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Experimental investigation of F and Cl partitioning between apatite and Fe-rich basaltic melt at 0 GPa and 950–1050 °C: Evidence for steric controls on apatite-melt exchange equilibria in OH-poor apatite

  • Francis M. McCubbin EMAIL logo and Gokce Ustunisik
Published/Copyright: August 28, 2018
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American Mineralogist
From the journal American Mineralogist Volume 103 Issue 9

Abstract

Apatite-melt partitioning experiments were conducted in a Deltech vertical-quench 1-bar furnace at 0 GPa and 950–1050 °C using an Fe-rich basaltic starting composition. Each experiment had a unique F:Cl ratio to assess the partitioning of F and Cl between apatite and melt, and the oxygen fugacity of all experiments was between IW and IW-1. Apatite-melt partitioning of F and Cl along the F-Cl binary join is investigated in particular to assess the effect of non-ideal mixing of apatite X-site components. The quenched melt and apatite from each experiment were analyzed by electron probe microanalysis. Several of our experiments exhibited evidence of silicate liquid immiscibility (SLI), so we also evaluated the effect of SLI on the partitioning of F and Cl between apatite and melt in those experiments. The F-Cl exchange equilibria between apatite and melt were variable with KDCl−FAp−melt values in the range of 0.08–0.21 across the F-Cl join. The KDCl−FAp−melt values decreased with decreasing F in apatite and melt. Notably, we did not observe evidence that SLI has a first-order effect on the behavior of F and Cl partitioning between apatite and melt. The observed drop in KDCl−FAp−melt values with decreasing F abundance in melt and apatite indicate that F becomes more compatible in apatite than Cl as there is less F in the system under nominally anhydrous conditions. This behavior can be explained by the presence of an off-mirror F site in F-Cl apatite that only F can occupy, and this F site is required to stabilize the apatite structure in OH-poor systems. These results demonstrate a link between atomic arrangements of apatite X-site components, the thermodynamic mixing properties of apatite X-site components, and the values of apatite-melt exchange equilibria for apatite X-site components. These results also indicate that Cl-rich apatites [i.e., Cl > 0.1 structural formula units (sfu) of apatite X-site] with compositions near the F-Cl binary join (i.e., <0.12 sfu from the F-Cl binary join), even if formed from H2O-bearing natural systems, should not be used for apatite-based melt-hygrometry.

Keywords: Hygrometry; Moon; Mars; water; phosphate; silicate liquid immiscibility; merrillite; electron microprobe

Acknowledgments

The authors are grateful for discussions with Kathleen Vander Kaaden, Jessica Barnes, and Jeremy Boyce during the preparation of this manuscript. We are also thankful to David Walker for his intellectual input and for providing laboratory facilities required for the experiments to be completed successfully. F.M. and G.U. acknowledge support from the NASA Cosmochemistry Program through a grant awarded to F.M. and a grant awarded to Denton Ebel (NNX10AI42G), respectively. G.U. also acknowledges support from an AMNH Katherine Davis postdoctoral fellowship during this study. The authors thank Bradley Jolliff and Philip Piccoli for detailed and thoughtful reviews that greatly helped to improve the quality and clarity of the manuscript. The authors are also grateful to Daniel Harlov for the editorial handling of this manuscript.

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Received: 2017-10-18
Accepted: 2018-05-11
Published Online: 2018-08-28
Published in Print: 2018-09-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. The tales of disequilibrium and equilibrium crystallization of rare metal minerals: Data from new experiments
  3. Pressure, temperature, water content, and oxygen fugacity dependence of the Mg grain-boundary diffusion coefficient in forsterite
  4. Questioning the biogenicity of Neoproterozoic superheavy pyrite by SIMS
  5. The effect of disequilibrium crystallization on Nb-Ta fractionation in pegmatites: Constraints from crystallization experiments of tantalite-tapiolite
  6. Titanite major and trace element compositions as petrogenetic and metallogenic indicators of Mo ore deposits: Examples from four granite plutons in the southern Yidun arc, SW China
  7. Kuliginite, a new hydroxychloride mineral from the Udachnaya kimberlite pipe, Yakutia: Implications for low-temperature hydrothermal alteration of the kimberlites
  8. Electron microprobe technique for the determination of iron oxidation state in silicate glasses
  9. Experimental investigation of F and Cl partitioning between apatite and Fe-rich basaltic melt at 0 GPa and 950–1050 °C: Evidence for steric controls on apatite-melt exchange equilibria in OH-poor apatite
  10. Carbonic acid monohydrate
  11. High spatial resolution analysis of the iron oxidation state in silicate glasses using the electron probe
  12. Disturbance of the Sm-Nd isotopic system by metasomatic alteration: A case study of fluorapatite from the Sin Quyen Cu-LREE-Au deposit, Vietnam
  13. Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile
  14. Vestaite, (Ti4+Fe2+) Ti34+ O9, a new mineral in the shocked eucrite Northwest Africa 8003
  15. Decomposition boundary from high-pressure clinoenstatite to wadsleyite + stishovite in MgSiO3
  16. Letter
  17. Making tissintite: Mimicking meteorites in the multi-anvil
  18. Book Review
https://doi.org/10.2138/am-2018-6339
Keywords for this article
Hygrometry; Moon; Mars; water; phosphate; silicate liquid immiscibility; merrillite; electron microprobe

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. The tales of disequilibrium and equilibrium crystallization of rare metal minerals: Data from new experiments
  3. Pressure, temperature, water content, and oxygen fugacity dependence of the Mg grain-boundary diffusion coefficient in forsterite
  4. Questioning the biogenicity of Neoproterozoic superheavy pyrite by SIMS
  5. The effect of disequilibrium crystallization on Nb-Ta fractionation in pegmatites: Constraints from crystallization experiments of tantalite-tapiolite
  6. Titanite major and trace element compositions as petrogenetic and metallogenic indicators of Mo ore deposits: Examples from four granite plutons in the southern Yidun arc, SW China
  7. Kuliginite, a new hydroxychloride mineral from the Udachnaya kimberlite pipe, Yakutia: Implications for low-temperature hydrothermal alteration of the kimberlites
  8. Electron microprobe technique for the determination of iron oxidation state in silicate glasses
  9. Experimental investigation of F and Cl partitioning between apatite and Fe-rich basaltic melt at 0 GPa and 950–1050 °C: Evidence for steric controls on apatite-melt exchange equilibria in OH-poor apatite
  10. Carbonic acid monohydrate
  11. High spatial resolution analysis of the iron oxidation state in silicate glasses using the electron probe
  12. Disturbance of the Sm-Nd isotopic system by metasomatic alteration: A case study of fluorapatite from the Sin Quyen Cu-LREE-Au deposit, Vietnam
  13. Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile
  14. Vestaite, (Ti4+Fe2+) Ti34+ O9, a new mineral in the shocked eucrite Northwest Africa 8003
  15. Decomposition boundary from high-pressure clinoenstatite to wadsleyite + stishovite in MgSiO3
  16. Letter
  17. Making tissintite: Mimicking meteorites in the multi-anvil
  18. Book Review
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