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- W1632572475 abstract "Introduction: Magnesium has three isotopes (24, 25 & 26), one of which can be produced by the shortlived decay of Al (t1/2 = 0.73 Myr). Since the demonstration of the former presence of Al in calcium-aluminium-rich inclusions (CAIs) [1], the Al-to-Mg chronometer has been used to date the relative timing of CAIs and chondrules as well as the formation of some basaltic meteorites [e.g., 2,3]. Recent application of multiple-collector inductively coupled plasma mass spectrometry (MC-ICPMS) to Mg isotope analysis has potentially opened up a new range of dating opportunities. In particular, small excesses or deficits in meteorites and their constituents should now be resolvable that might allow isochron or model age dating of material that was previously impossible to date. For example, the presence of small Mg excesses in bulk basaltic meteorites might be used to date the increase in Al/Mg ratio associated with the formation of basaltic magmas. Conversely, Al/Mg ratios of essentially zero in some types of differentiated meteorites and their minerals should allow Mg deficits to place age constraints on their formation if this took place within 2 million years of CAI formation. The δMg* excesses and deficits expected from such processes will be ca. < ±0.050‰ and require both the precision and accuracy of Mg isotope measurements to be ca. ±0.005‰ if the full potential of the Al-to-Mg dating system is to be utilised. Here, we describe analytical developments intended to assess whether MC-ICPMS techniques can really produce Mg isotope data at these levels of precision and accuracy." @default.
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- W1632572475 date "2007-01-01" @default.
- W1632572475 modified "2023-09-23" @default.
- W1632572475 title "DEVELOPMENT OF PRECISE AND ACCURATE MAGNESIUM ISOTOPE MEASUREMENTS BY MULTIPLE-COLLECTOR INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY" @default.
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