Startseite A new experimental approach to study fluid–rock equilibria at the slab-mantle interface based on the synthetic fluid inclusion technique
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A new experimental approach to study fluid–rock equilibria at the slab-mantle interface based on the synthetic fluid inclusion technique

  • Alexandra Tsay EMAIL logo , Zoltan Zajacz , Peter Ulmer , Markus Waelle und Carmen Sanchez-Valle
Veröffentlicht/Copyright: 30. September 2016
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 101 Heft 10

Abstract

The role of high-pressure aqueous fluids in mass transfer processes during slab dehydration has been recognized for a long time. However, the quantitative assessment of their material transport capacity in complex natural systems remains poorly understood, mainly as a consequence of their unquenchable nature and current experimental limitations. A new experimental approach has been developed to investigate complex fluid–rock equilibria at high-pressure and -temperature conditions relevant for slab dehydration processes. Aqueous fluids pre-equilibrated with high-pressure mineral assemblages were sampled at run conditions in the form of synthetic fluid inclusions (SFI) in quartz and subsequently analyzed by laser-ablation ICPMS (LA-ICP-MS). The main innovation introduced in the experiments is that the quartz crystal was fractured in situ during the run only after chemical equilibrium between phases has been achieved, thus allowing the entrapment of fluid inclusions that sample true equilibrium compositions. An efficient fracturing of quartz at high-pressure and temperature conditions was achieved by crossing the e-quartz–coesite reaction boundary, which occurs at pressures of the sub-arc slab-mantle interface. An experimental methodology has been developed to implement this strategy and experiments in the eclogite–water system were conducted to demonstrate the feasibility and advantage of the method. The results demonstrate that secondary fluid inclusions formed early in pre-fractured quartz are systematically diluted compared to secondary inclusions formed after in situ fracturing of quartz, particularly for elements such as Sr, Zr, Nb, Ti, and Mg. These observations demonstrate that early entrapment of fluids in pre-fractured quartz do not represent equilibrium fluids at high-pressure-temperature conditions.

Keywords: Subduction zone; magma; slab dehydration; high-pressure fluids; synthetic fluid inclusions

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

Acknowledgments

We thank Peter Tropper, Codi Lazar, and an anonymous reviewer for their constructive reviews, which were helpful to improve the quality of this manuscript. Furthermore, we are very grateful to Dionysis Foustoukos for the editorial handling of the manuscript and for his constructive comments. Alexandra Tsay also acknowledges the SNSF early postdoc Mobility fellowship (No. P2EZP2_155583).

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Received: 2015-11-5
Accepted: 2016-5-25
Published Online: 2016-9-30
Published in Print: 2016-10-1

© 2016 by Walter de Gruyter Berlin/Boston

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  2. Temporal histories of Cordilleran continental arcs: testing models for magmatic episodicity
  3. Chemistry and Mineralogy of Earth’s Mantle
  4. Graphite-diamond relations in mantle rocks: Evidence from an eclogitic xenolith from the Udachnaya kimberlite (Siberian Craton)
  5. Special Collection: From Magmas to Ore Deposits
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  7. Special collection: perspectives on origins and evolution of crustal magmas
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  10. A new experimental approach to study fluid–rock equilibria at the slab-mantle interface based on the synthetic fluid inclusion technique
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  17. Research Article
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https://doi.org/10.2138/am-2016-5621
Schlagwörter für diesen Artikel
Subduction zone; magma; slab dehydration; high-pressure fluids; synthetic fluid inclusions

Artikel in diesem Heft

  1. Research Article
  2. Temporal histories of Cordilleran continental arcs: testing models for magmatic episodicity
  3. Chemistry and Mineralogy of Earth’s Mantle
  4. Graphite-diamond relations in mantle rocks: Evidence from an eclogitic xenolith from the Udachnaya kimberlite (Siberian Craton)
  5. Special Collection: From Magmas to Ore Deposits
  6. Association of cumulus apatite with compositionally unusual olivine and plagioclase in the Taihe Fe-Ti oxide ore-bearing layered mafic-ultramafic intrusion: Petrogenetic significance and implications for ore genesis
  7. Special collection: perspectives on origins and evolution of crustal magmas
  8. Repeated, multiscale, magmatic erosion and recycling in an upper-crustal pluton: implications for magma chamber dynamics and magma volume estimates
  9. Fluids in the Crust
  10. A new experimental approach to study fluid–rock equilibria at the slab-mantle interface based on the synthetic fluid inclusion technique
  11. Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
  12. Fe-Mg interdiffusion in orthopyroxene
  13. Special Collection: Rates and Depths of Magma Ascent on Earth
  14. Error sources in single-clinopyroxene thermobarometry and a mantle geotherm for the Novinka kimberlite, Yakutia
  15. Water in nominally hydrous and anhydrous minerals
  16. Experimental hydration of natural volcanic clinopyroxene phenocrysts under hydrothermal pressures (0.5–3 kbar)
  17. Research Article
  18. Comparison of isoelectric points of single-crystal and polycrystalline α-Al2O3 and α-Fe2O3 surfaces
  19. Research Article
  20. Synthetic olivine capsules for use in experiments
  21. Research Article
  22. Visible and short-wave infrared reflectance spectroscopy of REE phosphate minerals
  23. Research Article
  24. Protolith carbon isotope ratios in cordierite from metamorphic and igneous rocks
  25. Research Article
  26. Empirical electronic polarizabilities of ions for the prediction and interpretation of refractive indices: Oxides and oxysalts
  27. Research Article
  28. A novel protocol for resolving feldspar crystals in synchrotron X-ray microtomographic images of crystallized natural magmas and synthetic analogs
  29. Research Article
  30. Silicic lunar volcanism: Testing the crustal melting model
  31. Research Article
  32. Transition metals in the transition zone: Crystal chemistry of minor element substitution in wadsleyite
  33. Research Article
  34. Experimental evidence of the formation of intermediate phases during transition of kaolinite into metakaolinite
  35. Letter
  36. Further observations related to a possible occurrence of terrestrial ahrensite
  37. Letter
  38. Chemical zoning and lattice distortion in uraninite from Olympic Dam, South Australia
  39. Research Article
  40. New Mineral Names
  41. Book Review
  42. Book review: Layered Intrusions
  43. Book Review
  44. Book Review: Mineral Resources, Economics and the Environment, 2nd edition
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