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The effect of halogens (F, Cl) on the near-liquidus crystallinity of a hydrous trachyte melt

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Veröffentlicht/Copyright: 27. Mai 2022
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 107 Heft 6

Abstract

The effect of F and Cl on the liquidus temperature of a hydrous (~3.5–4 wt% H2O) trachytic melt (~66 wt% SiO2) at 925 to 990 °C and at 100 MPa has been experimentally investigated. We employed a novel disequilibrium approach involving diffusion couple experiments with the two-diffusion couple end-members differing solely in halogen concentrations. A shift of the liquidus temperature by ~50 °C was observed between a halogen-poor and halogen-enriched melt. Each experiment spanned the entire range of F and Cl concentrations between the two end-member compositions. We determined the halogen concentrations at the transition from crystal-bearing to crystal-free melt. These concentrations correspond to the liquidus halogen concentrations of the melt at each experimental temperature. We demonstrate that there is a limiting halogen concentration (~0.19–0.52 wt% F; ~0.07–0.24 wt% Cl), below which the melt crystallizes spherulitic clinopyroxene during heating to the run temperature. At high temperatures, upon diffusion of F and Cl into the halogen-poor melt, those crystals dissolve, leaving behind a dissolution front parallel to the diffusion interface. We propose that the dissolution is a consequence of F and Cl complexing with some of the main cationic components of clinopyroxene (Mg, Fe, Ca), thereby destabilizing this phase. Thus, the experimental dissolution of clinopyroxene is a manifestation of a liquidus depression caused by increased halogen content. Our results show that the liquidus shifts at a rate of ~1575(379) K/mol% of F and Cl in the melt, which is a minimum estimate, assuming both halogens equally drive dissolution. This liquidus depression is valid for a range of halogen concentrations (~0.06–0.87 wt% F; ~0.06–0.36 wt% Cl) and the experimental temperatures. Our findings illustrate that the degassing of halogens during or prior to an eruption can enhance crystallization in the melt and therefore influence magma physical properties that may ultimately affect eruption style.

Keywords: Halogens; liquidus depression; phase equilibria; diffusion couple; crystal dissolution; Halogens in Planetary Systems

† Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.

Funding statement: This research is part of the Ph.D. thesis of Y. Feisel and is supported by a fellowship of the Gutenberg Research College of the Johannes Gutenberg-University of Mainz to D.B. Dingwell. D.B. Dingwell acknowledges the support of ERC 2018 ADV Grant 834225 (EAVESDROP). Part of this research was performed within the infrastructure established by the VAMOS research center of the Johannes Gutenberg-University, Mainz.

Acknowledgments

We appreciate the help of B. Scheu, U. Kueppers, and K.-U. Hess with sample preparation and thank N. Groschopf, S. Buhre, and T. Haeger for their assistance with electron microprobe and Raman analyses. The authors thank J. Filiberto and two anonymous reviewers for their perceptive reviews and A. Cadoux for the editorial handling of this manuscript.

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Received: 2021-04-29
Accepted: 2021-11-05
Published Online: 2022-05-27
Published in Print: 2022-05-27

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8120
Schlagwörter für diesen Artikel
Halogens; liquidus depression; phase equilibria; diffusion couple; crystal dissolution; Halogens in Planetary Systems

Artikel in diesem Heft

  1. Periodic and non-periodic stacking in molybdenite (MoS2) revealed by STEM
  2. The effect of halogens (F, Cl) on the near-liquidus crystallinity of a hydrous trachyte melt
  3. Occurrence of tuite and ahrensite in Zagami and their significance for shock-histories recorded in martian meteorites
  4. Zolenskyite, FeCr2S4, a new sulfide mineral from the Indarch meteorite
  5. Refined estimation of Li in mica by a machine learning method
  6. Olivine in picrites from continental flood basalt provinces classified using machine learning
  7. The glass transition and the non-Arrhenian viscosity of carbonate melts
  8. Etching of fission tracks in monazite: Further evidence from optical and focused ion beam scanning electron microscopy
  9. The low-temperature shift of antigorite dehydration in the presence of sodium chloride: In situ diffraction study up to 3 GPa and 700 °C
  10. Chemistry-dependent Raman spectral features of glauconite and nontronite: Implications for mineral identification and provenance analysis
  11. Experimental determination of solubility constants of saponite at elevated temperatures in high ionic strength solutions
  12. Hydrothermal troctolite alteration at 300 and 400 °C: Insights from flexible Au-reaction cell batch experimental investigations
  13. Timescales and rates of intrusive and metamorphic processes determined from zircon and garnet in migmatitic granulite, Fiordland, New Zealand
  14. In situ chemical and isotopic analyses and element mapping of multiple-generation pyrite: Evidence of episodic gold mobilization and deposition for the Qiucun epithermal gold deposit in Southeast China
  15. Hydrothermal mineralization of celadonite: Hybridized fluid–basalt interaction in Janggi, Korea
  16. Gungerite, TlAs5Sb4S13, a new thallium sulfosalt with a complex structure containing covalent As-As bonds
  17. Nitscheite, (NH4)2[(UO2)2(SO4)3(H2O)2]·3H2O, a new mineral with an unusual uranyl-sulfate sheet
  18. Protocaseyite, a new decavanadate mineral containing a [Al4(OH)6(H2O)12]6+ linear tetramer, a novel isopolycation
  19. Fission-track etching in apatite: A model and some implications
  20. Hydrothermal monazite trumps rutile: Applying U-Pb geochronology to evaluate complex mineralization ages of the Katbasu Au-Cu deposit, Western Tianshan, Northwest China
  21. Erratum
Heruntergeladen am 17.4.2026 von https://www.degruyterbrill.com/document/doi/10.2138/am-2022-8120/html
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