Abstract
Early in its history, Mercury underwent a magma ocean stage; its crystallization produced a primordial mantle and a flotation crust, setting the stage for early volcanism, crustal production, and thermochemical evolution. Here, we performed crystallization experiments on reduced, sulfur-rich silicate melt compositions relevant to Mercury’s magma ocean and its solidification during cooling. Our approach aims to reconstruct the primordial mantle stratigraphy by combining a fractional crystallization model with phase equilibria experiments on a suite of residual melts at 1525–1125 ℃ and 1.5–0.5 GPa under low oxygen fugacity (-3.7 to -8.4 log units below iron-wüstite equilibrium) to investigate the crystallization sequence for two potential Bulk Silicate Mercury compositions: a low-Mg/Si melt in the enstatite stability field and a high-Mg/Si melt in the forsterite stability field. Residual melts become co-saturated in enstatite and forsterite, followed by the crystallization of clinopyroxene at melt fractions F = 0.40–0.35, quartz at F = 0.28–0.24, and plagioclase at F = 0.19–0.14. We define the evolution of the mantle cumulate pile and the thickness of the refractory and fertile reservoirs based on the appearance of clinopyroxene. We propose that Mercury’s volcanic crust resulted from partial melting of the fertile mantle. Density calculations indicate that sulfur reduced the density of the silicate magma ocean, causing sulfides to become denser than the magma ocean, ultimately being stored in the mantle. We illustrate the influence of the magma ocean bulk composition ± sulfides on the storage and spatial distribution of heat-producing elements in Mercury’s interior.
References
Anzures, B. A., Parman, S. W., Milliken, R. E., Namur, O., Cartier, C., McCubbin, F. M., Vander Kaaden, K. E., Prissel, K., Iacovino, K., Lanzirotti, A., & Newville, M. (2025). An oxygen fugacity-temperature-pressure-composition model for sulfide speciation in Mercurian magmas. Geochimica et Cosmochimica Acta, 388, 61–77. https://doi.org/10.1016/j.gca.2024.11.012
Anzures, B. A., Parman, S. W., Milliken, R. E., Namur, O., Cartier, C., & Wang, S. (2020). Effect of sulfur speciation on chemical and physical properties of very reduced mercurian melts. Geochimica et Cosmochimica Acta, 286, 1–18. https://doi.org/10.1016/j.gca.2020.07.024
Baldwin, T. O., & Tompson, C. W. (1964). X-Ray Characteristic Temperatures of Some II-VI Ionic Compounds. The Journal of Chemical Physics, 41(5), 1420–1426. https://doi.org/10.1063/1.1726083
Barros, S. C. C., Demangeon, O. D. S., Alibert, Y., Leleu, A., Adibekyan, V., Lovis, C., Bossini, D., Sousa, S. G., Hara, N., Bouchy, F., Lavie, B., Rodrigues, J., da Silva, J. G., Lillo-Box, J., Pepe, F. A., Tabernero, H. M., Osorio, M. R. Z., Sozzetti, A., Mascareño, A. S., … Winn, J. N. (2022). HD 23472: a multi-planetary system with three super-Earths and two potential super-Mercuries. Astronomy & Astrophysics, 665, A154. https://doi.org/10.1051/0004-6361/202244293
Benkhoff, J., Murakami, G., Baumjohann, W., Besse, S., Bunce, E., Casale, M., Cremosese, G., Glassmeier, K.-H., Hayakawa, H., Heyner, D., Hiesinger, H., Huovelin, J., Hussmann, H., Iafolla, V., Iess, L., Kasaba, Y., Kobayashi, M., Milillo, A., Mitrofanov, I. G., … Zender, J. (2021). BepiColombo - Mission Overview and Science Goals. Space Science Reviews, 217(8), 90. https://doi.org/10.1007/s11214-021-00861-4
Berthet, S., Malavergne, V., & Righter, K. (2009). Melting of the Indarch meteorite (EH4 chondrite) at 1GPa and variable oxygen fugacity: Implications for early planetary differentiation processes. Geochimica et Cosmochimica Acta, 73(20), 6402–6420. https://doi.org/10.1016/j.gca.2009.07.030
Bertka, C. M., & Fei, Y. (1998). Density profile of an SNC model Martian interior and the moment-of-inertia factor of Mars. Earth and Planetary Science Letters, 157(1–2), 79–88. https://doi.org/10.1016/s0012-821x(98)00030-2
Bertone, S., Mazarico, E., Barker, M. K., Goossens, S., Sabaka, T. J., Neumann, G. A., & Smith, D. E. (2021). Deriving Mercury Geodetic Parameters With Altimetric Crossovers From the Mercury Laser Altimeter (MLA). Journal of Geophysical Research: Planets, 126(4). https://doi.org/10.1029/2020je006683
Beuthe, M., Charlier, B., Namur, O., Rivoldini, A., & Van Hoolst, T. (2020). Mercury’s Crustal Thickness Correlates With Lateral Variations in Mantle Melt Production. Geophysical Research Letters, 47(9). https://doi.org/10.1029/2020gl087261
Birch, F. (1947). Finite Elastic Strain of Cubic Crystals. Physical Review, 71(11), 809–824. https://doi.org/10.1103/physrev.71.809
Blundy, J., & Wood, B. (2003). Partitioning of trace elements between crystals and melts. Earth and Planetary Science Letters, 210(3–4), 383–397. https://doi.org/10.1016/s0012-821x(03)00129-8
Bottinga, Y., Richet, P., & Weill, D. F. (1983). Calculation of the density and thermal expansion coefficient of silicate liquids. Bulletin de Minéralogie, 106(1), 129–138. https://doi.org/10.3406/bulmi.1983.7675
Bottinga, Y., & Weill, D. F. (1970). Densities of liquid silicate systems calculated from partial molar volumes of oxide components. American Journal of Science, 269(2), 169–182. https://doi.org/10.2475/ajs.269.2.169
Boujibar, A., Habermann, M., Righter, K., Ross, D. K., Pando, K., Righter, M., Chidester, B. A., & Danielson, L. R. (2019). U, Th, and K partitioning between metal, silicate, and sulfide and implications for Mercury’s structure, volatile content, and radioactive heat production. American Mineralogist, 104(9), 1221–1237. https://doi.org/10.2138/am-2019-7000
Boujibar, A., Righter, K., Fontaine, E., Collinet, M., Lambart, S., Nittler, L. R., & Pando, K. M. (2025). A Pyroxenite mantle on Mercury? Experimental insights from enstatite chondrite melting at pressures up to 5 GPa. Icarus, 437, 116602. https://doi.org/10.1016/j.icarus.2025.116602
Boukaré, C. ‐E., Parman, S. W., Parmentier, E. M., & Anzures, B. A. (2019). Production and Preservation of Sulfide Layering in Mercury’s Mantle. Journal of Geophysical Research: Planets, 124(12), 3354–3372. https://doi.org/10.1029/2019je005942
Bowen, N. L. (1914). The ternary system; diopside-forsterite-silica. American Journal of Science, s4-38(225), 207–264. https://doi.org/10.2475/ajs.s4-38.225.207
Brown, S. M., & Elkins-Tanton, L. T. (2009). Compositions of Mercury’s earliest crust from magma ocean models. Earth and Planetary Science Letters, 286(3–4), 446–455. https://doi.org/10.1016/j.epsl.2009.07.010
Bunce, E. J., Martindale, A., Lindsay, S., Muinonen, K., Rothery, D. A., Pearson, J., McDonnell, I., Thomas, C., Thornhill, J., Tikkanen, T., Feldman, C., Huovelin, J., Korpela, S., Esko, E., Lehtolainen, A., Treis, J., Majewski, P., Hilchenbach, M., Väisänen, T., … Yeoman, T. (2020). The BepiColombo Mercury Imaging X-Ray Spectrometer: Science Goals, Instrument Performance and Operations. Space Science Reviews, 216(8), 126. https://doi.org/10.1007/s11214-020-00750-2
Byrne, P. K., Ostrach, L. R., Fassett, C. I., Chapman, C. R., Denevi, B. W., Evans, A. J., Klimczak, C., Banks, M. E., Head, J. W., & Solomon, S. C. (2016). Widespread effusive volcanism on Mercury likely ended by about 3.5 Ga. Geophysical Research Letters, 43(14), 7408–7416. https://doi.org/10.1002/2016gl069412
Cartier, C., Hammouda, T., Doucelance, R., Boyet, M., Devidal, J.-L., & Moine, B. (2014). Experimental study of trace element partitioning between enstatite and melt in enstatite chondrites at low oxygen fugacities and 5 GPa. Geochimica et Cosmochimica Acta, 130, 167–187. https://doi.org/10.1016/j.gca.2014.01.002
Cartier, C., Namur, O., Nittler, L. R., Weider, S. Z., Crapster-Pregont, E., Vorburger, A., Frank, E. A., & Charlier, B. (2020). No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER. Earth and Planetary Science Letters, 534, 116108. https://doi.org/10.1016/j.epsl.2020.116108
Cartier, C., & Wood, B. J. (2019). The Role of Reducing Conditions in Building Mercury. Elements, 15(1), 39–45. https://doi.org/10.2138/gselements.15.1.39
Chabot, N. L., Wollack, E. A., Klima, R. L., & Minitti, M. E. (2014). Experimental constraints on Mercury’s core composition. Earth and Planetary Science Letters, 390(0), 199–208. https://doi.org/10.1016/j.epsl.2014.01.004
Charlier, B., Grove, T. L., Namur, O., & Holtz, F. (2018). Crystallization of the lunar magma ocean and the primordial mantle-crust differentiation of the Moon. Geochimica et Cosmochimica Acta, 234, 50–69. https://doi.org/10.1016/j.gca.2018.05.006
Charlier, B., Grove, T. L., & Zuber, M. T. (2013). Phase equilibria of ultramafic compositions on Mercury and the origin of the compositional dichotomy. Earth and Planetary Science Letters, 363, 50–60. https://doi.org/10.1016/j.epsl.2012.12.021
Charlier, B., & Namur, O. (2019). The Origin and Differentiation of Planet Mercury. Elements, 15(1), 9–14. https://doi.org/10.2138/gselements.15.1.9
Chen, C. H., & Presnall, D. C. (1975). The system Mg2SiO4-SiO2 at pressures up to 25 kilobars. American Mineralogist, 60(5-6_Part_1), 398–406.
Cioria, C., Mitri, G., Connolly, J. A. D., Perrillat, J., & Saracino, F. (2024). Mantle Mineralogy of Reduced Sub‐Earths Exoplanets and Exo‐Mercuries. Journal of Geophysical Research: Planets, 129(7). https://doi.org/10.1029/2023je008234
Condamine, P., Tournier, S., Charlier, B., Médard, E., Triantafyllou, A., Dalou, C., Tissandier, L., Lequin, D., Cartier, C., Füri, E., Burnard, P. G., Demouchy, S., & Marrocchi, Y. (2022). Influence of intensive parameters and assemblies on friction evolution during piston-cylinder experiments. American Mineralogist, 107(8), 1575–1581. https://doi.org/10.2138/am-2022-7958
Corgne, A., Keshav, S., Wood, B. J., McDonough, W. F., & Fei, Y. (2008). Metal–silicate partitioning and constraints on core composition and oxygen fugacity during Earth accretion. Geochimica et Cosmochimica Acta, 72(2), 574–589. https://doi.org/10.1016/j.gca.2007.10.006
Cremonese, G., Capaccioni, F., Capria, M. T., Doressoundiram, A., Palumbo, P., Vincendon, M., Massironi, M., Debei, S., Zusi, M., Altieri, F., Amoroso, M., Aroldi, G., Baroni, M., Barucci, A., Bellucci, G., Benkhoff, J., Besse, S., Bettanini, C., Blecka, M., … Turrini, D. (2020). SIMBIO-SYS: Scientific Cameras and Spectrometer for the BepiColombo Mission. Space Science Reviews, 216(5), 75. https://doi.org/10.1007/s11214-020-00704-8
Dickinson, T. L., & McCoy, T. J. (1997). Experimental rare‐earth‐element partitioning in oldhamite: Implications for the igneous origin of aubritic oldhamite. Meteoritics & Planetary Science, 32(3), 395–412. https://doi.org/10.1111/j.1945-5100.1997.tb01283.x
Elkins-Tanton, L. T. (2012). Magma Oceans in the Inner Solar System. Annual Review of Earth and Planetary Sciences, 40(1), 113–139. https://doi.org/10.1146/annurev-earth-042711-105503
Elkins-Tanton, L. T., Burgess, S., & Yin, Q.-Z. (2011). The lunar magma ocean: Reconciling the solidification process with lunar petrology and geochronology. Earth and Planetary Science Letters, 304(3–4), 326–336. https://doi.org/10.1016/j.epsl.2011.02.004
Elkins-Tanton, L. T., Parmentier, E. M., & Hess, P. C. (2003). Magma ocean fractional crystallization and cumulate overturn in terrestrial planets: Implications for Mars. Meteoritics & Planetary Science, 38(12), 1753–1771. https://doi.org/10.1111/j.1945-5100.2003.tb00013.x
Falloon, T. J., & Green, D. H. (1988). Anhydrous Partial Melting of Peridotite from 8 to 35 kb and the Petrogenesis of MORB. Journal of Petrology, Special Volume(1), 379–414. https://doi.org/10.1093/petrology/special{_}volume.1.379
Fei, Y., Saxena, S. K., & Navrotsky, A. (1990). Internally consistent thermodynamic data and equilibrium phase relations for compounds in the system MgO‐SiO2 at high pressure and high temperature. Journal of Geophysical Research: Solid Earth, 95(B5), 6915–6928. https://doi.org/10.1029/jb095ib05p06915
Fincham, C. J. B., & Richardson, F. D. (1954). The behaviour of sulphur in silicate and aluminate melts. Proceedings of the Royal Society of London A, 223(1152), 40–62. https://doi.org/10.1098/rspa.1954.0099
Fischer, E. L., & Parman, S. W. (2025). The bulk composition and initial size of Mercury. Icarus, 439, 116664. https://doi.org/10.1016/j.icarus.2025.116664
Frondel, C. (1962). The system of mineralogy. In silica minerals: Vol. III. John Wiley.
Genova, A., Goossens, S., Mazarico, E., Lemoine, F. G., Neumann, G. A., Kuang, W., Sabaka, T. J., Hauck, S. A., Smith, D. E., Solomon, S. C., & Zuber, M. T. (2019). Geodetic Evidence That Mercury Has A Solid Inner Core. Geophysical Research Letters, 46(7), 3625–3633. https://doi.org/10.1029/2018gl081135
Ghiorso, M. S. (2004). An equation of state for silicate melts. I. Formulation of a general model. American Journal of Science, 304(8–9), 637–678. https://doi.org/10.2475/ajs.304.8-9.637
Goossens, S., Renaud, J. P., Henning, W. G., Mazarico, E., Bertone, S., & Genova, A. (2022). Evaluation of Recent Measurements of Mercury’s Moments of Inertia and Tides Using a Comprehensive Markov Chain Monte Carlo Method. The Planetary Science Journal, 3(2), 37. https://doi.org/10.3847/psj/ac4bb8
Gu, T., Stagno, V., & Fei, Y. (2019). Partition coefficient of phosphorus between liquid metal and silicate melt with implications for the Martian magma ocean. Physics of the Earth and Planetary Interiors, 295, 106298. https://doi.org/10.1016/j.pepi.2019.106298
Guillot, B., & Sator, N. (2007). A computer simulation study of natural silicate melts. Part I: Low pressure properties. Geochimica et Cosmochimica Acta, 71(5), 1249–1265. https://doi.org/10.1016/j.gca.2006.11.015
Hart, S. R., & Zindler, A. (1986). In search of a bulk-Earth composition. Chemical Geology, 57(3–4), 247–267. https://doi.org/10.1016/0009-2541(86)90053-7
Hauck, S. A., Margot, J., Solomon, S. C., Phillips, R. J., Johnson, C. L., Lemoine, F. G., Mazarico, E., McCoy, T. J., Padovan, S., Peale, S. J., Perry, M. E., Smith, D. E., & Zuber, M. T. (2013). The curious case of Mercury’s internal structure. Journal of Geophysical Research: Planets, 118(6), 1204–1220. https://doi.org/10.1002/jgre.20091
Head, J. W., Chapman, C. R., Strom, R. G., Fassett, C. I., Denevi, B. W., Blewett, D. T., Ernst, C. M., Watters, T. R., Solomon, S. C., Murchie, S. L., Prockter, L. M., Chabot, N. L., Gillis-Davis, J. J., Whitten, J. L., Goudge, T. A., Baker, D. M. H., Hurwitz, D. M., Ostrach, L. R., Xiao, Z., … Nittler, L. R. (2011). Flood Volcanism in the Northern High Latitudes of Mercury Revealed by MESSENGER. Science, 333(6051), 1853–1856. https://doi.org/10.1126/science.1211997
Hiesinger, H., J., H., Alemanno, G., Bauch, K. E., D’Amore, M., Maturilli, A., Morlok, A., Reitze, M. P., Stangarone, C., Stojic, A. N., Varatharajan, I., Weber, I., & the MERTIS Co-I Team. (2020). Studying the Composition and Mineralogy of the Hermean Surface with the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) for the BepiColombo Mission: An Update. Space Science Reviews, 216(6), 110. https://doi.org/10.1007/s11214-020-00732-4
Holland, T. J. B., Green, E. C. R., & Powell, R. (2018). Melting of Peridotites through to Granites: A Simple Thermodynamic Model in the System KNCFMASHTOCr. Journal of Petrology, 59(5), 881–900. https://doi.org/10.1093/petrology/egy048
Holland, T. J. B., & Powell, R. (1998). An internally consistent thermodynamic data set for phases of petrological interest. Journal of Metamorphic Geology, 16(3), 309–343. https://doi.org/10.1111/j.1525-1314.1998.00140.x
Ingrao, N. J., Hammouda, T., Boyet, M., Gaborieau, M., Moine, B. N., Vlastelic, I., Bouhifd, M. A., Devidal, J.-L., Mathon, O., Testemale, D., Hazemann, J.-L., & Proux, O. (2019). Rare earth element partitioning between sulphides and melt: Evidence for Yb2+ and Sm2+ in EH chondrites. Geochimica et Cosmochimica Acta, 265, 182–197. https://doi.org/10.1016/j.gca.2019.08.036
Jarosewich, E. (1990). Chemical analyses of meteorites: A compilation of stony and iron meteorite analyses. Meteoritics, 25(4), 323–337. https://doi.org/10.1111/j.1945-5100.1990.tb00717.x
Katz, R. F., Spiegelman, M., & Langmuir, C. H. (2003). A new parameterization of hydrous mantle melting. Geochemistry, Geophysics, Geosystems, 4(9), 1073. https://doi.org/10.1029/2002gc000433
Keil, K. (2010). Enstatite achondrite meteorites (aubrites) and the histories of their asteroidal parent bodies. Geochemistry, 70(4), 295–317. https://doi.org/10.1016/j.chemer.2010.02.002
Kosinski, J. A., Gualtieri, J. G., & Ballato, A. (1992). Thermoelastic coefficients of alpha quartz. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 39(4), 502–507. https://doi.org/10.1109/58.148541
Kushiro, I. (1969). The System Forsterite Diopside-Silica With and Without Water at High Pressures. American Journal of Science, 267-A, 269–294. https://doi.org/10.2475/001c.125224
Lange, R. A., & Carmichael, I. S. E. (1987). Densities of Na2O-K2O-CaO-MgO-FeO-Fe2O3-Al2O3-TiO2-SiO2 liquids: New measurements and derived partial molar properties. Geochimica et Cosmochimica Acta, 51(11), 2931–2946. https://doi.org/10.1016/0016-7037(87)90368-1
Lark, L. H., Parman, S., Huber, C., Parmentier, E. M., & Head, J. W. (2022). Sulfides in Mercury’s Mantle: Implications for Mercury’s Interior as Interpreted From Moment of Inertia. Geophysical Research Letters, 49(6), 2021 096713. https://doi.org/10.1029/2021gl096713
Lauretta, D. S., Goreva, J. S., Hill, D. H., & Killgore, M. (2007). Bulk compositions of the CB chondrites Bencubbin, Fountain Hills, MAC 02675, and MIL 05082. Lunar and Planetary Institute Conference Abstracts, 38, 2236.
Lesher, C. E., & Spera, F. J. (2015). Thermodynamic and Transport Properties of Silicate Melts and Magma. In H. Sigurdsson (Ed.), The Encyclopedia of Volcanoes (2nd ed., pp. 113–141). Elsevier. https://doi.org/10.1016/b978-0-12-385938-9.00005-5
Ma, C., Beckett, J. R., & Rossman, G. R. (2011). Murchisite, Cr5S6, a new mineral from the Murchison meteorite. American Mineralogist, 96(11–12), 1905–1908. https://doi.org/10.2138/am.2011.3858
Ma, Z. (2001). Thermodynamic description for concentrated metallic solutions using interaction parameters. Metallurgical and Materials Transactions B, 32(1), 87–103. https://doi.org/10.1007/s11663-001-0011-0
Malavergne, V., Toplis, M. J., Berthet, S., & Jones, J. (2010). Highly reducing conditions during core formation on Mercury: Implications for internal structure and the origin of a magnetic field. Icarus, 206(1), 199–209. https://doi.org/10.1016/j.icarus.2009.09.001
Margot, J., Peale, S. J., Solomon, S. C., Hauck, S. A., Ghigo, F. D., Jurgens, R. F., Yseboodt, M., Giorgini, J. D., Padovan, S., & Campbell, D. B. (2012). Mercury’s moment of inertia from spin and gravity data. Journal of Geophysical Research: Planets, 117(E12). https://doi.org/10.1029/2012je004161
McCoy, T. J., Dickinson, T. L., & Lofgren, G. E. (1999). Partial melting of the Indarch (EH4) meteorite: A textural, chemical, and phase relations view of melting and melt migration. Meteoritics & Planetary Science, 34(5), 735–746. https://doi.org/10.1111/j.1945-5100.1999.tb01386.x
McCoy, T. J., Peplowski, P. N., McCubbin, F. M., & Weider, S. Z. (2018). The Geochemical and Mineralogical Diversity of Mercury. In S. C. Solomon, L. R. Nittler, & B. J. Anderson (Eds.), Mercury (pp. 176–190). Cambridge University Press. https://doi.org/10.1017/9781316650684.008
McCubbin, F. M., Riner, M. A., Vander Kaaden, K. E., & Burkemper, L. K. (2012). Is Mercury a volatile‐rich planet? Geophysical Research Letters, 39(9), 09202. https://doi.org/10.1029/2012gl051711
McDonough, W. F. (2025). Earth’s composition: Origin, energy budget, and insights from geoneutrinos. Geochimica et Cosmochimica Acta. https://doi.org/10.1016/j.gca.2025.12.060
Mitrofanov, I. G., Kozyrev, A. S., Lisov, D. I., Litvak, M. L., Malakhov, A. A., Mokrousov, M. I., Benkhoff, J., Owens, A., Schulz, R., & Quarati, F. (2021). The Mercury Gamma-Ray and Neutron Spectrometer (MGNS) Onboard the Mercury Planetary Orbiter of the BepiColombo Mission: Design Updates and First Measurements in Space. Space Science Reviews, 217(5), 67. https://doi.org/10.1007/s11214-021-00842-7
Morgan, J. W., & Anders, E. (1980). Chemical composition of Earth, Venus, and Mercury. Proceedings of the National Academy of Sciences USA, 77(12), 6973–6977. https://doi.org/10.1073/pnas.77.12.6973
Mouser, M. D., & Dygert, N. (2023). On the Potential for Cumulate Mantle Overturn in Mercury. Journal of Geophysical Research: Planets, 128(7). https://doi.org/10.1029/2023je007739
Mouser, M. D., Dygert, N., Anzures, B. A., Grambling, N. L., Hrubiak, R., Kono, Y., Shen, G., & Parman, S. W. (2021). Experimental Investigation of Mercury’s Magma Ocean Viscosity: Implications for the Formation of Mercury’s Cumulate Mantle, Its Subsequent Dynamic Evolution, and Crustal Petrogenesis. Journal of Geophysical Research: Planets, 126(11). https://doi.org/10.1029/2021je006946
Murrell, M. T., & Burnett, D. S. (1982). Actinide microdistributions in the enstatite meteorites. Geochimica et Cosmochimica Acta, 46(12), 2453–2460. https://doi.org/10.1016/0016-7037(82)90368-4
Mysen, B. O. (1983). The structure of silicate melts. Annual Review of Earth and Planetary Sciences, 11(1), 75–97. https://doi.org/10.1146/annurev.ea.11.050183.000451
Namur, O., & Charlier, B. (2017). Silicate mineralogy at the surface of Mercury. Nature Geoscience, 10(1), 9–13. https://doi.org/10.1038/ngeo2860
Namur, O., Charlier, B., & Holness, M. B. (2012). Dual origin of Fe–Ti–P gabbros by immiscibility and fractional crystallization of evolved tholeiitic basalts in the Sept Iles layered intrusion. Lithos, 154, 100–114. https://doi.org/10.1016/j.lithos.2012.06.034
Namur, O., Charlier, B., Holtz, F., Cartier, C., & McCammon, C. (2016). Sulfur solubility in reduced mafic silicate melts: Implications for the speciation and distribution of sulfur on Mercury. Earth and Planetary Science Letters, 448, 102–114. https://doi.org/10.1016/j.epsl.2016.05.024
Namur, O., Collinet, M., Charlier, B., Grove, T. L., Holtz, F., & McCammon, C. (2016). Melting processes and mantle sources of lavas on Mercury. Earth and Planetary Science Letters, 439, 117–128. https://doi.org/10.1016/j.epsl.2016.01.030
Nittler, L. R., Boujibar, A., Crapster‐Pregont, E., Frank, E. A., McCoy, T. J., McCubbin, F. M., Starr, R. D., Vorburger, A., & Weider, S. Z. (2023). Chromium on Mercury: New Results From the MESSENGER X‐Ray Spectrometer and Implications for the Innermost Planet’s Geochemical Evolution. Journal of Geophysical Research: Planets, 128(7). https://doi.org/10.1029/2022je007691
Nittler, L. R., Chabot, N. L., Grove, T. L., & Peplowski, P. N. (2018). The Chemical Composition of Mercury. In S. C. Solomon, L. R. Nittler, & B. J. Anderson (Eds.), Mercury (pp. 30–51). Cambridge University Press. https://doi.org/10.1017/9781316650684.003
Nittler, L. R., Frank, E. A., Weider, S. Z., Crapster-Pregont, E., Vorburger, A., Starr, R. D., & Solomon, S. C. (2020). Global major-element maps of Mercury from four years of MESSENGER X-Ray Spectrometer observations. Icarus, 345, 113716. https://doi.org/10.1016/j.icarus.2020.113716
Nittler, L. R., Starr, R. D., Weider, S. Z., McCoy, T. J., Boynton, W. V., Ebel, D. S., Ernst, C. M., Evans, L. G., Goldsten, J. O., Hamara, D. K., Lawrence, D. J., McNutt, R. L., Schlemm, C. E., Solomon, S. C., & Sprague, A. L. (2011). The Major-Element Composition of Mercury’s Surface from MESSENGER X-ray Spectrometry. Science, 333(6051), 1847–1850. https://doi.org/10.1126/science.1211567
Niu, Y., & Batiza, R. (1991). In Situ Densities of Morb Melts and Residual Mantle: Implications for Buoyancy Forces beneath Mid-Ocean Ridges. The Journal of Geology, 99(5), 767–775. https://doi.org/10.1086/629538
Ohtani, E., & Maeda, M. (2001). Density of basaltic melt at high pressure and stability of the melt at the base of the lower mantle. Earth and Planetary Science Letters, 193(1–2), 69–75. https://doi.org/10.1016/s0012-821x(01)00505-2
O’Neill, H. St. C. (2021). The Thermodynamic Controls on Sulfide Saturation in Silicate Melts with Application to Ocean Floor Basalts. In R. Moretti & D. R. Neuville (Eds.), Magma redox geochemistry (pp. 177–213). Wiley. https://doi.org/10.1002/9781119473206.ch10
Padovan, S., Wieczorek, M. A., Margot, J., Tosi, N., & Solomon, S. C. (2015). Thickness of the crust of Mercury from geoid‐to‐topography ratios. Geophysical Research Letters, 42(4), 1029–1038. https://doi.org/10.1002/2014gl062487
Peiris, S. M., Campbell, A. J., & Heinz, D. L. (1994). Compression of MgS to 54 GPa. Journal of Physics and Chemistry of Solids, 55(5), 413–419. https://doi.org/10.1016/0022-3697(94)90166-x
Peplowski, P. N., Evans, L. G., Hauck, S. A., McCoy, T. J., Boynton, W. V., Gillis-Davis, J. J., Ebel, D. S., Goldsten, J. O., Hamara, D. K., Lawrence, D. J., McNutt, R. L., Nittler, L. R., Solomon, S. C., Rhodes, E. A., Sprague, A. L., Starr, R. D., & Stockstill-Cahill, K. R. (2011). Radioactive Elements on Mercury’s Surface from MESSENGER: Implications for the Planet’s Formation and Evolution. Science, 333(6051), 1850–1852. https://doi.org/10.1126/science.1211576
Pirotte, H., Cartier, C., Namur, O., Pommier, A., Zhang, Y., Berndt, J., Klemme, S., & Charlier, B. (2023). Internal differentiation and volatile budget of Mercury inferred from the partitioning of heat-producing elements at highly reduced conditions. Icarus, 405, 115699. https://doi.org/10.1016/j.icarus.2023.115699
Pitsch, S., Connolly, J. A. D., Schmidt, M. W., Sossi, P. A., & Liebske, C. (2025). Solids and liquids in the (Fe, Mg, Ca)S-system: experimentally determined and thermodynamically modelled phase relations. Physics and Chemistry of Minerals, 52(2), 12. https://doi.org/10.1007/s00269-025-01313-z
Pommier, A., Tauber, M. J., Pirotte, H., Cody, G. D., Steele, A., Bullock, E. S., Charlier, B., & Mysen, B. O. (2023). Experimental investigation of the bonding of sulfur in highly reduced silicate glasses and melts. Geochimica et Cosmochimica Acta, 363, 114–128. https://doi.org/10.1016/j.gca.2023.10.027
Presnall, D. C. (1995). Phase Diagrams of Earth-Forming Minerals. In T. J. Ahrens (Ed.), Mineral physics & crystallography: a handbook of physical constants (pp. 248–268). American Geophysical Union. https://doi.org/10.1029/rf002p0248
Riel, N., Kaus, B. J. P., Green, E. C. R., & Berlie, N. (2022). MAGEMin, an Efficient Gibbs Energy Minimizer: Application to Igneous Systems. Geochemistry, Geophysics, Geosystems, 23(7). https://doi.org/10.1029/2022gc010427
Riner, M. A., Bina, C. R., Robinson, M. S., & Desch, S. J. (2008). Internal structure of Mercury: Implications of a molten core. Journal of Geophysical Research: Planets, 113(E8). https://doi.org/10.1029/2007je002993
Robie, R. A., & Hemingway, B. S. (1995). Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar (105 Pascals) pressure and at higher temperatures. U.S. Geological Survey Bulletin, 2131. https://doi.org/10.3133/b2131
Rothery, D. A., Massironi, M., Alemanno, G., Barraud, O., Besse, S., Bott, N., Brunetto, R., Bunce, E., Byrne, P., Capaccioni, F., Capria, M. T., Carli, C., Charlier, B., Cornet, T., Cremonese, G., D’Amore, M., De Sanctis, M. C., Doressoundiram, A., Ferranti, L., … Zambon, F. (2020). Rationale for BepiColombo Studies of Mercury’s Surface and Composition. Space Science Reviews, 216(4), 66. https://doi.org/10.1007/s11214-020-00694-7
Santerne, A., Brugger, B., Armstrong, D. J., Adibekyan, V., Lillo-Box, J., Gosselin, H., Aguichine, A., Almenara, J.-M., Barrado, D., Barros, S. C. C., Bayliss, D., Boisse, I., Bonomo, A. S., Bouchy, F., Brown, D. J. A., Deleuil, M., Delgado Mena, E., Demangeon, O., Díaz, R. F., … Vigan, A. (2018). An Earth-sized exoplanet with a Mercury-like composition. Nature Astronomy, 2(5), 393–400. https://doi.org/10.1038/s41550-018-0420-5
Saracino, F., Charlier, B., Zhang, Y., Lécaille, M., Lin, Y., & Namur, O. (2025). The role of sulfur on the liquidus temperature and olivine-orthopyroxene equilibria in highly reduced magmas. Chemical Geology, 683, 122777. https://doi.org/10.1016/j.chemgeo.2025.122777
Saracino, F., Charlier, B., Zhang, Y., & Namur, O. (2026). Chemical analyses of experimental products and magma ocean crystallization model for Mercury [dataset]. Version v10. Zenodo. https://doi.org/10.5281/zenodo.20273496
Schaefer, L., & Elkins-Tanton, L. T. (2018). Magma oceans as a critical stage in the tectonic development of rocky planets. Philosophical Transaction of the Royal Society A, 376(2132), 20180109. https://doi.org/10.1098/rsta.2018.0109
Schmidt, M. W., & Kraettli, G. (2022). Experimental Crystallization of the Lunar Magma Ocean, Initial Selenotherm and Density Stratification, and Implications for Crust Formation, Overturn and the Bulk Silicate Moon Composition. Journal of Geophysical Research: Planets, 127(5), 5. https://doi.org/10.1029/2022je007187
Schubert, G., Ross, M. N., Stevenson, D. J., & Spohn, T. (1988). Mercury’s thermal history and the generation of its magnetic field. In F. Vilas, C. R. Chapman, & M. S. Matthews (Eds.), Mercury (pp. 429–460). University of Arizona Press. https://doi.org/10.2307/j.ctv1v090nx.17
Singman, C. N. (1984). Atomic volume and allotropy of the elements. Journal of Chemical Education, 61(2), 137. https://doi.org/10.1021/ed061p137
Smith, D. E., Zuber, M. T., Phillips, R. J., Solomon, S. C., Hauck, S. A., Lemoine, F. G., Mazarico, E., Neumann, G. A., Peale, S. J., Margot, J.-L., Johnson, C. L., Torrence, M. H., Perry, M. E., Rowlands, D. D., Goossens, S., Head, J. W., & Taylor, A. H. (2012). Gravity Field and Internal Structure of Mercury from MESSENGER. Science, 336(6078), 214–217. https://doi.org/10.1126/science.1218809
Snyder, G. A., Taylor, L. A., & Neal, C. R. (1992). A chemical model for generating the sources of mare basalts: Combined equilibrium and fractional crystallization of the lunar magmasphere. Geochimica et Cosmochimica Acta, 56(10), 3809–3823. https://doi.org/10.1016/0016-7037(92)90172-f
Solomatov, V. (2015). Magma Oceans and Primordial Mantle Differentiation. In G. Schubert (Ed.), Treatise on Geophysics (2nd ed., Vol. 9, pp. 81–104). Elsevier. https://doi.org/10.1016/b978-0-444-53802-4.00155-x
Steenstra, E. S., Seegers, A. X., Putter, R., Berndt, J., Klemme, S., Matveev, S., Bullock, E. S., & van Westrenen, W. (2020). Metal-silicate partitioning systematics of siderophile elements at reducing conditions: A new experimental database. Icarus, 335, 113391. https://doi.org/10.1016/j.icarus.2019.113391
Steenstra, E. S., Trautner, V. T., Berndt, J., Klemme, S., & van Westrenen, W. (2020). Trace element partitioning between sulfide-, metal- and silicate melts at highly reduced conditions: Insights into the distribution of volatile elements during core formation in reduced bodies. Icarus, 335, 113408. https://doi.org/10.1016/j.icarus.2019.113408
Steinbrügge, G., Dumberry, M., Rivoldini, A., Schubert, G., Cao, H., Schroeder, D. M., & Soderlund, K. M. (2021). Challenges on Mercury’s Interior Structure Posed by the New Measurements of its Obliquity and Tides. Geophysical Research Letters, 48(3). https://doi.org/10.1029/2020gl089895
Toplis, M. J., Dingwell, D. B., & Libourel, G. (1994). The effect of phosphorus on the iron redox ratio, viscosity, and density of an evolved ferro-basalt. Contributions to Mineralogy and Petrology, 117(3), 293–304. https://doi.org/10.1007/bf00310870
Vander Kaaden, K. E., & McCubbin, F. M. (2015). Exotic crust formation on Mercury: Consequences of a shallow, FeO‐poor mantle. Journal of Geophysical Research: Planets, 120(2), 195–209. https://doi.org/10.1002/2014je004733
Walker, D., Longhi, J., & Hays, J. F. (1975). Differentiation of a very thick magma body and implications for the source region of mare basalts. Proceedings of the Lunar Science Conference, 6, 1103–1120.
Walter, M. J., & Presnall, D. C. (1994). Melting Behavior of Simplified Lherzolite in the System CaO-MgO-Al2O3-SiO2-Na2O from 7 to 35 kbar. Journal of Petrology, 35(2), 329–359. https://doi.org/10.1093/petrology/35.2.329
Wang, Y., Xiao, Z., & Xu, R. (2022). Multiple Mantle Sources of High‐Magnesium Terranes on Mercury. Journal of Geophysical Research: Planets, 127(5). https://doi.org/10.1029/2022je007218
Warren, P. H. (1988). The origin of pristine KREEP: effects of mixing between UrKREEP and the magmas parental to the Mg-rich cumulates. Lunar and Planetary Science Conference Proceedings 233–241.
Warren, P. H. (1995). Extrapolated partial molar densities of SO3, P2O5, and other oxides in silicate melts. American Mineralogist, 80(9–10), 1085–1088. https://doi.org/10.2138/am-1995-9-1027
Warren, P. H., & Wasson, J. T. (1979). The origin of KREEP. Reviews of Geophysics, 17(1), 73–88. https://doi.org/10.1029/rg017i001p00073
Weider, S. Z., Nittler, L. R., Starr, R. D., Crapster-Pregont, E. J., Peplowski, P. N., Denevi, B. W., Head, J. W., Byrne, P. K., Hauck, S. A., Ebel, D. S., & Solomon, S. C. (2015). Evidence for geochemical terranes on Mercury: Global mapping of major elements with MESSENGER’s X-Ray Spectrometer. Earth and Planetary Science Letters, 416, 109–120. https://doi.org/10.1016/j.epsl.2015.01.023
Weisberg, M. K., Prinz, M., Clayton, R. N., Mayeda, T. K., Sugiura, N., Zashu, S., & Ebihara, M. (2001). A new metal‐rich chondrite grouplet. Meteoritics & Planetary Science, 36(3), 401–418. https://doi.org/10.1111/j.1945-5100.2001.tb01882.x
Weisberg, M. K., Prinz, M., Humayun, M., & Campbell, A. J. (2000). Origin of metal in the CB (Bencubbinite) chondrites. Lunar and Planetary Institute Conference Abstracts, 31, 1466.
Weng, Y.-H., & Presnall, D. C. (2001). The system diopside forsterite enstatite at 5.1 GPa: a ternary model for melting of the mantle. The Canadian Mineralogist, 39(2), 299–308. https://doi.org/10.2113/gscanmin.39.2.299
White, W. M. (2020). Geochemistry (2nd ed., p. 960). Wiley-Blackwell.
Wilbur, Z. E., Udry, A., McCubbin, F. M., vander Kaaden, K. E., DeFelice, C., Ziegler, K., Ross, D. K., McCoy, T. J., Gross, J., Barnes, J. J., Dygert, N., Zeigler, R. A., Turrin, B. D., & McCoy, C. (2022). The effects of highly reduced magmatism revealed through aubrites. Meteoritics & Planetary Science, 57(7), 1387–1420. https://doi.org/10.1111/maps.13823
Wohlers, A., & Wood, B. J. (2017). Uranium, thorium and REE partitioning into sulfide liquids: Implications for reduced S-rich bodies. Geochimica et Cosmochimica Acta, 205, 226–244. https://doi.org/10.1016/j.gca.2017.01.050
Xu, Y., Lin, Y., Wu, P., Namur, O., Zhang, Y., & Charlier, B. (2024). A diamond-bearing core-mantle boundary on Mercury. Nature Communications, 15(1), 5061. https://doi.org/10.1038/s41467-024-49305-x
Zhang, Y., Charlier, B., Krein, S. B., Grove, T. L., Namur, O., & Holtz, F. (2024). The very late-stage crystallization of the lunar magma ocean and the composition of immiscible urKREEP. Earth and Planetary Science Letters, 646, 118989. https://doi.org/10.1016/j.epsl.2024.118989
Zolotov, M. Yu., Sprague, A. L., Hauck, S. A., Nittler, L. R., Solomon, S. C., & Weider, S. Z. (2013). The redox state, FeO content, and origin of sulfur‐rich magmas on Mercury. Journal of Geophysical Research: Planets, 118(1), 138–146. https://doi.org/10.1029/2012je004274
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