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Letter. High-pressure phase transitions in Ca-Mn carbonates (Ca,Mn)CO3 studied by Raman spectroscopy
-
Weiguang Shi
and
Sean R. Shieh
Published/Copyright:
April 2, 2015
Abstract
The influence of Mn content on the stability of the high-pressure CaCO3 phases CaCO3-I, CaCO3- II, and CaCO3-III at 300 K has been investigated up to 40 mol% MnCO3 using Raman spectroscopy recorded in situ with a diamond-anvil cell at pressures up to 14 GPa. Beyond about 5 mol% MnCO3, there is a progressive linear upward shift in the pressure of the CaCO3-I → CaCO3-II and CaCO3-II → CaCO3-III transitions, and expansion of the field of the CaCO3-II phase, with increase in MnCO3 content. The shifts in transition pressure are 0.19 GPa/mol% for I → II and 0.26 GPa/mol% for II → III over the 5 to 40 mol% MnCO3 composition interval, results fully consistent with elevation of transition pressure by the introduction of a smaller cation. However, minor and trace amounts of Mn appear to have a relatively insignificant influence on the pressure of these transitions.
Keywords: Calcite; rhodochrosite; solid solution; high pressure; Raman spectroscopy; diamondanvil cell
Received: 2012-1-23
Accepted: 2012-2-19
Published Online: 2015-4-2
Published in Print: 2012-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Calcite;
rhodochrosite;
solid solution;
high pressure;
Raman spectroscopy;
diamondanvil cell
Articles in the same Issue
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- Wassonite: A new titanium monosulfide mineral in the Yamato 691 enstatite chondrite
- Determination of Mn valence states in mixed-valent manganates by XANES spectroscopy
- The morphology of the reaction front of the dissolutionprecipitation reaction rutile + wollastonite = titanite in time series experiments at 600 °C/400 MPa
- Precipitation of rutile and ilmenite needles in garnet: Implications for extreme metamorphic conditions in the Acadian Orogen, U.S.A.
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