Startseite Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900–1450 °C
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Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900–1450 °C

  • Anton Shatskiy EMAIL logo , Yuri M. Borzdov , Konstantin D. Litasov , Igor S. Sharygin , Yuri N. Palyanov und Eiji Ohtani
Veröffentlicht/Copyright: 10. Januar 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 100 Heft 1

Abstract

Phase relations in the system K2CO3-CaCO3 have been studied in the compositional range, X(K2CO3), from 100 to 10 mol%, at 6.0 GPa and 900-1450 °C. At 900-950 °C, the system has three intermediate compounds: K6Ca2(CO3)5, K2Ca(CO3)2, and K2Ca3(CO3)4. The K2Ca(CO3)2 compound decomposes to the K6Ca2(CO3)5 + K2Ca3(CO3)4 assembly above 950 °C. The K6Ca2(CO3)5 and K2Ca3(CO3)4 compounds melt congruently slightly above 1200 and 1300 °C, respectively. The eutectics were established at 64 and 44 mol% near 1200 °C and at 23 mol% near 1300 °C. K2CO3 remains as a liquidus phase at 1300 °C and 75 mol% and melts at 1425 ± 20 °C. Aragonite remains as a liquidus phase at 1300 °C and 20 mol% and at 1400 °C and 10 mol%. CaCO3 solubility in K2CO3 and K2CO3 solubility in aragonite are below the detection limit (<0.5 mol%).

Infiltration of subduction-derived K-rich Ca-Mg-Fe-carbonatite into the Fe0-saturated mantle causes the extraction of (Mg,Fe)CO3 components from the melt, which shifts its composition toward K-Ca-carbonatite. According to our data this melt can be stable at the P-T conditions of subcratonic lithosphere with geothermal gradient of 40 mW/m2 corresponding to temperature of 1200 °C at 6 GPa.

Keywords: Alkaline carbonates; buetschliite; fairchildite; high-pressure experiment; carbonatite; Earth’s mantle
Received: 2014-4-8
Accepted: 2014-8-6
Published Online: 2015-1-10
Published in Print: 2015-1-1

© 2015 by Walter de Gruyter Berlin/Boston

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  3. Mineral evolution and Earth history
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  7. The structure of water-saturated carbonate melts
  8. In-situ measurements of fluorine and chlorine speciation and partitioning between melts and aqueous fluids in the Na2O-Al2O3-SiO2-H2O system
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  19. Atomistic simulation on mixing thermodynamics of calcite-smithsonite solid solutions
  20. Combined geochemistry and geochronology constrains coupled subduction of oceanic and continental crust in the Huwan shear zone, central China
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  22. First-principles study of sulfur isotope fractionation in pyrite-type disulfides
  23. Tetrataenite in terrestrial rock
  24. Thermo-compression of pyrope-grossular garnet solid solutions: Non-linear compositional dependence
  25. Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900–1450 °C
  26. Trace-element partitioning between plagioclase, alkali feldspar, Ti-magnetite, biotite, apatite, and evolved potassic liquids from Campi Flegrei (Southern Italy)
  27. Synthetic and natural ammonium-bearing tourmaline
  28. Anhydrite stability and the effect of Ca on the behavior of sulfur in felsic magmas
  29. Nuragheite, Th(MoO4)2·H2O, The Second Natural Thorium Molybdate And Its Relationships To Ichnusaite And Synthetic Th(MoO4)2†
  30. Structural Effects On Incorporated Water In Carbonated Apatites
  31. New Constraints On Electron-Beam Induced Halogen Migration In Apatite
  32. Origin Of The Lunar Highlands Mg-Suite: An Integrated Petrology, Geochemistry, Chronology, And Remote Sensing Perspective
  33. An In Situ High-Pressure Nmr Study Of Sodium Coordination Environment Compressibility In Albite Glass
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https://doi.org/10.2138/am-2015-5001
Schlagwörter für diesen Artikel
Alkaline carbonates; buetschliite; fairchildite; high-pressure experiment; carbonatite; Earth’s mantle

Artikel in diesem Heft

  1. The American Mineralogist at 100 years, and a mineralogy renaissance
  2. At the blurry edge of mineralogy
  3. Mineral evolution and Earth history
  4. Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex
  5. The rapid expansion of environmental mineralogy in unconventional ways: Beyond the accepted definition of a mineral, the latest technology, and using nature as our guide
  6. Microelectronic junctions in arsenian pyrite due to impurity and mixed sulfide heterogeneity
  7. The structure of water-saturated carbonate melts
  8. In-situ measurements of fluorine and chlorine speciation and partitioning between melts and aqueous fluids in the Na2O-Al2O3-SiO2-H2O system
  9. High-pressure high-temperature transitions in MgCr2O4 and crystal structures of new Mg2Cr2O5 and post-spinel MgCr2O4 phases with implications for ultrahigh-pressure chromitites in ophiolites
  10. Mid-infrared emission spectroscopy and visible/near-infrared reflectance spectroscopy of Fe-sulfate minerals
  11. Megacrystic zircon with planar fractures in miaskite-type nepheline pegmatites formed at high pressures in the lower crust (Ivrea Zone, southern Alps, Switzerland)
  12. Tourmaline as a petrogenetic monitor of the origin and evolution of the Berry-Havey pegmatite (Maine, U.S.A.)
  13. Applications of Hirshfeld surfaces to mineralogy: An example of alumohydrocalcite, and the classification of the dundasite group minerals
  14. Optical absorption anisotropy of high-density, wide-gap, high-hardness SiO2 polymorphs seifertite, stishovite, and coesite
  15. The system Na2CO3-FeCO3 at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3
  16. Chlorine-hydroxyl diffusion in pargasitic amphibole
  17. The use of cation-cation and anion-anion bonds to augment the bond-valence model
  18. AIM analysis and the form of the bond-valence equation
  19. Atomistic simulation on mixing thermodynamics of calcite-smithsonite solid solutions
  20. Combined geochemistry and geochronology constrains coupled subduction of oceanic and continental crust in the Huwan shear zone, central China
  21. Near-infrared investigation of folding sepiolite
  22. First-principles study of sulfur isotope fractionation in pyrite-type disulfides
  23. Tetrataenite in terrestrial rock
  24. Thermo-compression of pyrope-grossular garnet solid solutions: Non-linear compositional dependence
  25. Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900–1450 °C
  26. Trace-element partitioning between plagioclase, alkali feldspar, Ti-magnetite, biotite, apatite, and evolved potassic liquids from Campi Flegrei (Southern Italy)
  27. Synthetic and natural ammonium-bearing tourmaline
  28. Anhydrite stability and the effect of Ca on the behavior of sulfur in felsic magmas
  29. Nuragheite, Th(MoO4)2·H2O, The Second Natural Thorium Molybdate And Its Relationships To Ichnusaite And Synthetic Th(MoO4)2†
  30. Structural Effects On Incorporated Water In Carbonated Apatites
  31. New Constraints On Electron-Beam Induced Halogen Migration In Apatite
  32. Origin Of The Lunar Highlands Mg-Suite: An Integrated Petrology, Geochemistry, Chronology, And Remote Sensing Perspective
  33. An In Situ High-Pressure Nmr Study Of Sodium Coordination Environment Compressibility In Albite Glass
  34. Hydrothermal Synthesis And Crystal Structure Of Also4(Oh): A Titanite-Group Member
  35. New Mineral Names
  36. Book Review: Thermal Remote Sensing Of Active Volcanoes: A User’S Manual
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