u201075005 Paris France"}]},{"given":"Pedro","family":"Madureira","sequence":"additional","affiliation":[{"name":"Laboratoire de G\u00e9ochimie et Cosmochimie, Institut de Physique du Globe de Paris Universit\u00e9 Paris VII\u2010Denis Diderot, CNRS UMR 7579  4 Place Jussieu, F\u201075005 Paris France"}]}],"member":"13","published-online":{"date-parts":[[2005,8,18]]},"reference":[{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0012-821X(03)00134-1"},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0012-821X(98)00132-0"},{"key":"e_1_2_5_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0277-3791(00)00171-2"},{"key":"e_1_2_5_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2541(02)00410-2"},{"key":"e_1_2_5_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0168-583X(00)00204-4"},{"key":"e_1_2_5_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0012-821X(93)90244-4"},{"key":"e_1_2_5_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0012-821X(99)00215-0"},{"key":"e_1_2_5_9_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRev.112.2112"},{"key":"e_1_2_5_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/349149a0"},{"key":"e_1_2_5_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2541(00)00354-5"},{"key":"e_1_2_5_12_1","doi-asserted-by":"publisher","DOI":"10.1144\/jgs.157.5.923"},{"key":"e_1_2_5_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/320435a0"},{"key":"e_1_2_5_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/297043a0"},{"key":"e_1_2_5_15_1","first-page":"213","article-title":"Helium in the Archean komatiites revisited: Significantly high 3He\/4He ratios revealed by fractional crushing gas extraction","volume":"196","author":"Matsumoto T.","year":"2002","journal-title":"Earth Sci. 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