High-pressure compressibility and thermal expansion of aragonite

Palaich, S.; Heffern, Robert A.; Hanfland, Michael; Lausi, Andrea; Kavner, A.; Manning, Craig E.; Merlini, Marco

doi:10.2138/am-2016-5528

Cited by 33 publications

(24 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The volume equation of state of calcite V is substantially unknown at high temperature; we therefore collected in-situ X-ray diffraction on CaCO 3 in order to determine thermal expansivity. Thermal expansion of calcite results increases from 4.1E-5 m/°C determined in the 25-500 °C interval (Merlini et al, 2016) up to 1.34E-4 m/°C in the highest temperature range investigated here. As a consequence G 0 and S 0 of calcite V were fitted adopting V 0 at 3.60 J/bar, and fitting α 0 constrained at values higher than 1.0E-4 m/°C.…”

Section: Retrieving Thermodynamic Data For Calcite V and Liquid Cacomentioning

confidence: 61%

“…High temperature diffraction on CaCO 3 powder was performed at MCX beamline at Elettra synchrotron facility, using the high temperature furnace available and the standard experimental setup (Riello et al 2013;Merlini et al, 2016). In-situ diffraction were collected in the temperature interval 25-1000°C, with sample contained in a quartz capillary connected to a CO 2 gas line at 1.5 bar to prevent decarbonation during the experiment (see the supplementary data B for details).…”

Section: Experimental and Analytical Techniquesmentioning

confidence: 99%

“…The thermodynamic analysis was performed by adopting S 0 = 87.99 J/K of aragonite from Staveley and Linford (1969), later reported in Robie and Hemingway (1995), and G 0 of aragonite averaging data from Robie andHemingway (1995), andKönigsberber et al (1999). V 0 , α , K and K' of aragonite from the data presented in Palaich et al (2016) re-fitted with eq. (6).…”

Section: Retrieving Thermodynamic Data For Calcite V and Liquid Cacomentioning

confidence: 99%

“…As a consequence G 0 and S 0 of calcite V were fitted adopting V 0 at 3.60 J/bar, and fitting α 0 constrained at values higher than 1.0E-4 m/°C. Bulk modulus of calcite and its derivative were derived from Merlini et al (2016). Thermodynamic properties for liquid CaCO 3 were derived assuming a fixed bulk modulus derivative (K' = 4.0) (Kang et al, 2016).…”

Section: Retrieving Thermodynamic Data For Calcite V and Liquid Cacomentioning

confidence: 99%

See 3 more Smart Citations

The stability and melting of aragonite: An experimental and thermodynamic model for carbonated eclogites in the mantle

Zhao

Schettino

Merlini

et al. 2019

Lithos

Self Cite

View full text Add to dashboard Cite

as a marker of relatively low temperature-high pressure metamorphism, and it has been widely used in reference geobarometers for so-called ultra-high pressure metamorphic rocks (Hermann et al., 2016). Nonetheless, as Ca-carbonates are stable over a very wide range of temperatures (Suito et al., 2001; Li et al., 2017; Müller et al, 2017; Shatskiy et al. 2018), up to the average mantle adiabat beneath ridges and ocean islands (Fig. 1), a large range of carbonated eclogites and pyroxenites may contain aragonite at mantle conditions, as revealed by several experimental studies (Hammouda, 2003; Kiseeva et al., 2013; Grassi and Schmidt, 2011; Brey et al., 2015). Evidence of CaCO 3bearing eclogitic assemblages have been also provided by the occurrence of inclusions of carbonates in the diamonds from Juina (Brazil), possibly originated from the lower part of the transition zone (Brenker et al., 2007), and of aragonite as inclusions in olivine phenocrysts from leucitite lava flows at Calatrava, Spain (Humphreys et al., 2010). The geochemistry of carbonatites (Woolley and Kjarsgaard, 2008) and kimberlites (Becker and Le Roex, 2006) points to the importance of components CaO and CO 2 for describing their diversity and magmatic evolution. Carbonatites are thought to be among the major metasomatic agents in the sublithospheric mantle due to their low density, low viscosity and high reactivity (Green and Wallace, 1988). Whether calcite or aragonite occur on the liquidus surface it may affect the fractionation of trace elements as aragonite was experimentally found to preferentially partition Sr with respect to calcite (Carlson, 1980), and intermediate REE with respect to Fe-Mg carbonate (Brey et al., 2015). Thermodynamic properties of CaCO 3 polymorphs, and of liquid CaCO 3 , are barely known

show abstract

Section: Retrieving Thermodynamic Data For Calcite V and Liquid Cacomentioning

confidence: 61%

Section: Experimental and Analytical Techniquesmentioning

confidence: 99%

Section: Retrieving Thermodynamic Data For Calcite V and Liquid Cacomentioning

confidence: 99%

Section: Retrieving Thermodynamic Data For Calcite V and Liquid Cacomentioning

confidence: 99%

See 2 more Smart Citations

The stability and melting of aragonite: An experimental and thermodynamic model for carbonated eclogites in the mantle

Zhao

Schettino

Merlini

et al. 2019

Lithos

Self Cite

View full text Add to dashboard Cite

show abstract

“…These values are in good agreement with those obtained from our calculations: V 0 = 268.21(1) Å 3 , B 0 = 59.98(8) GPa, and B′ 0 = 4.43(2). The compressibility of barytocalcite lies in between those of the two end-member carbonates: 67(2) GPa for CaCO 3 calcite (B′ 0 = 4) 24 , 66.5(7) GPa (B′ 0 = 5.0(1)) for CaCO 3 aragonite 25 and 48(1) GPa for BaCO 3 witherite 26 , and it is comparable to the 62.7(6) GPa of SrCO 3 strontianite 26 , 27 . Barytocalcite’s bulk modulus is slightly smaller than that of other BaCa(CO 3 ) 2 polymorph, alstonite, which is reported to have an experimental value of B 0 = 60(3) GPa 13 .…”

Section: Resultsmentioning

confidence: 82%

Phase stability and dense polymorph of the BaCa(CO3)2 barytocalcite carbonate

Chuliá-Jordán

Santamarı́a-Pérez

González‐Platas

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The double carbonate BaCa(CO3)2 holds potential as host compound for carbon in the Earth’s crust and mantle. Here, we report the crystal structure determination of a high-pressure BaCa(CO3)2 phase characterized by single-crystal X-ray diffraction. This phase, named post-barytocalcite, was obtained at 5.7 GPa and can be described by a monoclinic Pm space group. The barytocalcite to post-baritocalcite phase transition involves a significant discontinuous 1.4% decrease of the unit-cell volume, and the increase of the coordination number of 1/4 and 1/2 of the Ba and Ca atoms, respectively. High-pressure powder X-ray diffraction measurements at room- and high-temperatures using synchrotron radiation and DFT calculations yield the thermal expansion of barytocalcite and, together with single-crystal data, the compressibility and anisotropy of both the low- and high-pressure phases. The calculated enthalpy differences between different BaCa(CO3)2 polymorphs confirm that barytocalcite is the thermodynamically stable phase at ambient conditions and that it undergoes the phase transition to the experimentally observed post-barytocalcite phase. The double carbonate is significantly less stable than a mixture of the CaCO3 and BaCO3 end-members above 10 GPa. The experimental observation of the high-pressure phase up to 15 GPa and 300 ºC suggests that the decomposition into its single carbonate components is kinetically hindered.

show abstract

High-temperature Raman and FTIR study of aragonite-group carbonates

Wang

et al. 2018

Phys Chem Minerals

View full text Add to dashboard Cite

High-pressure compressibility and thermal expansion of aragonite

Cited by 33 publications

References 26 publications

The stability and melting of aragonite: An experimental and thermodynamic model for carbonated eclogites in the mantle

The stability and melting of aragonite: An experimental and thermodynamic model for carbonated eclogites in the mantle

Phase stability and dense polymorph of the BaCa(CO3)2 barytocalcite carbonate

High-temperature Raman and FTIR study of aragonite-group carbonates

Contact Info

Product

Resources

About