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Revision of the CaMgSi2O6-CO2 P-T phase diagram at 3–6 GPa

  • Anton Shatskiy , Yulia G. Vinogradova , Anton V. Arefiev and Konstantin D. Litasov ORCID logo
Published/Copyright: November 30, 2023
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Abstract

We reexamined the phase relationships in the system diopside-CO2 in the range of 3–6 GPa and 850–1500 °C in multi-anvil experiments, including reversal ones lasting up to 169 h. The reaction CaMgSi2O6 (clinopyroxene) + 2CO2 (fluid) = 2SiO2 (quartz/coesite) + CaMg(CO3)2 (dolomite) passes through 3 GPa/950 °C with a slope of 6 MPa/°C and terminates at an invariant point near 4.5 GPa/1200 °C, where carbonate liquid coexists with clinopyroxene, coesite, dolomite, and CO2 fluid. The newly determined boundary has the equation P(GPa) = 0.006 × T(°C) – 2.7. As temperature increases to 1250 °C at 4.5 GPa, liquid, dolomite, and coesite disappear, and clinopyroxene coexists with CO2 fluid. As pressure increases to 6 GPa, the solidus temperature increases to 1300 °C revealing a slope of 15 MPa/°C. At 4.5 and 6 GPa, solidus melts contain about 1 wt% SiO2. As temperature increases to 1400 and 1500 °C at 6 GPa, the silica contents in the carbonate melt increase to 6 and 13 wt%, respectively. Our data, combined with that of Luth (2006), indicate that above 4.5 GPa the liquidus reaction involving clinopyroxene and CO2 sweeps down through 350 °C via a pressure maximum near 5.3 GPa to meet the invariant point at 4.5 GPa. The shape of the diopside-CO2 solidus resembles that of lherzolite-CO2 (Wyllie and Huang 1975a) but shifted by 2 GPa to higher pressure. Thus, the deep depression along the solidi in the system CaO-MgO-SiO2-CO2 is a fundamental feature of both ultramafic and mafic assemblages at depths of 70–150 km.

Acknowledgments and funding

We are grateful to the anonymous reviewer and Oleg Safonov for reviews and valuable comments, which improved the manuscript. This work is financially supported by Russian Science Foundation (project no. 21-17-00024).

References cited

Brey, G.P. and Kohler, T. (1990) Geothermobarometry in four-phase Lherzolites II. New thermobarometers, and practical assessment of existing thermobarometers. Journal of Petrology, 31, 1353–1378, https://doi.org/10.1093/petrology/31.6.1353Search in Google Scholar

Brey, G., Brice, W.R., Ellis, D.J., Green, D.H., Harris, K.L., and Ryabchikov, I.D. (1983) Pyroxene-carbonate reactions in the upper mantle. Earth and Planetary Science Letters, 62, 63–74, https://doi.org/10.1016/0012-821X(83)90071-7Search in Google Scholar

Buob, A., Luth, R.W., Schmidt, M.W., and Ulmer, P. (2006) Experiments on CaCO3-MgCO3 solid solutions at high pressure and temperature. American Mineralogist, 91, 435–440, https://doi.org/10.2138/am.2006.1910Search in Google Scholar

Dalton, J.A. and Presnall, D.C. (1998) Carbonatitic melts along the solidus of model lherzolite in the system CaO-MgO-Al2O3-SiO2-CO2 from 3 to 7 GPa. Contributions to Mineralogy and Petrology, 131, 123–135, https://doi.org/10.1007/s004100050383Search in Google Scholar

Day, H.W. (2012) A revised diamond-graphite transition curve. American Mineralogist, 97, 52–62, https://doi.org/10.2138/am.2011.3763Search in Google Scholar

Eggler, D.H. and Rosenhauer, M. (1978) Carbon dioxide in silicate melts; II, Solubilities of CO2 and H2O in CaMgSi2O6 (diopside) liquids and vapors at pressures to 40 kb. American Journal of Science, 278, 64–94, https://doi.org/10.2475/ajs.278.1.64Search in Google Scholar

Ellis, D.J. and Green, D.H. (1979) An experimental study of the effect of Ca upon garnet-clinopyroxene Fe-Mg exchange equilibria. Contributions to Mineralogy and Petrology, 71, 13–22, https://doi.org/10.1007/BF00371878Search in Google Scholar

Falloon, T. J. and Green, D.H. (1989) Solidus of carbonated fertile peridotite. Earth and Planetary Science Letters, 94, 364–370, https://doi.org/10.1016/0012-821X(89)90153-2Search in Google Scholar

Hammouda, T. (2003) High-pressure melting of carbonated eclogite and experimental constraints on carbon recycling and storage in the mantle. Earth and Planetary Science Letters, 214, 357–368, https://doi.org/10.1016/S0012-821X(03)00361-3Search in Google Scholar

Hasterok, D. and Chapman, D.S. (2011) Heat production and geotherms for the continental lithosphere. Earth and Planetary Science Letters, 307, 59–70, https://doi.org/10.1016/j.epsl.2011.04.034Search in Google Scholar

Hemingway, B.S., Bohlen, S.R., Hankins, W.B., Westrum, E.F., and Kuskov, O.L. (1998) Heat capacity and thermodynamic properties for coesite and jadeite, reexamination of the quartz-coesite equilibrium boundary. American Mineralogist, 83, 409–418, https://doi.org/10.2138/am-1998-5-601Search in Google Scholar

Hernlund, J., Leinenweber, K., Locke, D., and Tyburczy, J.A. (2006) A numerical model for steady-state temperature distributions in solid-medium high-pressure cell assemblies. American Mineralogist, 91, 295–305, https://doi.org/10.2138/am.2006.1938Search in Google Scholar

Katsura, T. (2022) A revised adiabatic temperature profile for the mantle. Journal of Geophysical Research: Solid Earth, 127, e2021JB023562, https://doi.org/10.1029/2021JB023562Search in Google Scholar

Lavrent’ev, Y.G., Karmanov, N.S., and Usova, L.V. (2015) Electron probe microanalysis of minerals: Microanalyzer or scanning electron microscope? Russian Geology and Geophysics, 56, 1154–1161, https://doi.org/10.1016/j.rgg.2015.07.006Search in Google Scholar

Luth, R.W. (1995) Experimental determination of the reaction dolomite + 2 coesite = diopside + 2 CO2 to 6 GPa. Contributions to Mineralogy and Petrology, 122, 152–158, https://doi.org/10.1007/s004100050118Search in Google Scholar

Luth, R.W. (2001) Experimental determination of the reaction aragonite plus magnesite = dolomite at 5 to 9 GPa. Contributions to Mineralogy and Petrology, 141, 222–232, https://doi.org/10.1007/s004100100238Search in Google Scholar

Luth, R.W. (2006) Experimental study of the CaMgSi2O6-CO2 system at 3–8 GPa. Contributions to Mineralogy and Petrology, 151, 141–157, https://doi.org/10.1007/s00410-005-0051-6Search in Google Scholar

Müller, J., Koch-Müller, M., Rhede, D., Wilke, F.D., and Wirth, R. (2017) Melting relations in the system CaCO3-MgCO3 at 6 GPa. American Mineralogist, 102, 2440–2449.Search in Google Scholar

Newbury, D.E. and Ritchie, N.W.M. (2015) Performing elemental microanalysis with high accuracy and high precision by scanning electron microscopy/silicon drift detector energy-dispersive X-ray spectrometry (SEM/SDD-EDS). Journal of Materials Science, 50, 493–518, https://doi.org/10.1007/s10853-014-8685-2Search in Google Scholar

Newton, R.C. and Sharp, W.E. (1975) Stability of forsterite+CO2 and its bearing on the role of CO2 in the mantle. Earth and Planetary Science Letters, 26, 239–244, https://doi.org/10.1016/0012-821X(75)90091-6Search in Google Scholar

Orlov, Y.L. (1977) The Mineralogy of the Diamond, 235 p. Translated from the Russian edition (Moscow, 1973). Wiley.Search in Google Scholar

Podborodnikov, I.V., Shatskiy, A., Arefiev, A.V., Bekhtenova, A., and Litasov, K.D. (2019) New data on the system Na2CO3-CaCO3-MgCO3 at 6 GPa with implications to the composition and stability of carbonatite melts at the base of continental lithosphere. Chemical Geology, 515, 50–60, https://doi.org/10.1016/j.chemgeo.2019.03.027Search in Google Scholar

Ragozin, A.L., Shatsky, V.S., Rylov, G.M., and Goryainov, S.V. (2002) Coesite inclusions in rounded diamonds from placers of the Northeastern Siberian Platform. Doklady Earth Sciences, 384, 385–389.Search in Google Scholar

Ragozin, A.L., Shatskii, V.S., and Zedgenizov, D.A. (2009) New data on the growth environment of diamonds of the variety V from placers of the Northeastern Siberian platform. Doklady Earth Sciences, 425, 436–440, https://doi.org/10.1134/S1028334X09030192Search in Google Scholar

Schrauder, M. and Navon, O. (1993) Solid carbon dioxide in natural diamond. Nature, 365, 42–44, https://doi.org/10.1038/365042a0Search in Google Scholar

Shatskiy, A., Sharygin, I.S., Gavryushkin, P.N., Litasov, K.D., Borzdov, Y.M., Shcherbakova, A.V., Higo, Y., Funakoshi, K.-i., Palyanov, Y.N., and Ohtani, E. (2013) The system K2CO3-MgCO3 at 6 GPa and 900–1450 °C. American Mineralogist, 98, 1593–1603, https://doi.org/10.2138/am.2013.4407Search in Google Scholar

Shatskiy, A., Podborodnikov, I.V., Arefiev, A.V., Litasov, K.D., Chanyshev, A.D., Sharygin, I.S., Karmanov, N. S., and Ohtani, E. (2017) Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa: Implications for partial melting of carbonated lherzolite. American Mineralogist, 102, 1934–1946, https://doi.org/10.2138/am-2017-6048Search in Google Scholar

Shatskiy, A., Podborodnikov, I.V., Arefiev, A.V., Minin, D.A., Chanyshev, A.D., and Litasov, K.D. (2018) Revision of the CaCO3-MgCO3 phase diagram at 3 and 6 GPa. American Mineralogist, 103, 441–452, https://doi.org/10.2138/am-2018-6277Search in Google Scholar

Shatskiy, A., Arefiev, A.V., Podborodnikov, I.V., and Litasov, K.D. (2019) Origin of K-rich diamond-forming immiscible melts and CO2 fluid via partial melting of carbonated pelites at a depth of 180–200 km. Gondwana Research, 75, 154–171, https://doi.org/10.1016/j.gr.2019.05.004Search in Google Scholar

Shatskiy, A., Podborodnikov, I.V., Arefiev, A.V., Bekhtenova, A., Vinogradova, Y.G., Stepanov, K.M., and Litasov, K.D. (2021) Pyroxene-carbonate reactions in the CaMgSi2O6 ± NaAlSi2O6 + MgCO3 ± Na2CO3 ± K2CO3 system at 3–6 GPa: Implications for partial melting of carbonated peridotite. Contributions to Mineralogy and Petrology, 176, 34, https://doi.org/10.1007/s00410-021-01790-9Search in Google Scholar

Shatskiy, A., Bekhtenova, A., Arefiev, A.V., Podborodnikov, I.V., Vinogradova, Y.G., Rezvukhin, D.I., and Litasov, K.D. (2022) Solidus and melting of carbonated phlogopite peridotite at 3–6.5 GPa: Implications for mantle metasomatism. Gondwana Research, 101, 156–174, https://doi.org/10.1016/j.gr.2021.07.023Search in Google Scholar

Sokol, A.G., Pal’yanov, Y.N., Borzdov, Y.M., Khokhryakov, A.F., and Sobolev, N.V. (1998) Crystallization of diamond from Na2CO3 melt. Doklady Akademii Nauk, 361, 388–391.Search in Google Scholar

Tappe, S., Foley, S.F., Stracke, A., Romer, R.L., Kjarsgaard, B.A., Heaman, L.M., and Joyce, N. (2007) Craton reactivation on the Labrador Sea margins: 40Ar/39Ar age and Sr-Nd-Hf-Pb isotope constraints from alkaline and carbonatite intrusives. Earth and Planetary Science Letters, 256, 433–454, https://doi.org/10.1016/j.epsl.2007.01.036Search in Google Scholar

Taylor, L.A. and Neal, C.R. (1989) Eclogites with oceanic crustal and mantle signatures from the Bellsbank kimberlite, South Africa, Part I: Mineralogy, petrography, and whole rock chemistry. The Journal of Geology, 97, 551–567, https://doi.org/10.1086/629334Search in Google Scholar

Tomilenko, A.A., Ragozin, A.L., Shatskii, V.S., and Shebanin, A.P. (2001) Variation in the fluid phase composition in the process of natural diamond crystallization. Doklady Earth Sciences, 379, 571–574.Search in Google Scholar

Vinogradova, Y.G., Shatskiy, A.F., and Litasov, K.D. (2021) Thermodynamic analysis of the reactions of CO2-fluid with garnets and clinopyroxenes at 3–6 GPa. Geochemistry International, 59, 851–857, https://doi.org/10.1134/S0016702921080103Search in Google Scholar

Wallace, M.E. and Green, D.H. (1988) An experimental determination of primary carbonatite magma composition. Nature, 335, 343–346, https://doi.org/10.1038/335343a0Search in Google Scholar

Wyllie, P.J. and Huang, W. (1975a) Peridotite, kimberlite, and carbonatite explained in the system CaO-MgO-SiO2-CO2. Geology, 3, 621–624, https://doi.org/10.1130/0091-7613(1975)3<621:PKACEI>2.0.CO;2Search in Google Scholar

Wyllie, P.J. and Huang, W. (1975b) Influence of mantle CO2 in generation of carbonatites and kimberlites. Nature, 257, 297–299, https://doi.org/10.1038/257297a0Search in Google Scholar

Wyllie, P., Huang, W.-L., Otto, J., and Byrnes, A. (1983) Carbonation of peridotites and decarbonation of siliceous dolomites represented in the system CaO-MgO-SiO2-CO2 to 30 kbar. Tectonophysics, 100, 359–388, https://doi.org/10.1016/0040-1951(83)90194-4Search in Google Scholar

Xu, M., Jing, Z., Bajgain, S.K., Mookherjee, M., Van Orman, J.A., Yu, T., and Wang, Y. (2020) High-pressure elastic properties of dolomite melt supporting carbonate-induced melting in deep upper mantle. Proceedings of the National Academy of Sciences of the United States of America, 117, 18285–18291, https://doi.org/10.1073/pnas.2004347117Search in Google Scholar

Received: 2022-05-11
Accepted: 2022-11-09
Published Online: 2023-11-30
Published in Print: 2023-12-15

© 2023 by Mineralogical Society of America

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