Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900-1450  C

Shatskiy, Anton; Borzdov, Yuri M.; Litasov, Konstantin D.; Sharygin, Igor S.; Palyanov, Yuri N.; Ohtani, Eiji

doi:10.2138/am-2015-5001

Cited by 30 publications

(32 citation statements)

References 89 publications

(104 reference statements)

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“…The results indicate that the melting temperature of K 2 CO 3 is 1220 ± 20°C at 4.0 ± 0.5 GPa, 1195 ± 15°C at 5.0 ± 0.5 GPa, 1290 ± 10°C at 9.0 ± 0.5 GPa, and 1313 ± 10°C at 11.5 ± 0.5 GPa. Shatskiy et al (2015) reported that the melting temperature of K 2 CO 3 at 6 GPa is about 1425°C, which is about 225°C higher than those at 5 GPa determined in this study. Thus far, the difference has been difficult to explain.…”

Section: Resultscontrasting

confidence: 69%

“…Thus far, the difference has been difficult to explain. One possible reason is that Shatskiy et al (2015) determined the melting of K 2 CO 3 from an image. In such a case, overestimation of the melting temperature is easy because of the unobvious difference between the separate melt and solid of K 2 CO 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The melting curves of CaCO 3 (Irving and Wyllie, 1975;Suito et al, 2001), MgCO 3 (Irving and Wyllie, 1975), FeCO 3 (Tao et al, 2013, and K 2 CO 3 (Shatskiy et al, 2015; this study) combined with typical subduction paths are given in Figure 5. This figure indicates that K 2 CO 3 has a relatively low melting temperature compared with other common carbonates and that its melting curve is lower than the mantle geotherm at pressures higher than 9.0 GPa.…”

Section: Melting Of Carbonates At High Pressurementioning

confidence: 98%

See 2 more Smart Citations

The K2CO3 fusion curve revisited: New experiments at pressures up to 12 GPa

Wang

Liu

Inoue

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The melting temperatures of K 2 CO 3 were experimentally determined to be 1220 ± 20°C (4.0 ± 0.5 GPa), 1290 ± 10°C (9.0 ± 0.5 GPa), and 1313 ± 10°C (11.5 ± 0.5 GPa) in a 2000 ton split-sphere apparatus and 1195 ± 15°C (5.0 ± 0.5 GPa) in a 1000 ton uniaxial split-cylinder apparatus. The fusion curves of K 2 CO 3 were calculated up to~12.0 GPa for various K 0 ′ (pressure dependence of bulk modulus) values of the liquid, according to the thermodynamic properties for crystalline and liquid K 2 CO 3 . On the basis of these experimental results and fusion curves of K 2 CO 3 , the K 0 ′ for liquid K 2 CO 3 is constrained to be~14.4 ± 1.1 at pressures lower than 5.0 GPa in a third-order Birch-Murnaghan equation of state (EOS). However, the results at pressures above 9.0 GPa deviate from this trend, which suggests a possible phase transformation in either the crystalline or liquid phase of K 2 CO 3 between 5.0 and 9.0 GPa. Determination of liquid K 0 ′ allows the density of K 2 CO 3 liquid to be calculated to high pressure. In comparison with other common carbonates, K 2 CO 3 is shown to have the lowest melting temperature.

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Section: Resultscontrasting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Melting Of Carbonates At High Pressurementioning

confidence: 98%

See 1 more Smart Citation

The K2CO3 fusion curve revisited: New experiments at pressures up to 12 GPa

Wang

Liu

Inoue

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…37 (Shatskiy et al, 2014), Na2CO3 -FeCO3 (Shatskiy et al, 2015a), and K2CO3 -CaCO3 (Shatskiy et al, 2015b) binaries at 6 GPa, in addition to the study of Buob et al (2006) on the MgCO3 -CaCO3 binary at 6 GPa.…”

Section: Accepted Manuscriptmentioning

confidence: 89%

Melting in the mantle in the presence of carbon: Review of experiments and discussion on the origin of carbonatites

2015

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“…The EDS spectra were optimized for the quantification using standard XPP procedure included in the INCA Energy 450 software. Calibrated EDS spectra from the used device were reported to be of the same quality as wavelength dispersive analysis in many recent works …”

Section: Methodsmentioning

confidence: 99%

Raman spectroscopy of various phosphate minerals and occurrence of tuite in the Elga IIE iron meteorite

Litasov

Podgornykh

2017

J Raman Spectroscopy

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The Raman spectra of phosphate minerals: apatite, merrillite, panethite, brianite, czochralskiite, maricite, new phosphate with composition of Na2Fe(Mg,Ca)(PO4)2 and high‐pressure phase tuite from the Elga IIE iron meteorite are characterized. Panethite, brianite, czochralskiite and new Na‐Fe phosphate were described for the first time. The basic features of all studied phosphates include strong ν1 symmetric stretching mode of PO43− ions at 950–990 cm−1, antisymmetric ν3 vibrations in the 1000–1175 cm−1 region and weak bands in the 400–500 cm−1 region, which correspond to ν2 bending mode and in the 550–640 cm−1 region, related to ν4 bending mode. Weak bands at less than 300 cm−1 represent lattice modes. Most of the studied phosphates have three non‐equivalent positions of phosphorus atoms in the crystal structures and can be derived from glaserite, K3Na(SO4)2, arrangement. Two or three of non‐equivalent [PO4] tetrahedra typically correspond to two or three strong bands in the region of ν1 vibrations. High‐pressure mineral tuite has similar composition and was formed after merrillite. P‐O vibrations in equivalent [PO4] tetrahedra produce major Raman band of tuite at 972 cm−1. The Elga parent‐body experienced a shock pressure of at least 12–15 GPa according to minimum pressures of tuite formation in the static high‐pressure experiments. This is the first finding of tuite in iron meteorites and the only second finding of high‐pressure mineral in them. Copyright © 2017 John Wiley & Sons, Ltd.

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Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900-1450 C

Abstract: Phase relations in the system K 2 CO 3 -CaCO 3 have been studied in the compositional range, X(K 2 CO 3 ), from 100 to 10 mol%, at 6.0 GPa and 900-1450 °C. At 900-950 °C, the system has three intermediate compounds:

Cited by 30 publications

References 89 publications

The K<sub>2</sub>CO<sub>3</sub> fusion curve revisited: New experiments at pressures up to 12 GPa

The K<sub>2</sub>CO<sub>3</sub> fusion curve revisited: New experiments at pressures up to 12 GPa

Melting in the mantle in the presence of carbon: Review of experiments and discussion on the origin of carbonatites

Raman spectroscopy of various phosphate minerals and occurrence of tuite in the Elga IIE iron meteorite

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