Aluminum-26 in H4 chondrites: Implications for its production and its usefulness as a fine-scale chronometer for early solar system events
dc.contributor.author | Zinner, Ernst | |
dc.contributor.author | Göpel, Christa | |
dc.date.accessioned | 2021-02-12T20:55:40Z | |
dc.date.available | 2021-02-12T20:55:40Z | |
dc.date.issued | 2002-01-01 | |
dc.identifier.citation | Zinner, E., & Göpel, C. (2002). Aluminum‐26 in H4 chondrites: Implications for its production and its usefulness as a fine‐scale chronometer for early solar system events. Meteoritics & Planetary Science, 37(7), 1001-1013. | |
dc.identifier.issn | 1945-5100 | |
dc.identifier.doi | 10.1111/j.1945-5100.2002.tb00872.x | |
dc.identifier.uri | http://hdl.handle.net/10150/655545 | |
dc.description.abstract | In order to investigate whether or not 26Al can be used as a fine-scale chronometer for early-solar-system events we measured, with an ion microprobe, Mg isotopes and Al/Mg ratios in separated plagioclase, olivine, and pyroxene crystals from the H4 chondrites Ste. Marguerite, Forest Vale, Beaver Creek and Quenggouk and compared the results with the canonical 26Al/27Al ratio for Ca,Al-rich inclusions (CAIs). For Ste. Marguerite (SM) and Forest Vale (FV) Pb/Pb and Mn-Cr ages have previously been determined (Gpel et al., 1994; Polnau et al., 2000; Polnau and Lugmair, 2001). Plagioclase grains from these two meteorites show clear excesses of 26Mg. The 26Al/27Al ratios inferred from these excesses and from isotopically normal Mg in pyroxene and olivine are (2.87 +/- 0.64) x 10^(-7) for SM and (1.52 +/- 0.52) x 10^(-7) for FV. The differences between these ratios and the ratio of 5 x 10^(-5) in CAIs indicate time differences of 5.4 +/- 0.1 Ma and 6.1 +/- 0.2 Ma for SM and FV, respectively. These differences are in agreement with the absolute Pb/Pb ages for CAIs and SM and FV phosphates but there are large discrepancies between the U-Pb and Mn-Cr system for the relative ages for CAIs, SM and FV. For example, Mn-Cr ages of carbonates from Kaidun are older than the Pb/Pb age of CAIs. However, even if we require that CAIs are older than these carbonates, the time difference between this "adjusted" CAI age and the Mn-Cr ages of SM and FV require that 26Al was widely distributed in the early solar system at the time of CAI formation and was not mostly present in CAIs, a feature of the X-wind model proposed by Shu and collaborators (Gounelle et al., 2001; Shu et al., 2001). From this we conclude that there was enough 26Al to melt small planetary bodies as long as they formed within 2 Ma of CAIs, and that 26Al can serve as a fine-scale chronometer for early solar system events. | |
dc.language.iso | en | |
dc.publisher | The Meteoritical Society | |
dc.relation.url | https://meteoritical.org/ | |
dc.rights | Copyright © The Meteoritical Society | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | H4 chondrites | |
dc.subject | Mg isotopes | |
dc.subject | Al/Mg ratios | |
dc.subject | plagioclase | |
dc.subject | olivine | |
dc.subject | pyroxenes | |
dc.title | Aluminum-26 in H4 chondrites: Implications for its production and its usefulness as a fine-scale chronometer for early solar system events | |
dc.type | Article | |
dc.type | text | |
dc.identifier.journal | Meteoritics & Planetary Science | |
dc.description.collectioninformation | The Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. | |
dc.eprint.version | Final published version | |
dc.description.admin-note | Migrated from OJS platform February 2021 | |
dc.source.volume | 37 | |
dc.source.issue | 7 | |
dc.source.beginpage | 1001 | |
dc.source.endpage | 1013 | |
refterms.dateFOA | 2021-02-12T20:55:40Z |