Abstract
The ultrabasic–basic magmatic evolution of the lower mantle material includes important physicochemical phenomena, such as the stishovite paradox and the genesis of superdeep diamonds. Stishovite SiO2 and periclase–wüstite solid solutions, (MgO · FeO)ss, associate paradoxically in primary inclusions of superdeep lower mantle diamonds. Under the conditions of the Earth’s crust and upper mantle, such oxide assemblages are chemically impossible (forbidden), because the oxides MgO and FeO and SiO2 react to produce intermediate silicate compounds, enstatite and ferrosilite. Experimental and physicochemical investigations of melting phase relations in the MgO–FeO–SiO2–CaSiO3 system at 24 GPa revealed a peritectic mechanism of the stishovite paradox, (Mg, Fe)SiO3 (bridgmanite) + L = SiO2 + (Mg, Fe)O during the ultrabasic–basic magmatic evolution of the primitive oxide–silicate lower mantle material. Experiments at 26 GPa with oxide–silicate–carbonate–carbon melts, parental for diamonds and primary inclusions in them, demonstrated the equilibrium formation of superdeep diamonds in association with ultrabasic, (Mg, Fe)SiO3 (bridgmanite) + (MgO · FeO)ss (ferropericlase), and basic minerals, (FeO · MgO)ss (magnesiowüstite) + SiO2 (stishovite). This leads to the conclusion that a peritectic mechanism, similar to that responsible for the stishovite paradox in the pristine lower mantle material, operates also in the parental media of superdeep diamonds. Thus, this mechanism promotes both the ultrabasic–basic evolution of primitive oxide–silicate magmas in the lower mantle and oxide–silicate–carbonate melts parental for superdeep diamonds and their paradoxical primary inclusions.
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References
M. Akaogi, “Phase transformations of minerals in the transition zone and upper part of the lower mantle,” in Advances in High-Pressure Mineralogy, Ed. by E. Ohtani, Geol. Soc. Am. Sp. Paper 421, 1–13 (2007).
A. V. Bobrov and Yu. A. Litvin, “Peridotite–eclogite–carbonatite systems at 7.0–8.5 GPa: concentration barrier of diamond nucleation and syngenesis of its silicate and carbonate inclusions,” Russ. Geol. Geophys. 50 (12), 1221–1233 (2009).
D. J. Frost, B. T. Poe, R. G. Tronnes, C. Libske, F. Duba, and D. C. Rubie “A new large-volume multianvil system,” Phys. Earth Planet. Inter. 143, 507–514 (2004).
T. Gasparik and Yu. A. Litvin, “Stability of Na2Mg2Si2O7 and melting relations on the forsterite–jadeite join at pressures up to 22 GPa,” Eur. J. Mineral. 69 (2), 311–326 (1997).
B. Harte, “Diamond formation in the deep mantle: the record of mineral inclusions and their distribution in relation to mantle dehydration zones,” Mineral. Mag. 74 (2), 189–215 (2010).
P. C. Hayman, M. G. Kopylova, and F. V. Kaminsky, “Lower mantle diamonds from Rio Soriso (Juina area, Mato Grosso, Brazil),” Contrib. Mineral. Petrol. 149, 430–445 (2005).
K. Hirose, “Phase transitions in pyrolite mantle around 670-km depth: implications for upwelling of plumes from the lower mantle,” J. Geophys. Res. 107 (B4), ECV 3–1–ECV 3–13 (2005).
K. Hirose, Y. Fei, Y. Ma, and H. K. Mao, “The fate of subducted basaltic crust in the Earth’s lower mantle,” Nature 397, 53–56 (1999).
T. Irifune and A. E. Ringwood, “Phase transformations in subducted oceanic crust and buoyancy relationships at depths of 600–800 km in the mantle,” Earth Planet. Sci. Lett. 117, 101–110 (1993).
T. Irifune and T. Tsuchiya, “Mineralogy of the Earth–phase transitions and mineralogy of the lower mantle,” in Treatise on Geophysics (Elsevier, 2007), pp. 33–62.
F. Kaminsky, “Mineralogy of the lower mantle: a review of ‘super-deep’ mineral inclusions in diamond,” Earth Sci. Rev. 110, 127–147 (2012).
A. V. Kuzyura, Yu. A. Litvin, and T. Jeffries, “Interface partition coefficients of trace elements in carbonate–silicate parental media for diamonds and paragenetic inclusions (experiments at 7.0–8.5 GPa),” Russ. Geol. Geophys. 56 (1), 286–299 (2015).
C. Liebske and D. J. Frost, “Melting phase relations in the MgO–MgSiO3 system between 16 and 26 GPa: implication for melting in Earth’s deep interior,” Earth Planet. Sci. Lett. 345, 159–170 (2012).
V. Yu. Litvin, T. Gasparik, and Yu. A. Litvin, “The enstatite–nepheline system in experiments at 6.5–13.5 GPa: an importance of Na2Mg2Si2O7 for melting of the nepheline-normative mantle,” Geochem. Int. 38 (1), 100–107 (2000).
Yu. A. Litvin, Physicochemical Studies of Melting in the Earth’s Interior (Nauka, Moscow, 1991) [in Russian].
Yu. A. Litvin, “Mantle hot spots and experiment up to 10 GPa: alkaline reactions, carbonation of lithosphere, and new diamond-forming systems,” Geol. Geofiz. 39 (12), 1772–1779 (1998).
Yu. A. Litvin, “High-pressure mineralogy of diamond genesis,” in Advances in High-Pressure Mineralogy Ed. by E. Ohtani, Geol. Soc. Am. Sp. Pap. 421, 83–103 (2007).
Yu. A. Litvin, “The physicochemical conditions of diamond formation in the mantle matter: experimental studies,” Russ. Geol. Geophys. 50 (12), 1188–1200 (2009).
Yu. A. Litvin, “Ultrabasic–basic differentiation of the mantle magmas and diamond-parental melts on evidence of physico-chemical experiments,” in 1st European Mineralogical Society Conference (Jointly with IMA), Frankfurt, Germany, 2012 (Frankfurt, 2012a).
Yu. A. Litvin, “Ultrabasic–basic evolution of upper mantle magmas: petrogenetic links between diamond-bearing peridotites and eclogites (on evidence of physico-chemical experiment),” Geophys. Res. Abstr. 14, EGU2012-3610-1 (2012b).
Yu. A. Litvin, “Physicochemical conditions of syngenesis of diamond and heterogeneous inclusions in carbonate–silicate parental melts (experimental studies),” Mineral. Zh. 35 (2), 5–24 (2013).
Yu. A. Litvin, “The stishovite paradox in the genesis of superdeep diamonds,” Dokl. Earth Sci. 455 (1), 274–278 (2014).
Yu. A. Litvin, P. G. Vasil’ev, A. V. Bobrov, V. Yu. Okoemova, and A. V. Kuzyura, “Parental media of natural diamonds and primary mineral inclusions in them: evidence from physicochemical experiment,” Geochem. Int. 50 (9), 726–759 (2012).
Yu. Litvin, A. Spivak, N. Solopova, and L. Dubrovinsky, “On origin of lower-mantle diamonds and their primary inclusions,” Phys. Earth Planet. Inter. 228, 176–185 (2014).
S. Maaloe Principles of Igneous Petrology (Springer, Berlin, 1985).
N. Nishiyama and T. Yagi, “Phase relation and mineral chemistry in pyrolite to 2200°C under the lower mantle pressures and implications for dynamics on mantle plumes,” J. Geophys. Res. 108 (B4), ECV 7–1–ECV 7–12 (2003).
S. Ono E. Ito, and T. Katsura, “Mineralogy of subducted basaltic crust (MORB) from 25 and 37 GPa, and chemical heterogeneity of the lower mantle,” Earth Planet. Sci. Lett. 190, 57–63 (2001).
F. N. Rhines, Phase Diagrams in Metallurgy (New York: McGraw-Hill, 1956).
A. E. Ringwood, Composition and Petrology of the Earth’s Mantle (McGraw-Hill, New York, 1975).
T. Stachel, G. P. Brey, and J. W. Harris, “Inclusions in sublithospheric diamonds: glimpses of deep Earth,” Elements 1, 73–78 (2005).
O. Tschauner, C. Ma, J. R. Becket, C. Prescher, V. B. Prakapenka, and G. R. Rossman, “Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite,” Science 346 (6213), 1100–1102 (2014).
B. J. Wood, “Phase transformations and partitioning relations in peridotite under lower mantle conditions,” Earth Planet. Sci. Lett. 174, 341–354 (2000).
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Original Russian Text © Yu.A. Litvin, A.V. Spivak, L.S. Dubrovinsky, 2016, published in Geokhimiya, 2016, No. 11, pp. 970–983.
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Litvin, Y.A., Spivak, A.V. & Dubrovinsky, L.S. Magmatic evolution of the material of the Earth’s lower mantle: Stishovite paradox and origin of superdeep diamonds (Experiments at 24–26 GPa). Geochem. Int. 54, 936–947 (2016). https://doi.org/10.1134/S0016702916090032
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DOI: https://doi.org/10.1134/S0016702916090032