Electron Microprobe/SIMS Determinations of Al in Olivine: 

Applictions to Solar Wind, Pallasites, and Trace Element Measurements




J M Paque1, AE Hofmann1, DS Burnett1,  Y Guan1, AJG Jurewicz2, DS Woolum3, C Ma1, GR Rossman1
 
  1 Division of Geological and Planetary Sciences
California Institute of Technology
Pasadena, CA  91125-2500


2
SESE
Arizona State University
Tempe, AZ 85287


Department of Physics
California State University, Fullerton
Fullerton, CA 92834



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 g 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 m 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 g 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.