DIFFUSION KINETICS OF PROTON-INDUCED 21NE, 3HE, AND 4HE IN QUARTZ
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dc.contributor.author | Shuster D.L. | |
dc.contributor.author | Farley K.A. | |
dc.date.accessioned | 2023-11-26T02:22:38Z | |
dc.date.available | 2023-11-26T02:22:38Z | |
dc.date.issued | 2005 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14559564 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2005, 69, 9, 2349-2359 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/41984 | |
dc.description.abstract | A natural quartz sample free of mineral and fluid inclusions was irradiated with a 200 MeV proton beam to produce spallogenic 21Ne, 3He and 4He. Temperature-dependent diffusivities of these three nuclides were then determined simultaneously by high precision stepped-heating and noble gas mass spectrometry. The outward mobility of proton-induced nuclides reflects diffusion through the quartz lattice. In the studied range of 70 to 400°C the helium diffusion coefficients exceed those of neon by 5 7 orders of magnitude. The implied diffusion parameters Ea = 153.7 ± 1.5 (kJ/mol) and ln(Do/a2) = 15.9 ± 0.3 (ln(s-1)) and Ea = 84.5 ± 1.2 (kJ/mol) and ln(Do/a2) = 11.1 ± 0.3 (ln(s-1)) for proton-induced 21Ne and 3He, respectively, indicate that cosmogenic neon will be quantitatively retained in inclusion-free quartz at typical Earth surface temperatures whereas cosmogenic helium will not. However, the neon diffusion parameters also indicate that diffusive loss needs to be considered for small... | |
dc.title | DIFFUSION KINETICS OF PROTON-INDUCED 21NE, 3HE, AND 4HE IN QUARTZ | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2004.11.002 |
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