Startseite Trace element partitioning between anhydrite, sulfate melt, and silicate melt
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Trace element partitioning between anhydrite, sulfate melt, and silicate melt

  • C. Hutchinson Michael , A. Brooker Richard , D. Blundy Jon , H. Dilles John und T. Lewis Charles
Veröffentlicht/Copyright: 2. März 2023
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 108 Heft 3

Abstract

Anhydrite has become increasingly recognized as a primary igneous phase since its discovery in pumices from the 1982 eruption of El Chichón, Mexico. Recent work has provided evidence that immiscible sulfate melts may also be present in high-temperature, sulfur-rich, arc magmas. In this study we present partition coefficients for 37 trace elements between anhydrite, sulfate melt and silicate melt based on experiments at 0.2–1 GPa, 800–1200 °C, and fO2 > NNO+2.5.

Sulfate melt–silicate melt partition coefficients are shown to vary consistently with ionic potential (the ratio of nominal charge to ionic radius, Z/r) and show peaks in compatibility close to the ionic potential of Ca and S. Partition coefficients for many elements, particularly REE, are more than an order of magnitude lower than previously published data, likely related to differences in silicate melt composition between the studies. Several highly charged cations, including V, W, and Mo are somewhat compatible in sulfate melt but are strongly incompatible in anhydrite. Their concentrations in quench material from natural samples may help to fingerprint the original presence of sulfate melt.

Partition coefficients for 2+ and 3+ cations between anhydrite and silicate melt vary primarily as a function of the calcium partition coefficients (DCaAnh-Sil) and can be described in terms of exchange reactions involving the Ca2+ site in anhydrite. Trivalent cations are dominantly charge-balanced by Na1+. Most data are well fit using a simple lattice-strain model, although some features of the partitioning data, including DLaAnh-Sil > DCaAnh-Sil, suggest the occurrence of two distinct anhydrite Ca-sites with slightly different optimum radii at the experimental conditions.

The ratio DSrAnh-Sil / DCaAnh-Sil is shown to be relatively insensitive to silicate melt composition and should vary from 0.63–0.53 between 1200–800 °C, based on a simple, “one-site” lattice strain model. Comparison to DSrAnh-Sil and DCaAnh-Sil calculated for natural anhydrite suggests that in most cases, including the S-rich eruptions of Pinatubo and El Chichón, the composition of anhydrite is consistent with early crystallization of anhydrite close to the liquidus of silicate melt with a composition approximately that of the bulk erupted material. This illustrates how anhydrite (and perhaps sulfate melt) provides a mechanism to transport large quantities of sulfur from significant depth to the eruptive environment.

Keywords: Sulfate melt; arc magmas; anhydrite; trace element partitioning; experimental petrology

Acknowledgments and funding

We express our gratitude to Frank Tepley, Stuart Kearns, and Ben Buse for assistance with microprobe analyses, to Richard Hinton and Cristina Talavera for help with SIMS analyses, and to Melanie Barnes and Kevin Werts for LA-ICP-MS analyses. We also thank Yuan Li and Ilya Veksler for their careful reviews. Support for this project came from National Science Foundation grant EAR-1624547. Ion probe time was supported by grant IMF608/1016.

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Received: 2021-10-11
Accepted: 2022-03-03
Published Online: 2023-03-02
Published in Print: 2023-03-28

© 2023 by Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8345
Schlagwörter für diesen Artikel
Sulfate melt; arc magmas; anhydrite; trace element partitioning; experimental petrology

Artikel in diesem Heft

  1. Mineralogy and bulk geochemistry of a fumarole at Hverir, Iceland: Analog for acid-sulfate leaching on Mars
  2. The crystal structure and chemistry of natural giniite and implications for Mars
  3. Solid solution of CaSiO3 and MgSiO3 perovskites in the lower mantle: The role of ferrous iron
  4. Secondary ion mass spectrometer analyses for trace elements in glass standards using variably charged silicon ions for normalization
  5. Raman shifts of c-BN as an ideal P-T sensor for studying water-rock interactions in a diamond-anvil cell
  6. Resetting of the U-Pb and Th-Pb systems in altered bastnäsite: Insight from the behavior of Pb at nanoscale
  7. X-ray diffraction reveals two structural transitions in szomolnokite
  8. Contamination of heterogeneous lower crust in Hannuoba tholeiite: Evidence from in situ trace elements and strontium isotopes of plagioclase
  9. Oxygen fugacity buffering in high-pressure solid media assemblies from IW-6.5 to IW+4.5 and application to the V K-edge oxybarometer
  10. Trace element partitioning between anhydrite, sulfate melt, and silicate melt
  11. Chemical reaction between ferropericlase (Mg,Fe)O and water under high pressure-temperature conditions of the deep lower mantle
  12. Composition-dependent thermal equation of state of B2 Fe-Si alloys at high pressure
  13. Effects of thermal annealing on water content and δ18O in zircon
  14. Tourmaline and zircon trace the nature and timing of magmatic-hydrothermal episodes in granite-related Sn mineralization: Insights from the Libata Sn ore field
  15. Cation ordering, twinning, and pseudo-symmetry in silicate garnet: The study of a birefringent garnet with orthorhombic structure
  16. The occurrence of monoclinic jarosite in natural environments
  17. Niobium speciation in minerals revealed by L2,3-edges XANES spectroscopy
  18. The first occurrence of the carbide anion, C4–, in an oxide mineral: Mikecoxite, ideally (CHg4)OCl2, from the McDermitt open-pit mine, Humboldt County, Nevada, U.S.A
  19. Hydrothermal alteration of Ni-rich sulfides in peridotites of Abu Dahr, Eastern Desert, Egypt: Relationships among minerals in the Fe-Ni-Co-O-S system, fO2 and fS2
  20. New Mineral Names: Arsenic and Lead
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