Effects of hydrostaticity on the structural stability of carbonates at lower 
mantle pressures: the case study of dolomite

Efthimiopoulos, I.; Germer, M.; Jahn, S.; Harms, Martin; Reichmann, Hans-Josef; Speziale, S.; Schade, U.; Sieber, Melanie; Koch-Müller, M.

doi:10.1080/08957959.2018.1558223

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Effects of hydrostaticity on the structural stability of carbonates at lower mantle pressures: the case study of dolomite

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Efthimiopoulos, I.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Germer, M.
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Jahn, S.
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/persons/resource/harms

Harms, Martin
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/hanni

Reichmann, Hans-Josef
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Speziale, S.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Schade, U.
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Sieber, Melanie
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/mkoch

Koch-Müller, M.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Efthimiopoulos, I., Germer, M., Jahn, S., Harms, M., Reichmann, H.-J., Speziale, S., Schade, U., Sieber, M., Koch-Müller, M. (2019): Effects of hydrostaticity on the structural stability of carbonates at lower mantle pressures: the case study of dolomite. - High Pressure Research, 39, 1, 36-49.
https://doi.org/10.1080/08957959.2018.1558223

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3751890

Abstract

We have conducted high pressure far-infrared absorbance and Raman spectroscopic investigations on a natural iron-free dolomite sample up to 40 GPa. Comparison between the present observations and literature results unraveled the effect of hydrostatic conditions on the high pressure dolomite polymorph adopted close to 40 GPa, i.e. the triclinic Dol-IIIc modification. In particular, non-hydrostatic conditions impose structural disorder at these pressures, whereas hydrostatic conditions allow the detection of an ordered Dol-IIIc vibrational response. Hence, hydrostatic conditions appear to be a key ingredient for modeling carbon subduction at lower mantle conditions. Our complementary first-principles calculations verified the far-infrared vibrational response of the ambient- and high pressure dolomite phases.