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Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems

  • Mike Cassidy , Alexander A. Iveson , Madeleine C.S. Humphreys , Tamsin A. Mather , Christoph Helo , Jonathan M. Castro , Philipp Ruprecht , David M. Pyle and EIMF
Published/Copyright: September 29, 2022
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American Mineralogist
From the journal American Mineralogist Volume 107 Issue 10

Abstract

The conditions under which halogens partition in favor of an exsolved fluid relative to the coexisting melt are key for understanding many magmatic processes, including volcanic degassing, evolution of crustal melt bodies, and ore formation. We report new F, Cl, and Br fluid/melt partition coefficients for intermediate to silicic melts, for which F and Br data are particularly lacking; and for varying CO2- H2O contents to assess the efects of changing fluid composition (XH2O) on Br fluid/melt partitioning for the first time. The experiments were conducted at pressures 50–120 MPa, temperatures 800–1100 °C, and volatile compositions [molar XH2O = H2O/(H2O +CO2)] of 0.55 to 1, with redox conditions around the Nickel-Nickel Oxygen bufer (ƒO2 ≈ NNO). Experiments were not doped with Cl, Br, or F and were conducted on natural crystal-bearing volcanic products at conditions close to their respective pre-eruptive state. The experiments therefore provide realistic constraints on halogen partitioning at naturally occurring, brine-undersaturated conditions. Measurements of Br, Cl, and F were made by Secondary Ion Mass Spectrometry (SIMS) on 13 experimental glass products spanning andesite to rhyolitic compositions, together with their natural starting materials from Kelud volcano, Indonesia, and Quizapu volcano, Chile. Fluid compositions were constrained by mass balance. Average bulk halogen fluid/melt partition coefficients and standard deviations are: DCl fluid/melt = 3.4 (±3.7 1 s.d.), DFfluid/melt = 1.7 (±1.7), and DBrfluid/melt = 7.1 (±6.4) for the Kelud starting material (bulk basaltic andesite), and DCl fluid/melt = 11.1 (±3.5), DFfluid/melt = 0.8 (±0.8), and DBr fluid/melt = 31.3 (±20.9) for Quizapu starting material (bulk dacite). The large range in average partition coeficients is a product of changing XH2O, pressure and temperature. In agreement with studies on synthetic melts, our data show an exponential increase of halogen Dfluid/melt with increasing ionic radius, with partitioning behavior controlled by melt composition according to the nature of the complexes forming in the melt (e.g., SiF4, NaCl, KBr). The fundamental chemistry of the diferent halogens (differing ionic size and electronegativities) controls the way in which partitioning responds to changes in melt composition and other variables. Experimental results confirm that more Cl partitions into the fluid at higher bulk Cl contents, higher melt Na, higher fluid XH2O ratios, and lower temperatures. Bromine shows similar behavior, though it seems to be more sensitive to temperature and less sensitive to Na content and XH2O. In contrast, F partitioning into the fluid increases as the melt silica content decreases (from 72 to 56 wt% SiO2), which we attribute to the lower abundance of Si available to form F complexes in the melt. These new data provide more insights into the conditions and processes that control halogen degassing from magmas and may help to inform the collection and interpretation of melt inclusions and volcano gas data.

Keywords: Halogens; experiments; chlorine; fluorine; bromine; magma; volcanic gas; Experimental Halogens in Honor of Jim Webster

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

Funding statement: M.C. acknowledges funding from NERC Independent Research fellowship NE/N014286/1. A.A.I. is currently funded by the Leverhulme Trust through an Early Career Fellowship. P.R. acknowledges funding from U.S. NSF grant EAR 1347880/1717288.

Acknowledgments

Vitaly Chevchelov is thanked for the inclusion of compositional data. We thank Jon Wade and Phil Gopon for electron microprobe assistance and Richard Thomas and Bernie Wood for discussion. Thor Hansteen and an anonymous reviewer are thanked for their helpful comments to improve this paper.

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Received: 2021-04-21
Accepted: 2021-09-18
Published Online: 2022-09-29
Published in Print: 2022-10-26

© 2022 Mineralogical Society of America

Articles in the same Issue

  1. Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems
  2. Spectroscopic study on the local structure of sulfate ( S O 4 2 − ) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)- S O 4 2 − -bearing minerals formation
  3. Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
  4. Raman scattering and Cr3+ luminescence study on the structural behavior of δ-AlOOH at high pressures
  5. Jadeite and related species in shocked meteorites: Limitations on inference of shock conditions
  6. Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures
  7. Estimating ferric iron content in clinopyroxene using machine learning models
  8. Pyradoketosite, a new, unexpected, polymorph of Ag3SbS3 from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy)
  9. Pyrite geochemistry and its implications on Au-Cu skarn metallogeny: An example from the Jiguanzui deposit, Eastern China
  10. Synthesis of ferrian and ferro-saponites: Implications for the structure of (Fe,Mg)-smectites formed under reduced conditions
  11. Natural cubic perovskite, Ca(Ti,Si,Cr)O3–δ, a versatile potential host for rock-forming and less-common elements up to Earth’s mantle pressure
  12. Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P
  13. Zinconigerite-2N1S ZnSn2Al12O22(OH)2 and zinconigerite-6N6S Zn3Sn2Al16O30(OH)2, two new minerals of the nolanite-spinel polysomatic series from the Xianghualing skarn, Hunan Province, China
  14. Tracing structural relicts of the ikaite-to-calcite transformation in cryogenic cave glendonite
  15. Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition
  16. New Mineral Names
https://doi.org/10.2138/am-2022-8109
Keywords for this article
Halogens; experiments; chlorine; fluorine; bromine; magma; volcanic gas; Experimental Halogens in Honor of Jim Webster

Articles in the same Issue

  1. Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems
  2. Spectroscopic study on the local structure of sulfate ( S O 4 2 − ) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)- S O 4 2 − -bearing minerals formation
  3. Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
  4. Raman scattering and Cr3+ luminescence study on the structural behavior of δ-AlOOH at high pressures
  5. Jadeite and related species in shocked meteorites: Limitations on inference of shock conditions
  6. Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures
  7. Estimating ferric iron content in clinopyroxene using machine learning models
  8. Pyradoketosite, a new, unexpected, polymorph of Ag3SbS3 from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy)
  9. Pyrite geochemistry and its implications on Au-Cu skarn metallogeny: An example from the Jiguanzui deposit, Eastern China
  10. Synthesis of ferrian and ferro-saponites: Implications for the structure of (Fe,Mg)-smectites formed under reduced conditions
  11. Natural cubic perovskite, Ca(Ti,Si,Cr)O3–δ, a versatile potential host for rock-forming and less-common elements up to Earth’s mantle pressure
  12. Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P
  13. Zinconigerite-2N1S ZnSn2Al12O22(OH)2 and zinconigerite-6N6S Zn3Sn2Al16O30(OH)2, two new minerals of the nolanite-spinel polysomatic series from the Xianghualing skarn, Hunan Province, China
  14. Tracing structural relicts of the ikaite-to-calcite transformation in cryogenic cave glendonite
  15. Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition
  16. New Mineral Names
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