Startseite Evaluation and application of the quartz-inclusions-in-epidote mineral barometer
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Evaluation and application of the quartz-inclusions-in-epidote mineral barometer

  • Miguel Cisneros ORCID logo EMAIL logo , Kyle T. Ashley und Robert J. Bodnar
Veröffentlicht/Copyright: 11. August 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 8

Abstract

We have examined the suitability of a quartz-inclusions-in-epidote (qtz-in-ep) mineral barometer to better constrain P-T histories of epidote-bearing lithologies. Theoretical calculations applying an isotropic elastic model suggest that the qtz-in-ep barometer exhibits minimal temperature dependence, and thus, offers the potential to constrain growth conditions of epidote in various geologic environments, including skarn deposits, epidote-bearing granitoids, and metamorphic rocks.

To test if the applied equations of state and isotropic elastic model reasonably simulate the elastic evolution of two anisotropic minerals, we measured Raman shifts of the 464 cm–1 band of quartz inclusions relative to that of an unencapsulated quartz standard. We calculated a quartz inclusion pressure (Pincl464)at various temperatures and compared these values with temperature-dependent Pincl predicted by elastic modeling (Pinclmod)at elevated temperatures. Three epidote-bearing samples with reasonably well-constrained P-T histories were also examined: (1) sample HF14C from the Upper Schieferhuelle in the Western Tauern Window, Italy (Pincl464=0.01GPa);(2) sample LdC-31C from Lago di Cignana, Italy (Pincl464≈0.16)GPa); and (3) sample FT1E from the Frosnitz Tal in the Western Tauern region, Austria (Pincl464=0.57 GPa).

Entrapment pressures (Pent464)calculated from Pincl464determined at various temperatures show nominal differences from Pentcalculated from Pinclmod,suggesting that for qtz-in-ep pairs, the calculated Pent does not significantly vary with the temperature of measurement. Furthermore, our calculated Pent464for a sample from the Upper Schieferhuelle is in agreement with petrographic context and previously established P conditions, and the Pent464determined for the Frosnitz Tal sample closely approximate previously reported pressures. The Lago di Cignana sample is derived from an epidote vein that is encased in a high-P foliation, and the calculated Pent464is consistent with early, low-P epidote vein formation that pre-dates high-P metamorphism, or alternatively, late vein formation during exhumation, and confirms that the epidote did not form at or near peak conditions (~2.0 GPa). The results of this study indicate that the qtz-in-ep barometer potentially provides another tool that geoscientists can employ to better constrain P-T conditions in some epidote-bearing environments, where conventional thermobarometric techniques cannot be applied.

Keywords: Elastic thermobarometry; epidote; Raman spectroscopy; quartz inclusions; thermobarometry; Applications of Fluid; Mineral; and Melt Inclusions

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

Acknowledgments

The authors thank J. Selverstone for providing the reference samples used in this study and for informal reviews, M. Alvaro and R. Angel for help with evaluating P-T-V data, M. Murri and N. Campomenosi for discussions about Raman data reduction, and M. Mazzuchelli and M Gilio for helpful manuscript comments. We thank C. Cannatelli and D. Baker for editorial handling, and F. Spear and an anonymous reviewer for constructive reviews that greatly improved this manuscript. We thank T. Holland for assistance with modeling quartz volumes and Charles Farley for assistance with use of the Raman microprobe at Virginia Tech.

Funding

  1. This work was supported by a Geological Society of America Student Research Grant and a Ford Foundation Fellowship awarded to M.C., and National Science Foundation Grants (EAR-1725110) awarded to J. Barnes, W. Behr, and D. Stockli, and to R.B. (EAR-1624589).

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Received: 2019-05-13
Accepted: 2020-02-02
Published Online: 2020-08-11
Published in Print: 2020-08-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2020-7379
Schlagwörter für diesen Artikel
Elastic thermobarometry; epidote; Raman spectroscopy; quartz inclusions; thermobarometry; Applications of Fluid; Mineral; and Melt Inclusions

Artikel in diesem Heft

  1. Outlooks in Earth and Planetary Materials
  2. Are quasicrystals really so rare in the Universe?
  3. Reaction between Cu-bearing minerals and hydrothermal fluids at 800 °C and 200 MPa: Constraints from synthetic fluid inclusions
  4. Evaluation and application of the quartz-inclusions-in-epidote mineral barometer
  5. Let there be water: How hydration/dehydration reactions accompany key Earth and life processes
  6. Origin of corundum within anorthite megacrysts from anorthositic amphibolites,Granulite Terrane, Southern India
  7. Raman spectroscopy study of manganese oxides: Tunnel structures
  8. Experimental constraints on the partial melting of sediment-metasomatized lithospheric mantle in subduction zones
  9. Interlayer energy of pyrophyllite: Implications for macroscopic friction
  10. Thermodynamic and thermoelastic properties of wurtzite-ZnS by density functional theory
  11. The nature of Zn-phyllosilicates in the nonsulfide Mina Grande and Cristal zinc deposits (Bongará District, Northern Peru): The TEM-HRTEM and AEM perspective
  12. Orthovanadate wakefieldite-(Ce) in symplectites replacing vanadium-bearing omphacite in the ultra-oxidized manganese deposit of Praborna (Aosta Valley, Western Italian Alps)
  13. A simple and effective capsule sealing technique for hydrothermal experiments
  14. Metamorphic amphiboles in the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin: Implications for potential resource development
  15. Letter
  16. The chlorine-isotopic composition of lunar KREEP from magnesian-suite troctolite 76535
  17. New Mineral Names
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