MG ISOTOPE HETEROGENEITY IN THE ALLENDE METEORITE MEASURED BY UV LASER ABLATION-MC-ICPMS AND COMPARISONS WITH O ISOTOPES
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dc.contributor.author | Young E.D. | |
dc.contributor.author | Ash R.D. | |
dc.contributor.author | Galy A. | |
dc.contributor.author | Belshaw N.S. | |
dc.date.accessioned | 2021-04-14T06:52:06Z | |
dc.date.available | 2021-04-14T06:52:06Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=908274 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 4, 683-698 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27796 | |
dc.description.abstract | First results from a new UV laser ablation MC-ICPMS method for measuring Mg isotope ratios in situ in meteoritical materials show that there are mass-dependent variations in δ25Mg and δ26Mg up to 1.5 %% per amu in chondrules and 0.3%% per amu in a CAI from the Allende meteorite. In both cases the mass-dependent fractionation is associated with alteration. Comparisons with laser ablation O isotope data indicate that incorporation of pre-existing grains of forsterite with distinct Mg and O isotopic compositions and post-formation alteration both contributed to the variability in Mg isotope ratios in the chondrules, resulting in a correlation between high δ25Mg and low Δ17O. The laser ablation analyses of the CAI show that high-precision determinations of both δ25Mg and δ26Mg can be used to discriminate features of the 26Al-26Mg isotope system that are relevant to chronology from those that result from element mobility. | |
dc.title | MG ISOTOPE HETEROGENEITY IN THE ALLENDE METEORITE MEASURED BY UV LASER ABLATION-MC-ICPMS AND COMPARISONS WITH O ISOTOPES | |
dc.type | Статья |
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