Oxygen isotope analysis of olivine by ion microprobe: Matrix effects and applications to a serpentinised dunite

Scicchitano, Maria Rosa; Rubatto, Daniela; Hermann, Jörg; Majumdar, Alik S.; Putnis, Andrew

doi:10.1016/j.chemgeo.2018.09.020

Cited by 21 publications

(11 citation statements)

References 59 publications

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“…Isa et al () confirmed no significant matrix effect in olivine with Mg‐numbers > 75. Using a SHRIMP SIMS instrument, Scicchitano et al () suggested that the matrix effect was only negligible for olivine with Mg‐numbers ranging from 88 to 92 and might become significant outside this range. Our results are consistent with the conclusion of Isa et al () for olivine with Mg‐numbers of 89.6–94.2.…”

Section: Discussionmentioning

confidence: 99%

“…Isa et al () investigated the sputter rates for olivine grains with different Fa (fayalite) contents and presented an empirical calibration curve based on Fa values and corresponding matrix bias. More recently, Scicchitano et al () investigated the matrix bias in olivine with SHRIMP SIMS instruments and found quadratic function relation between the matrix bias and Fa content. Compared with olivine, oxygen isotopes of pyroxene grains are more sensitive to mantle metasomatism and magma differentiation, since the oxygen self‐diffusion rate in pyroxene is faster than that in olivine (Ito et al , Farver , Gérard and Jaoul , Ryerson et al ).…”

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confidence: 99%

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High‐Mg# Olivine, Clinopyroxene and Orthopyroxene Reference Materials for In Situ Oxygen Isotope Determination

Tang

et al. 2019

Geostandard Geoanalytic Res

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Secondary ion mass spectrometry (SIMS) requires matrix‐matched reference materials to calibrate mass fractionation during oxygen isotope measurement. Over one thousand SIMS oxygen isotope measurements were conducted on eleven natural mineral samples (five olivines, three clinopyroxenes and three orthopyroxenes) in nineteen sessions using CAMECA IMS 1280 SIMS instruments to evaluate their potential as SIMS reference materials. The obtained results reveal oxygen isotope homogeneity of these samples. No matrix effect was measured for the same variety of mineral samples with limited Mg‐number variations (89.6–94.2, 90–91.9 and 90.1–92.1 for olivine, clinopyroxene and orthopyroxene, respectively). The recommended oxygen isotope compositions of these samples were determined using laser fluorination. These samples are therefore suitable to be used as reference materials for in situ oxygen isotope microanalysis.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

High‐Mg# Olivine, Clinopyroxene and Orthopyroxene Reference Materials for In Situ Oxygen Isotope Determination

Tang

et al. 2019

Geostandard Geoanalytic Res

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“…UWQ‐1 quartz, UWC‐3 calcite and SCO‐ANU olivine (Scicchitano et al . 2018b) were used as running reference materials in sessions S1 to S5 and S7, which aimed to test the isotopic homogeneity of the prospective serpentine reference materials or potential grain orientation effects in serpentine.…”

Section: Data Treatmentmentioning

confidence: 99%

“…2017, Scicchitano et al . 2018b), plagioclase (Valley and Kita 2009), alkali feldspar (Pollington 2013), ortho‐ and clinopyroxenes (Valley and Kita 2009, Kita et al . 2010, Tenner et al .…”

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In Situ Oxygen Isotope Determination in Serpentine Minerals by SIMS: Addressing Matrix Effects and Providing New Insights on Serpentinisation at Hole BA1B (Samail ophiolite, Oman)

Scicchitano

Spicuzza

Ellison

et al. 2020

Geostandard Geoanalytic Res

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The ability to constrain the petrogenesis of multiple serpentine generations recorded at the microscale is crucial for estimating the extent and conditions of modern versus fossil serpentinisation in ophiolites. To address matrix bias effects during oxygen isotope analysis by SIMS, we present the first investigation analysing antigorite in the compositional range Mg# = 77.5–99.5 mole %, using a CAMECA IMS‐1280 secondary ion mass spectrometer. Spot‐to‐spot homogeneity is ≤ 0.5‰ (2s) for the new antigorite reference materials. The relative bias between antigorite reference materials with different Mg/Fe ratios is described by a second‐order polynomial, and a maximum difference in bias of ~ 1.8‰ was measured for Mg# ~ 78 to 100. We observed a bias up to ~ 1.0‰ between lizardite and antigorite attributed to their different crystal structures. Orientation effects up to ~ 1‰ were observed in chrysotile. The new analytical protocol allowed the identification of oxygen isotope zoning up to ~ 7‰ in serpentine minerals from two serpentinites recovered from an area of active serpentinisation in the Samail ophiolite. Thus, in situ analysis is capable of resolving isotopic heterogeneity that may directly reflect changes in the physical and chemical conditions of multiple serpentinisation events in the Samail ophiolite.

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Triple‐oxygen isotopes of stony micrometeorites by secondary ion mass spectrometry (SIMS): Olivine, basaltic glass and iron oxide matrix effects for sensitive high‐mass resolution ion microprobe‐stable isotope (SHRIMP‐SI)

McKibbin,

Ávila,

Ireland

et al. 2024

Rapid Comm Mass Spectrometry

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RationaleMicrometeorites are extraterrestrial particles smaller than ~2 mm in diameter, most of which melted during atmospheric entry and crystallised or quenched to form ‘cosmic spherules’. Their parentage among meteorite groups can be inferred from triple‐oxygen isotope compositions, for example, by secondary ion mass spectrometry (SIMS). This method uses sample efficiently, preserving spherules for other investigations. While SIMS precisions are improving steadily, application requires assumptions about instrumental mass fractionation, which is controlled by sample chemistry and mineralogy (matrix effects).MethodsWe have developed a generic SIMS method using sensitive high‐mass resolution ion micro probe‐stable isotope (SHRIMP‐SI) that can be applied to finely crystalline igneous textures as in cosmic spherules. We correct for oxygen isotope matrix effects using the bulk chemistry of samples obtained by laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) and model bulk chemical compositions as three‐component mixtures of olivine, basaltic glass and Fe‐oxide (magnetite), finding a unique matrix correction for each target.ResultsOur first results for cosmic spherules from East Antarctica compare favourably with established micrometeorite groups defined by precise and accurate but consumptive bulk oxygen isotope methods. The Fe‐oxide content of each spherule is the main control on magnitude of oxygen isotope ratio bias, with effects on δ18O up to ~6‰. Our main peak in compositions closely coincides with so‐called ‘Group 1’ objects identified by consumptive methods.ConclusionsThe magnitude of SIMS matrix effects we find is similar to the previous intraspherule variations, which are now the limiting factor in understanding their compositions. The matrix effect for each spherule should be assessed quantitatively and individually, especially addressing Fe‐oxide content. We expect micrometeorite triple‐oxygen isotope compositions obtained by SIMS to converge on the main clusters (Groups 1 to 4) after correction firstly for magnetite content and secondarily for other phases (e.g., basaltic glass) in each target.

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Oxygen isotope analysis of olivine by ion microprobe: Matrix effects and applications to a serpentinised dunite

Cited by 21 publications

References 59 publications

High‐Mg# Olivine, Clinopyroxene and Orthopyroxene Reference Materials for In Situ Oxygen Isotope Determination

High‐Mg# Olivine, Clinopyroxene and Orthopyroxene Reference Materials for In Situ Oxygen Isotope Determination

In Situ Oxygen Isotope Determination in Serpentine Minerals by SIMS: Addressing Matrix Effects and Providing New Insights on Serpentinisation at Hole BA1B (Samail ophiolite, Oman)

Triple‐oxygen isotopes of stony micrometeorites by secondary ion mass spectrometry (SIMS): Olivine, basaltic glass and iron oxide matrix effects for sensitive high‐mass resolution ion microprobe‐stable isotope (SHRIMP‐SI)

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