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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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1945-3027
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Volume 102, Issue 1

Issues

Ab initio study of the structure and stability of CaMg(CO3)2 at high pressure

Natalia V. Solomatova
  • Corresponding author
  • Division of Geological and Planetary Sciences, Caltech, Pasadena, California 91125 United States of America
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/ Paul D. Asimow
  • Division of Geological and Planetary Sciences, Caltech, Pasadena, California 91125 United States of America
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Published Online: 2017-01-03 | DOI: https://doi.org/10.2138/am-2017-5830

Abstract

Dolomite is one of the major mineral forms in which carbon is subducted into the Earth’s mantle. End-member CaMg(CO3)2 dolomite typically breaks down upon compression into two carbonates at 5–6 GPa in the temperature range of 800–1200 K (Shirasaka et al. 2002). However, high-pressure X-ray diffraction experiments have shown that dense high-pressure polymorphs of dolomite may be favored over single-cation carbonates (Santillán et al. 2003; Mao et al. 2011; Merlini et al. 2012). Here we compare calculated dolomite structures to experimentally observed phases. Using density functional theory interfaced with a genetic algorithm that predicts crystal structures (USPEX), a monoclinic phase with space group C2/c was found to have lower energy at pressures above 15 GPa than all previously reported dolomite structures. It is possible that this phase is not observed experimentally due to a large activation energy of transition from dolomite I, resulting in the observed second-order phase transition to a metastable dolomite II. Due to the complex energy landscape for candidate high-pressure dolomite structures, several structurally unique metastable polymorphs exist. We calculate the equation of state of a set of lowest-energy dolomite polymorphs with space groups P1¯, P2/c, and C2/c up to 80 GPa. Our results demonstrate a need for calculations and experiments on Fe-Mn bearing high-pressure carbonate phases to extend our understanding of Earth’s deep carbon cycle and test whether high-pressure polymorphs of double-cation carbonates represent the main reservoir for carbon storage within downwelling regions of Earth’s mantle.

Keywords: Dolomite; ab initio; global carbon cycle; lower mantle; high pressure

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About the article

Received: 2016-04-26

Accepted: 2016-08-24

Published Online: 2017-01-03

Published in Print: 2017-01-01


Citation Information: American Mineralogist, Volume 102, Issue 1, Pages 210–215, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2017-5830.

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© 2017 by Walter de Gruyter Berlin/Boston.

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