High-pressure, high-temperature phase stability of iron-poor dolomite and the structures of dolomite-IIIc and dolomite-V

Binck, Jannes; Chariton, Stella; Stękiel, Michał; Bayarjargal, Lkhamsuren; Morgenroth, Wolfgang; Milman, Victor; Dubrovinsky, Leonid; Winkler, Björn

doi:10.1016/j.pepi.2019.106403

Cited by 22 publications

(60 citation statements)

References 47 publications

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“…DOI: https://doi.org/10.2138/am-2021-7872. http://www.minsocam.org/ intensities of Raman bands for carbonates are very well reproduced and predicted with this approach (Nguyen-Thanh et al, 2016;Biedermann et al, 2017;Bayarjargal et al, 2018;Binck et al, 2020a;Binck et al 2020b). Reaction enthalpies were computed in the athermal limit by comparing the sum of the enthalpies of the reactants to those of the products at prescribed pressures.…”

Section: Density Functional Theorymentioning

confidence: 83%

“…DOI: https://doi.org/10.2138/am-2021-7872. http://www.minsocam.org/ CaMg(CO 3 ) (Binck et al, 2020a;Merlini et al, 2017), may be stable at the p, T conditions of the Earth's mantle, while displaying a variety of different high p, T structures (e.g. Binck et al, 2020a;Cerantola et al, 2017;Chariton et al, 2020;Merlini et al, 2017;Gavryushkin et al, 2017;Ono et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…http://www.minsocam.org/ CaMg(CO 3 ) (Binck et al, 2020a;Merlini et al, 2017), may be stable at the p, T conditions of the Earth's mantle, while displaying a variety of different high p, T structures (e.g. Binck et al, 2020a;Cerantola et al, 2017;Chariton et al, 2020;Merlini et al, 2017;Gavryushkin et al, 2017;Ono et al, 2007). It has been proposed that carbonates in contact with mantle silicates and metals in the deep Earth are reduced and, depending on the stage of reduction, form metal carbides, or diamonds (Palyanov et al, 2013;Rohrbach et al, 2011;Stagno et al, 2012Stagno et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle

Binck

Laniel

Bayarjargal

et al. 2022

American Mineralogist

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We show, by single crystal diffraction studies in laser-heated diamond anvil cells, that Ca 2 CO orthocarbonate, which contains CO 4 4tetrahedra, can be formed already at ~20 GPa at ~1830 K, i.e. at much lower pressures than other carbonates with sp 3-hybridized carbon. Ca 2 CO can also be formed at ~89 GPa and ~2500 K. This very broad p, T-range suggests the possible existence of Ca 2 CO 4 in the Earth's transition zone and in most of the lower mantle. Raman spectroscopy shows the typical bands associated with tetrahedral CO 4 4-groups. DFT-theory based calculations reproduce the experimental Raman spectra and indicate that at least in the athermal limit the phase assemblage of Ca 2 CO 4 + 2SiO 2 is more stable than 2CaSiO 3 + CO 2 at high pressures.

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Section: Density Functional Theorymentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle

Binck

Laniel

Bayarjargal

et al. 2022

American Mineralogist

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“…Calcite-Ⅲb) and dolomite (e.g., Dolomite-Ⅰb, Dolomite-Ⅲb, Dolomite-Ⅲc) due to the distorted CaO 6 and/or MgO 6 octahedra (Binck et al, 2019;Efthimiopoulos et al, 2017;Merlini et al, 2014;Pippinger et al, 2015). More interestingly, the occurrence of the distortion phase Calcite-Ⅲb was evidenced in sediments in nature from the surface in quaternary loess deposits in Central Asia (Schaebitz et al, 2015).…”

Section: Discussionmentioning

confidence: 94%

“…With the emergence of the splitting of v 4 mode at about 50 GPa, the MgCO 3 -Ⅰb phase would undergo further distortion. Consequently, it would be denoted as the MgCO 3 -Ⅰc phase (magnesite-Ⅰc) between 5075 GPa based on the similar phenomena observed in dolomite and calcite at high pressures (Binck et al, 2019;Efthimiopoulos et al, 2017;Pippinger et al, 2015).…”

Section: Lattice Distortion Of Mgco 3 At High Pressurementioning

confidence: 99%

Raman signatures of the distortion and stability of MgCO3 to 75 GPa

Zhao

et al. 2021

American Mineralogist

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Knowledge of the stability of carbonate minerals at high pressure is essential to better understand carbon cycle deep inside the Earth. The evolution of Raman modes of carbonates with increasing pressure can straightforwardly illustrate lattice softening and stiffening. Here, we reported Raman modes of natural magnesite MgCO 3 up to 75 GPa at room temperature using helium as a pressure-transmitting medium (PTM). Our Raman spectra of MgCO 3 showed the splitting of T and ν 4 modes initiates at approximate 30 and 50 GPa, respectively, which could be associated with its lattice distortions The MgCO 3 structure was referred to as MgCO 3-Ⅰb at 30-50 GPa and as MgCO 3-Ⅰc at 50-75 GPa. Intriguingly, at 75.4 GPa some new vibrational signatures appeared around 250-350 and ~800 cm-1. The emergence of those Raman bands in MgCO 3 under relatively hydrostatic conditions is consistent with the onset pressure of structural transition to MgCO 3-Ⅱ reported by theoretical predictions and high pressure-temperature experiments. This study suggests that hydrostatic conditions may significantly affect the structural evolution of MgCO 3 with increasing pressure, which shall be considered for modeling the carbon cycle in the Earth's lower mantle.

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Effect of Iron on the Stability of Rhodochrosite at the Topmost Lower Mantle Conditions

Zhai,

Qin,

Huang

et al. 2024

J. Earth Sci.

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High-pressure, high-temperature phase stability of iron-poor dolomite and the structures of dolomite-IIIc and dolomite-V

Cited by 22 publications

References 47 publications

Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle

Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle

Raman signatures of the distortion and stability of MgCO3 to 75 GPa

Effect of Iron on the Stability of Rhodochrosite at the Topmost Lower Mantle Conditions

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