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High-temperature and high-pressure behavior of carbonates in the ternary diagram CaCO3-MgCO3-FeCO3

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Published/Copyright: June 3, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 6

Abstract

We report the thermal expansion and the compressibility of carbonates in the ternary compositional diagram CaCO3-MgCO3-FeCO3, determined by in situ X-ray powder and single-crystal diffraction. High-temperature experiments were performed by high-resolution X-ray synchrotron powder diffraction from ambient to decarbonation temperatures (25–850 °C). Single-crystal synchrotron X ray diffraction experiments were performed in a variable pressure range (0–100 GPa), depending on the stability field of the rhombohedral structure at ambient temperature, which is a function of the carbonate composition. The thermal expansion increases from calcite, CaCO3, α0 = 4.10(7) ×10–5 K–1, to magnesite, MgCO3, α0 = 7.04(2) ×10–5 K–1. In the magnesite-siderite (FeCO3) join, the thermal expansion decreases as iron content increases, with an experimental value of α0 = 6.44(4) ×10–5 K–1 for siderite. The compressibility in the ternary join is higher (i.e., lower bulk modulus) in calcite and Mg-calcite [K0 = 77(3) GPa for Ca0.91Mg0.06Fe0.03(CO3)] than in magnesite, K0 = 113(1) GPa, and siderite, K0 = 125(1) GPa. The analysis of thermal expansion and compressibility variation in calcite-magnesite and calcite-iron-magnesite joins clearly shows that the structural changes associated to the order-disorder transitions [i.e., R3c calcite-type structure vs. R3 CaMg(CO3)2 dolomite-type structure] do not affect significantly the thermal expansion and compressibility of carbonate. On the contrary, the chemical compositions of carbonates play a major role on their thermo-elastic properties. Finally, we use our P-V-T equation of state data to calculate the unit-cell volume of a natural ternary carbonate, and we compare the calculated volumes to experimental observations, measured in situ at elevated pressure and temperatures, using a multi-anvil device. The experimental and calculated data are in good agreement demonstrating that the equation of state here reported can describe the volume behavior with the accuracy needed, for example, for a direct chemical estimation of carbonates based on experimental unit-cell volume data of carbonates at high pressures and temperatures.

Key words: Carbonates; high temperature; high pressure; equation of state

† Present address: Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, Ohio 44106, U.S.A.

‡ Present address: Université de Toulouse, Toulouse, France

§ Present address: Materials Science Beamline, SESAME–Synchrotron Light for Experimental Science and Applications in the Middle East, Allan, PO Box 7, Al Balq’a 19252, Jordan

Acknowledgments

We acknowledge Andrea Risplendente and Nicola Rotiroti for the assistance in the microprobe analysis and single-crystal laboratory diffraction. We acknowledge Elettra Syncrotron Facility for provision of beamtime (experiment 20125293, 20135433). We acknowledge ESRF for provision of beamtime (experiment ES142, ES209). M.M. acknowledge DCO support.

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Received: 2015-6-10
Accepted: 2016-2-5
Published Online: 2016-6-3
Published in Print: 2016-6-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5458
Keywords for this article
Carbonates; high temperature; high pressure; equation of state

Articles in the same Issue

  1. Invited Centennial Article
  2. On the nature and significance of rarity in mineralogy
  3. Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
  4. Zircon saturation and Zr diffusion in rhyolitic melts, and zircon growth geospeedometer
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  7. Special collection: advances in ultrahigh-pressure metamorphism
  8. Discovery of in situ super-reducing, ultrahigh-pressure phases in the Luobusa ophiolitic chromitites, Tibet: new insights into the deep upper mantle and mantle transition zone
  9. Special collection: from magmas to ore deposits
  10. Uraninite from the Olympic Dam IOCG-U-Ag deposit: linking textural and compositional variation to temporal evolution
  11. Special collection: from magmas to ore deposits
  12. A story of olivine from the McIvor Hill complex (Tasmania, Australia): Clues to the origin of the Avebury metasomatic Ni sulfide deposit
  13. Special collection: perspectives on origins and evolution of crustal magmas
  14. The origin of extensive Neoarchean high-silica batholiths and the nature of intrusive complements to silicic ignimbrites: Insights from the Wyoming batholith, U.S.A.
  15. Special collection: perspectives on origins and evolution of crustal magmas
  16. From the Hadean to the Himalaya: 4.4 Ga of felsic terrestrial magmatism
  17. Spinels renaissance: the past, present, and future of those ubiquitous minerals and materials
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