UV laser ablation and irm-GCMS microanalysis of 18O/16O and 17O/16O with application to a calcium-aluminium-rich inclusion from the Allende meteorite

Edward D. Young, David W. Coutts, Daniel Kapitan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Analyses of 18O/16O and 17O/16O in silicate and oxide minerals by UV laser ablation of 100 X 80 X 50 μm sample pits combined with irm-GCMS yield precision and accuracy similar to that of conventional methods. This represents a 100-fold reduction in minimum size relative to other fluorination methods based on gas-source mass spectrometry and enables high-precision in-situ intracrystalline analysis of silicate minerals. Analyses of almandine, forsterite, and schorl of known isotopic compositions indicate an analytical precision of ±0.3‰ (1σ) in δ18O and ±0.4 in δ17O with an accuracy of similar magnitude. Application to meteoritic samples is demonstrated by in-situ analysis of pyroxene and melilite from a type B CAI inclusion from the Allende meteorite. The CAI data adhere to the carbonaceous chondrite anhydrous mineral line defined by conventional macroscopic fluorination methods and demonstrate that non-mass dependent differences of 1‰ amu-1 are discernible. The unique combination of analytical and spatial resolution afforded by the new UV laser microprobe will allow high-precision mapping of the distribution of anomalous oxygen in minerals from calcium-aluminum-rich inclusions on a previously unattainable scale.

LanguageEnglish
Pages3161-3168
Number of pages8
JournalGeochimica et Cosmochimica Acta
Volume62
Issue number18
DOIs
Publication statusPublished - Sep 1998
Externally publishedYes

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Allende meteorite
Silicate minerals
Computer aided instruction
Meteorites
Fluorination
Laser ablation
Aluminum
ablation
Minerals
aluminum
laser
calcium
Oxide minerals
Calcium
Mass spectrometry
mineral
Gases
Oxygen
melilite
almandine

Cite this

@article{40f935dd35544a3fa32d6b8d5d64bf8c,
title = "UV laser ablation and irm-GCMS microanalysis of 18O/16O and 17O/16O with application to a calcium-aluminium-rich inclusion from the Allende meteorite",
abstract = "Analyses of 18O/16O and 17O/16O in silicate and oxide minerals by UV laser ablation of 100 X 80 X 50 μm sample pits combined with irm-GCMS yield precision and accuracy similar to that of conventional methods. This represents a 100-fold reduction in minimum size relative to other fluorination methods based on gas-source mass spectrometry and enables high-precision in-situ intracrystalline analysis of silicate minerals. Analyses of almandine, forsterite, and schorl of known isotopic compositions indicate an analytical precision of ±0.3‰ (1σ) in δ18O and ±0.4 in δ17O with an accuracy of similar magnitude. Application to meteoritic samples is demonstrated by in-situ analysis of pyroxene and melilite from a type B CAI inclusion from the Allende meteorite. The CAI data adhere to the carbonaceous chondrite anhydrous mineral line defined by conventional macroscopic fluorination methods and demonstrate that non-mass dependent differences of 1‰ amu-1 are discernible. The unique combination of analytical and spatial resolution afforded by the new UV laser microprobe will allow high-precision mapping of the distribution of anomalous oxygen in minerals from calcium-aluminum-rich inclusions on a previously unattainable scale.",
author = "Young, {Edward D.} and Coutts, {David W.} and Daniel Kapitan",
year = "1998",
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UV laser ablation and irm-GCMS microanalysis of 18O/16O and 17O/16O with application to a calcium-aluminium-rich inclusion from the Allende meteorite. / Young, Edward D.; Coutts, David W.; Kapitan, Daniel.

In: Geochimica et Cosmochimica Acta, Vol. 62, No. 18, 09.1998, p. 3161-3168.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Kapitan, Daniel

PY - 1998/9

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