Complex exposure histories for meteorites with “short” exposure ages

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dc.contributor.authorHerzog, GFen_AU
dc.contributor.authorVogt, Sen_AU
dc.contributor.authorAlbrecht, Aen_AU
dc.contributor.authorXue, Sen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorKlein, Jen_AU
dc.contributor.authorMiddleton, Ren_AU
dc.contributor.authorWeber, Hen_AU
dc.contributor.authorSchultz, Len_AU
dc.date.accessioned2021-10-28T01:28:55Zen_AU
dc.date.available2021-10-28T01:28:55Zen_AU
dc.date.issued1997-05en_AU
dc.date.statistics2021-10-21en_AU
dc.description.abstractWe report measurements of 26Al and 10Be activities in nine ordinary chondrites and of the light noble gas concentrations and 36Cl and 41Ca activities in subsets of those meteorites. All but Murray have low 21Ne concentrations (<1.0 × 10−8cm3STP/g) and have previously been used to estimate 21Ne production rates. Ladder Creek, Murchison, Sena, and Timochin have inventories of cosmogenic radionuclides that are compatible with a single stage of irradiation and give 21Ne production rates that are consistent with the standard L-chondrite value of 0.33 × 10−8cm3STP/g/Ma. In contrast, Cullison, Guenie, Shaw, and Tsarev experienced complex irradiation histories. They and several other meteorites with low nominal exposure ages also have lower 3He/21Ne ratios than expected based on their 22Ne/21Ne ratios. A general association between low 21Ne contents and 3He losses suggests that meteorites with short lifetimes often occupy orbits with small perihelia. However, meteorites with low 21Ne contents, one-stage exposure histories, and losses of cosmogenic 3He are rare. Possible explanations for the scarcity are (1) statistical, (2) that it is harder for more deeply buried protometeoroids to lose gas in a liberating collision, and (3) that it is harder to insert more deeply buried protometeoroids directly into orbits with small perihelia. © 1999-2021 John Wiley & Sons, Inc.en_AU
dc.identifier.citationHerzog, G. F., Vogt, S., Albrecht, A., Xue, S., Fink, D., Klein, J., Middleton, R., Weber, H., & Schultz, L. (1997). Complex exposure histories for meteorites with “short” exposure ages. Meteoritics & Planetary Science, 32(3), 413-422. doi:10.1111/j.1945-5100.1997.tb01284.xen_AU
dc.identifier.issn1945-5100en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleMeteoritics & Planetary Scienceen_AU
dc.identifier.pagination413-422en_AU
dc.identifier.urihttps://doi.org/10.1111/j.1945-5100.1997.tb01284.xen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12160en_AU
dc.identifier.volume32en_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.subjectChondritesen_AU
dc.subjectMeteoritesen_AU
dc.subjectRadioisotopesen_AU
dc.subjectRadioactivityen_AU
dc.subjectRadiation dosesen_AU
dc.subjectStone meteoritesen_AU
dc.titleComplex exposure histories for meteorites with “short” exposure agesen_AU
dc.typeJournal Articleen_AU
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