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Melting relations in the system CaCO3-MgCO3 at 6 GPa

  • Jan Müller EMAIL logo , Monika Koch-Müller , Dieter Rhede , Franziska D.H. Wilke and Richard Wirth
Published/Copyright: November 30, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 12

Abstract

To define the liquidus and solidus of the system CaCO3-MgCO, rotating multi-anvil experiments were performed at 6 GPa in the temperature range 1300 to 1800 °C under anhydrous conditions. Additionally, experiments under hydrous conditions were performed in the Mg-rich part of the phase diagram. To determine the melting point of the end-member magnesite at 6 GPa falling sphere/body experiments were performed. The run products were analyzed using electron microprobe, Raman spectroscopy, and X-ray diffraction. Some of the run products were investigated by transmission electron microscopy (TEM).

Previous studies report tremendous quenching problems in melting experiments of carbonates, as the primary grown carbonates could not be distinguished from the quenched melt. With the help of rotating multi-anvil experiments the primary grown crystals could be separated from the melt phase and the compositions of both phases could be analyzed by electron microprobe. Compared with the results of static experiments the corresponding phase diagram under anhydrous conditions is significantly different. The anhydrous melting point of MgCO3 at 6 GPa could be located between 1750 and 1800 °C. Under hydrous conditions liquidus and solidus moved to lower temperatures compared to anhydrous conditions and the melting point of hydrous MgCO3 at 6 GPa is located between 1700 and 1750 °C.

Keywords: Carbonate; melt; magnesite; multi-anvil press

Acknowledgments

We thank Andreas Ebert and Reiner Schulz for the technical support during the experiments and Vanessa Helpa for providing the magnesite sample. This work is partly supported by the DFG funded research group FOR2125 CarboPaT (KO1260/16).

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Received: 2016-4-27
Accepted: 2017-7-28
Published Online: 2017-11-30
Published in Print: 2017-12-20

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2017-5831
Keywords for this article
Carbonate; melt; magnesite; multi-anvil press

Articles in the same Issue

  1. Special Collection: Rates and Depths of Magma Ascent on Earth
  2. Multiple-reaction geobarometry for olivine-bearing igneous rocks
  3. Special Collection: Rates and Depths of Magma Ascent on Earth
  4. Eruption style and crystal size distributions: Crystallization of groundmass nanolites in the 2011 Shinmoedake eruption
  5. Special Collection: Nanominerals and Mineral Nanoparticles
  6. The nanocrystalline structure of basaluminite, an aluminum hydroxide sulfate from acid mine drainage
  8. Trace element zoning in hornblende: Tracking and modeling the crystallization of a calc-alkaline arc pluton
  10. Toward the wider application of 29Si NMR spectroscopy to paramagnetic transition metal silicate minerals: Copper(II) silicates
  12. Extraterrestrial formation of oldhamite and portlandite through thermal metamorphism of calcite in the Sutter’s Mill carbonaceous chondrite
  14. Age discordance and mineralogy
  16. Melting relations in the system CaCO3-MgCO3 at 6 GPa
  18. Electrical conductivity of mudstone (before and after dehydration at high P-T) and a test of high conductivity layers in the crust
  20. The solubility of CePO4 monazite and YPO4 xenotime in KCl-H2O fluids at 800 °C and 1.0 GPa: Implications for REE transport in high-grade crustal fluids
  22. Mineralogical, geochemical, and textural indicators of crystal accumulation in the Adamello Batholith (Northern Italy)
  24. Stability field of the Cl-rich scapolite marialite
  26. The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry
  28. An experimental approach to quantify the effect of tetrahedral boron in tourmaline on the boron isotope fractionation between tourmaline and fluid
  30. A qualitative and quantitative investigation of partitioning and local structure of arsenate in barite lattice during coprecipitation of barium, sulfate, and arsenate
  32. The origin of needle-like rutile inclusions in natural gem corundum: A combined EPMA, LA-ICP-MS, and nano-SIMS investigation—Discussion
  34. The origin of needle-like rutile inclusions in natural gem corundum: A combined EMPA, LA-ICP-MS, and nano-SIMS investigation—Reply
  36. New Mineral Names
  37. Errata
  38. Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa
  39. Errata
  40. A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
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