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Electron Microprobe/SIMS Determinations of Al in Olivine: Applications to Solar Wind, Pallasites and Trace Element Measurements

Paque, Julie M. and Hofmann, Amy E. and Burnett, Donald S. and Guan, Yunbin and Jurewicz, Amy J. G. and Woolum, Dorothy S. and Ma, Chi and Rossman, George R. (2020) Electron Microprobe/SIMS Determinations of Al in Olivine: Applications to Solar Wind, Pallasites and Trace Element Measurements. Geostandards and Geoanalytical Research, 44 (3). pp. 473-484. ISSN 1639-4488. https://resolver.caltech.edu/CaltechAUTHORS:20200608-133209595

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Abstract

Electron probe microanalyser measurements of trace elements with high accuracy are challenging. Accurate Al measurements in olivine are required to calibrate SIMS implant reference materials for measurement of Al in the solar wind. We adopt a combined EPMA/SIMS approach that is useful for producing SIMS reference materials as well as for EPMA at the ~100 µg g⁻¹ level. Even for mounts not polished with alumina photoelectron spectroscopy shows high levels of Al surface contamination. In order to minimise electron beam current density, a rastered 50 × 100 µm electron beam was adequate and minimised sensitivity to small Al‐rich contaminants. Reproducible analyses of eleven SIMS cleaned spots on San Carlos olivine agreed at 69.3 ± 1.0 µg g⁻¹. The known Al mass fraction was used to calibrate an Al implant into San Carlos. Accurate measurements of Al were made for olivines in the pallasites: Imilac, Eagle Station and Springwater. Our focus was on Al in olivine; but our technique could be refined to give accurate electron probe measurements for other contamination‐sensitive trace elements. For solar wind it is projected that the Al/Mg abundance ratio can be determined to 6%, a factor of 2 more precise than the solar spectroscopic ratio.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1111/ggr.12347DOIArticle
ORCID:
AuthorORCID
Paque, Julie M.0000-0003-0554-7876
Burnett, Donald S.0000-0001-9521-8675
Guan, Yunbin0000-0002-7636-3735
Jurewicz, Amy J. G.0000-0002-3282-5782
Ma, Chi0000-0002-1828-7033
Rossman, George R.0000-0002-4571-6884
Additional Information:© 2020 The Authors. Geostandards and Geoanalytical Research © 2020 International Association of Geoanalysts. Issue Online: 12 August 2020; Version of Record online: 21 July 2020; Accepted manuscript online: 08 June 2020; Manuscript accepted: 26 May 2020; Manuscript received: 05 December 2019. Funding: National Aeronautics and Space Administration. Grant Number: 89NSSC17K0025.
Funders:
Funding AgencyGrant Number
NASA89NSSC17K0025
Subject Keywords:olivine; aluminium; Genesis; electron probe microanalysis; SIMS
Issue or Number:3
Record Number:CaltechAUTHORS:20200608-133209595
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200608-133209595
Official Citation:Paque, J.M., Hofmann, A.E., Burnett, D.S., Guan, Y., Jurewicz, A.J., Woolum, D.S., Ma, C. and Rossman, G.R. (2020), Electron Microprobe/SIMS Determinations of Al in Olivine: Applications to Solar Wind, Pallasites and Trace Element Measurements. Geostand Geoanal Res, 44: 473-484. doi:10.1111/ggr.12347
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103775
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jun 2020 20:47
Last Modified:13 Aug 2020 16:55

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