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Correction of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis: Application to thermobarometry of spinel lherzolites

  • Xavier Llovet EMAIL logo and Gumer Galan
Published/Copyright: March 31, 2015
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American Mineralogist
From the journal American Mineralogist Volume 88 Issue 1

Abstract

A correction procedure is proposed to account for the effect of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis. The procedure is based on the Monte Carlo simulation method, which is used to calculate the X-ray spectrum emitted by the mineral couple (i.e., the mineral of interest with the neighboring mineral). The contribution of secondary fluorescence from the neighboring mineral, which appears in the simulated spectrum in a natural way, is then subtracted from the measured k-ratio and thereafter conventional matrix corrections are applied. The Monte Carlo simulation algorithm used is largely based on the general-purpose simulation package PENELOPE. In order to assess the reliability of this code, simulated “apparent” element profiles are compared with electron microprobe measurements found in the literature, in which the effect of secondary fluorescence was characterized and the reliability of the different assumptions underlying the proposed procedure is discussed.

Finally, the procedure is used to assess data from the olivine-clinopyroxene thermobarometer in a spinel lherzolite xenolith. The application of the secondary fluorescence correction leads to: (1) higher systematic pressure estimations than those obtained from uncorrected data, with lower uncertainties; and (2) a better agreement between the olivine-clinopyroxene temperature estimations and those estimated using the two-pyroxene thermometer. Estimated P-T conditions indicate a decompressional path with a slight decrease in temperature from core to crystal rim. However, if the effect of secondary fluorescence is not taken into account, an apparent heating event is observed.

Received: 2001-11-6
Accepted: 2002-7-17
Published Online: 2015-3-31
Published in Print: 2003-1-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. A molecular dynamics study of the behavior of sodium in low albite
  2. Observation and interpretation of paramagnetic defects in Brazilian and Central African carbonados
  3. Dissolution of gibbsite: Direct observations using fluid cell atomic force microscopy
  4. Polytypes and higher-order structures of antigorite: A TEM study
  5. An infrared spectroscopic study of the basic copper phosphate minerals: Cornetite, libethenite, and pseudomalachite
  6. Influence of F content on the composition of Al-rich synthetic phlogopite: Part I. New information on structure and phase-formation from 29Si, 1H, and 19F MAS NMR spectroscopies
  7. NMR evidence for formation of octahedral and tetrahedral Al and repolymerization of the Si network during dissolution of aluminosilicate glass and crystal
  8. Thermodynamic properties of hercynite (FeAl2O4) based on adiabatic calorimetry at low temperatures
  9. The formation of Sr silicates at low temperature and the solubility product of tobermorite-like Sr5Si6O16(OH)2 .5H2O
  10. Thermal equation of state of omphacite
  11. The effect of thermal decarbonation on stable isotope compositions of carbonates
  12. Synthetic MgAl2O4 (spinel) at high-pressure conditions (0.0001–30 GPa): A synchrotron X-ray powder diffraction study
  13. The stability of antigorite in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH): The effects of Al3+ substitution on high-pressure stability
  14. The fusion curve of albite revisited and the compressibility of NaAlSi3O8 liquid with pressure
  15. Correction of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis: Application to thermobarometry of spinel lherzolites
  16. An overgrowth model to explain multiple, dispersed high-Mn regions in the cores of garnet porphyroblasts
  17. Synchrotron X-ray diffraction study of the structure and dehydration behavior of todorokite
  18. Retrograde mineral reactions in saline fluid inclusions: The transformation ferropyrosmalite ↔ clinopyroxene
  19. The effect of ionizing radiation on uranophane
  20. Hydration, expansion, structure, and dynamics of layered double hydroxides
  21. Relict edenite in a garnet lherzolite from the Chinese Su-Lu UHP metamorphic terrane: Implications for metamorphic history
  22. Norrishite, K(Mn23+Li)Si4O10(O)2, an oxymica associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating
  23. The amblygonite (LiAlPO4F)-montebrasite (LiAlPO4OH) solid solution: A combined powder and single-crystal neutron diffraction and solid-state 6Li MAS, CP MAS, and REDOR NMR study
  24. An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe1–xInx)2(PO4)3 alluaudite-type solid solution
  25. Gatelite-(Ce), a new REE-bearing mineral from Trimouns, French Pyrenees: Crystal structure and polysomatic relationships with epidote and törnebohmite-(Ce)
  26. Hydroxyl in clinopyroxene from the deep subducted crust: Evidence for H2O transport into the mantle
  27. A model for the structure of the hydrated aluminum phosphate, kingite determined by ab initio powder diffraction methods
  28. The crystal structure of synthetic autunite, Ca[(UO2)(PO4)]2(H2O)11
https://doi.org/10.2138/am-2003-0115

Articles in the same Issue

  1. A molecular dynamics study of the behavior of sodium in low albite
  2. Observation and interpretation of paramagnetic defects in Brazilian and Central African carbonados
  3. Dissolution of gibbsite: Direct observations using fluid cell atomic force microscopy
  4. Polytypes and higher-order structures of antigorite: A TEM study
  5. An infrared spectroscopic study of the basic copper phosphate minerals: Cornetite, libethenite, and pseudomalachite
  6. Influence of F content on the composition of Al-rich synthetic phlogopite: Part I. New information on structure and phase-formation from 29Si, 1H, and 19F MAS NMR spectroscopies
  7. NMR evidence for formation of octahedral and tetrahedral Al and repolymerization of the Si network during dissolution of aluminosilicate glass and crystal
  8. Thermodynamic properties of hercynite (FeAl2O4) based on adiabatic calorimetry at low temperatures
  9. The formation of Sr silicates at low temperature and the solubility product of tobermorite-like Sr5Si6O16(OH)2 .5H2O
  10. Thermal equation of state of omphacite
  11. The effect of thermal decarbonation on stable isotope compositions of carbonates
  12. Synthetic MgAl2O4 (spinel) at high-pressure conditions (0.0001–30 GPa): A synchrotron X-ray powder diffraction study
  13. The stability of antigorite in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH): The effects of Al3+ substitution on high-pressure stability
  14. The fusion curve of albite revisited and the compressibility of NaAlSi3O8 liquid with pressure
  15. Correction of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis: Application to thermobarometry of spinel lherzolites
  16. An overgrowth model to explain multiple, dispersed high-Mn regions in the cores of garnet porphyroblasts
  17. Synchrotron X-ray diffraction study of the structure and dehydration behavior of todorokite
  18. Retrograde mineral reactions in saline fluid inclusions: The transformation ferropyrosmalite ↔ clinopyroxene
  19. The effect of ionizing radiation on uranophane
  20. Hydration, expansion, structure, and dynamics of layered double hydroxides
  21. Relict edenite in a garnet lherzolite from the Chinese Su-Lu UHP metamorphic terrane: Implications for metamorphic history
  22. Norrishite, K(Mn23+Li)Si4O10(O)2, an oxymica associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating
  23. The amblygonite (LiAlPO4F)-montebrasite (LiAlPO4OH) solid solution: A combined powder and single-crystal neutron diffraction and solid-state 6Li MAS, CP MAS, and REDOR NMR study
  24. An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe1–xInx)2(PO4)3 alluaudite-type solid solution
  25. Gatelite-(Ce), a new REE-bearing mineral from Trimouns, French Pyrenees: Crystal structure and polysomatic relationships with epidote and törnebohmite-(Ce)
  26. Hydroxyl in clinopyroxene from the deep subducted crust: Evidence for H2O transport into the mantle
  27. A model for the structure of the hydrated aluminum phosphate, kingite determined by ab initio powder diffraction methods
  28. The crystal structure of synthetic autunite, Ca[(UO2)(PO4)]2(H2O)11
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