SIMS analyses of oxygen isotopes: Matrix effects in Fe–Mg–Ca garnets

Vielzeuf, Daniel; Champenois, Michel; Valley, John W.; Brunet, Fabrice; Devidal, Jean‐Luc

doi:10.1016/j.chemgeo.2005.07.008

Cited by 61 publications

(83 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[64][65][66][67][68][69][70][71] Lyon et al 72 observed an effect of the crystallographic orientation of a sample relative to the secondary ion beam focused on the sample on isotope fractionation. This effect was shown to be significant for magnetite and hematite but not for other samples such as quartz or olivine.…”

Section: Instrumental Isotopic Fractionation In Simsmentioning

confidence: 98%

Instrumental Isotopic Fractionation

Irrgeher

Prohaska

2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

View full text Add to dashboard Cite

In mass spectrometry, the term ‘instrumental isotopic fractionation’ is recommended to describe the sum of the effects in a mass spectrometer occurring during sample introduction, ion formation, ion extraction, ion separation and ion detection leading to a difference of the measured isotope ratio from the true isotope ratio in a sample. Instrumental isotopic fractionation (IIF) describes the instrumental fractionation between nuclides of the same element resulting in erroneous results of isotope ratios. The major aspects of IIF for the different techniques (i.e. (LA)-ICP-MS, GDMS, TIMS, SIMS and IRMS) based on magnetic sector field analysers are presented. A special focus is set on the description of the major causes of IIF, the areas of occurrence in the respective instrumentations as well as the impact of IIF on the final measurement result and the related measurement uncertainty. The described techniques differ strongly in the extent of IIF, mainly due to the different ionization sources as well as vacuum conditions.

show abstract

Section: Instrumental Isotopic Fractionation In Simsmentioning

confidence: 98%

Instrumental Isotopic Fractionation

Irrgeher

Prohaska

2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

View full text Add to dashboard Cite

show abstract

“…Each majorite sample was analysed twice, and in each case the two spots were identical within uncertainty. A major obstacle to accurate SIMS analysis is the dependence of the instrumental mass fractionation on the chemical composition and structure of the target material, the so called "matrix effect" (Russell et al, 1980;Eiler et al, 1997;Vielzeuf et al, 2005;Page et al, 2010). We employ the technique described by Page et al (2010) to correct for the bias between the primary reference material and the majorite samples based on Ca-content.…”

Section: We Made High-precision Sims δmentioning

confidence: 99%

Extreme 18O-enrichment in majorite constrains a crustal origin of transition zone diamonds

Ickert¹,

Stachel²,

Stern³

et al. 2015

Geochem. Persp. Let.

View full text Add to dashboard Cite

“…The variable effect of mineral composition on instrumental mass fractionation (IMF) presents a major difficulty in accurate ion microprobe analysis of minerals with complex solid solutions such as garnet (e.g. Hervig et al , 1992; Eiler et al , 1997; Vielzeuf et al , 2005a). Vielzeuf et al (2005a) noted that in a large‐radius, multi‐collecting ion microprobe, the grossular content of garnet appears to exert the greatest effect on the IMF in garnet analyses, and speculated that the molar volume of garnet might be correlated with IMF.…”

Section: Methodsmentioning

confidence: 99%

“…Hervig et al , 1992; Eiler et al , 1997; Vielzeuf et al , 2005a). Vielzeuf et al (2005a) noted that in a large‐radius, multi‐collecting ion microprobe, the grossular content of garnet appears to exert the greatest effect on the IMF in garnet analyses, and speculated that the molar volume of garnet might be correlated with IMF. Vielzeuf et al (2005a) developed a correction scheme that is based on a least‐square calculation of IMFs from a set of standards that bracket the cation composition (specifically Ca, Fe 2+ and Mg) of the unknown garnet.…”

Section: Methodsmentioning

confidence: 99%

Genesis of metapelitic migmatites in the Adirondack Mountains, New York

Lancaster

Page

et al. 2008

Journal Metamorphic Geology

View full text Add to dashboard Cite

Oxygen isotope ratios and rare earth element (REE) concentrations provide independent tests of competing models of injection v. anatexis for the origin of migmatites from amphibolite and granulite facies metasedimentary rocks of the Adirondack Mountains, New York. Values of d 18O and REE profiles were measured by ion microprobe in garnet-zircon pairs from 10 sample localities. Prior U-Pb SIMS dating of zircon grains indicates that inherited cores (1.7-1.2 Ga) are surrounded by overgrowths crystallized during the Grenville orogenic cycle ($1.2-1.0 Ga). Cathodoluminescence imaging records three populations of zircon: (i) featureless rounded Ôwhole grainsÕ (interpreted as metamorphic or anatectic), and rhythmically zoned (igneous) cores truncated by rims that are either (ii) discordant rhythmically zoned (igneous) or (iii) unzoned (metamorphic or anatectic). These textural interpretations are supported by geochronology and oxygen isotope analysis. In both the amphibolite facies NW Adirondacks and the granulite facies SE Adirondacks, d18 O (Zrc) values in overgrowths and whole zircon are highly variable for metamorphic zircon (6.1-13.4&; n = 95, 10 lm spot). In contrast, garnet is typically unzoned and d 18O (Grt) values are constant at each locality, differing only between leucosomes and corresponding melanosomes. None of the analysed metamorphic zircon-garnet pairs attained oxygen isotope equilibrium, indicating that zircon rims and garnet are not coeval. Furthermore, REE profiles from zircon rims indicate zircon growth in all regions was prior to significant garnet growth. Thus, petrological estimates from garnet equilibria (e.g. P-T) cannot be associated uncritically with ages determined from zircon. The unusually high d

show abstract

SIMS analyses of oxygen isotopes: Matrix effects in Fe–Mg–Ca garnets

Cited by 61 publications

References 25 publications

Instrumental Isotopic Fractionation

Instrumental Isotopic Fractionation

Extreme 18O-enrichment in majorite constrains a crustal origin of transition zone diamonds

Genesis of metapelitic migmatites in the Adirondack Mountains, New York

Contact Info

Product

Resources

About