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Effect of chlorine substitution on the thermal stability of ferro-pargasite and thermochemical properties of ferro-chloro-hornblende

  • David M. Jenkins EMAIL logo
Published/Copyright: May 31, 2024
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American Mineralogist
From the journal American Mineralogist Volume 109 Issue 6

Abstract

Substitution of chlorine for hydroxyls in calcium amphiboles has been widely documented, but the effect of this substitution on thermal stability is not known. Experimental reversal data are presented here comparing the upper-thermal stability of amphiboles formed in the ferro-pargasite and ferro-chloro-pargasite bulk compositions. Experiments were made over the range of 550–900 °C and 0.5–3 kbar at oxygen fugacities of log(fO2) of –0.3 to +0.5 relative to Co-CoO. Electron microprobe analysis of amphiboles made from the ferro-pargasite bulk composition were found to be ferro-pargasite, while those made from the ferro-chloro-pargasite bulk composition were low in A-site Na and Cl and were better classified as Cl-bearing ferro-ferri-hornblende. Although the differences between desired and observed amphibole compositions complicate the comparison of their thermal stabilities, it can be deduced that the Cl-bearing amphibole has a steeper dP/dT slope and, above 1 kbar, a lower thermal stability than ferro-pargasite. Thermodynamic analysis of the Cl-bearing amphibole was also done to extract thermochemical data for the Cl end-member amphibole ferro-chloro-hornblende [Ca2(Fe4Al) (AlSi7)O22Cl2 = Fe-Cl-Horn] that are consistent with the thermodynamic database of Holland and Powell (2011). Using an ideal-activity expression and estimated values for the heat capacity (CP = 1.106 + 8.9156 × 10−5(T, K) – 11218.3/T2 − 5.9548/T0.5; kJ/K·mol) and volume (283.0 ± 1.5 cm3/mol) for Fe-Cl-Hom, the derived values for (ΔHfo) and S ° are −10 842.6 ± 10.3 kJ/mol and 618.8 ± 11.1 .J/K·mol. respectively. The implication of this work is that (1) chlorine appears to lower the thermal stability of a given calcium amphibole in contrast to the marked increase in thermal stabilities caused by fluorine, and (2) thermochemical data such as those derived in this study allow absolute concentrations of chloride salts to be calculated in metasomatic paleobrines, as illustrated for the Bamble sector of southern Norway reported in the literature.

Keywords: Mineral stability; ferro-pargasite; ferro-chloro-hornblende; chlorine amphibole; thermochemistry; metasomatic paleobrines; mineral synthesis

Acknowledgments and Funding

Thanks are given to David Collins for assisting with the electron microprobe analyses and to Vincent Van Nostrand for assisting with the FTIR analyses. Thanks are given to Mark Kendrick and an anonymous reviewer for their very helpful comments. Financial support for this study comes from NSF grant EAR-1725053 to D.M.J., for which the author is grateful.

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Received: 2023-02-23
Accepted: 2023-07-27
Published Online: 2024-05-31
Published in Print: 2024-06-25

© 2024 by Mineralogical Society of America

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https://doi.org/10.2138/am-2023-8981
Keywords for this article
Mineral stability; ferro-pargasite; ferro-chloro-hornblende; chlorine amphibole; thermochemistry; metasomatic paleobrines; mineral synthesis

Articles in the same Issue

  1. Perspectives
  2. Concerning tetrahedrites: How much to lump and how far to split?
  3. The space-time architecture variation of the shallow magmatic plumbing systems feeding the Campi Flegrei and Ischia volcanoes (Southern Italy) from halogen constraints
  4. Effect of chlorine substitution on the thermal stability of ferro-pargasite and thermochemical properties of ferro-chloro-hornblende
  5. Ilmenite phase transformations in suevite from the Ries impact structure (Germany) record evolution in pressure, temperature, and oxygen fugacity conditions
  6. The 34S/32S homogeneity of Chemical Vapor Transport (CVT) Reaction-synthesized pyrites
  7. Hydrogen incorporation mechanism in the lower-mantle bridgmanite
  8. Different structural behavior of MgSiO3 and CaSiO3 glasses at high pressures
  9. High-pressure phase transitions of Fe-bearing orthopyroxene revealed by Raman spectroscopy
  10. High P-T phase relations of Al-bearing magnetite: Post-spinel phases as indicators for P-T conditions of formation of natural samples
  11. Magnesio-ferri-hornblende, □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2, a new member of the amphibole supergroup
  12. A multivariate statistical approach for mineral geographic provenance determination using laser-induced breakdown spectroscopy and electron microprobe chemical data: A case study of copper-bearing tourmalines
  13. Characteristics of congruent dissolution of silicate minerals enhanced by chelating ligand under ambient conditions
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  16. A machine learning approach to discrimination of igneous rocks and ore deposits by zircon trace elements
  17. Book Review
  18. RIMG Volume 88: Diamond: Genesis, Mineralogy and Geochemistry
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