Abstract
The main rock-forming minerals of pyroxenites in the Krestovskaya intrusion in the Maimecha-Kotui alkaline-ultramafic province are Al- and Ti-fassaite and low-Al high-Mg diopside. Both clinopyroxene varieties bear primary inclusions of alkaline-ultramafic melts enriched in incompatible elements, F (up to 0.3–0.4 wt %), and probably also CO2. The homogenization temperatures of the inclusions are approximately equal and lie within the range of 1200–1300° C. However, the melts preserved in the diopside are undersaturated in Si and Al and richer in Fe, Ba, Sr, Na, and incompatible elements than melt inclusions in the fassaite; they are free in H2O (no more than 0.003 wt %); and are close in composition to katungite-mafurite. Melt inclusions in the fassaite are richer in Si, Mg, and Al; contain up to 0.435 wt % H2O; and compositionally approach alkaline picritoids. Melts of such composition cannot be produced by the differentiation of a single parental magma and were most probably derived from different mantle sources. Judging from the high concentrations of incompatible elements and their distribution in the melt inclusions, these sources were localized in the undepleted mantle at various depths (the picritoid melts were derived from a deeper source) and underwent different degrees of partial melting, with garnet and plagioclase remaining in the residue. The coexistence of diopside and fassaite in a single rock can be explained by the concurrent development of magmatic chambers at different depths during rifting, when this process was repeatedly reactivated and it facilitated the arrival of primitive melts derived from different mantle sources into the same magmatic chambers, in which these melts mixed and evolved. These processes probably predetermined the origin of the alkaline-ultramafic carbonatite intrusions and perhaps also the potassic series in the East African Rift.
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References
L. S. Egorov, “Alkali-Ultrabasic Magmatism and Its Metallogeny,” Geol. Rudn. Mestorozhd., No. 4, 24–40 (1985).
L. S. Egorov, “Morphology, Structure, and Evolution of the Guli Alkali Ultrabasic-Carbonatite Massif,” Izv. Akad. Nauk SSSR, Ser. Geol., No. 7, 41–56 (1989).
A. A. Kukharenko, M. P. Orlova, A. G. Bulakh, et al., Caledonian Complex of the Ultrabasic Alkaline Rocks and Carbonatites of the Kola Peninsula and North Karelia (Geology, Petrology, and Geochemistry) (Nauka, Moscow, 1965) [in Russian].
A. V. Sobolev, V. S. Kamenetskii, and N. N. Kononkova, “New Petrological Data on Siberian Meymechites,” Geokhimiya, No. 8, 1084–1094 (1991).
L. N. Kogarko and I. D. Ryabchikov, “Conditions of the Generation of the Meymechite Magmas, Polar Siberia, Based on Geochemical Data,” Geokhimiya, No. 12, 1699–1698 (1995).
I. T. Rass, “Melilite Rocks in the Alkaline-Ultrabasic Complexes of the Northwestern Siberia: Petrochemistry, Geochemistry, and Origin,” Geokhimiya, No. 10, 1098–1108 (2000) [Geochem. Int. 38, 1003–1012 (2000)].
I. T. Rass and P. Yu. Plechov, “Melt Inclusions in Olivines from the Olivine-Melilitite Rock of the Guli Massif, Northwestern Siberian Platform,” Dokl. Akad. Nauk 375, 389–392 (2000) [Dokl. Earth Sci. 375, 1399–1402 (2000)].
N. Arndt, V. Lehnert, and Yu. Vasiliev, “Meimechites: Highly Magnesian Lithosphere-Contaminated Alkaline Magmas from Deep Subcontinental Mantle,” Lithos 34, 41–59 (1995).
N. Ardnt, C. Chauvel, G. Czamanske, and V. Fedorenko, “Two Mantle Sources, Two Plumbing Systems: Tholei itic and Alkaline Magmatism of the Maymecha River Basin, Siberian Flood Volcanic Province,” Contrib. Miner. Petrol. 133, 297–313 (1998).
Yu. A. Balashov, Geochemistry of Rare-Earth Elements (Nauka, Moscow, 1972) [in Russian].
A. M. Sazonov, E. A. Zvyagina, S. I. Leont’ev, et al., Platinum-Bearing Alkali-Ultrabasic Intrusions of Polar Siberia (Tomsk, 2001) [in Russian].
N. Morimoto, J. Fabries, A. K. Ferguson, et al., “Nomenclature of Pyroxenes,” Am. Mineral. 73, 1123–1133 (1988).
N. L. Dobretsov, Yu. N. Kochkin, A. P. Krivenko, et al., Rock-Forming Pyroxenes (Nauka, Moscow, 1971) [in Russian].
A. V. Sobolev and A. B. Slutskii, “Composition and Crystallization Conditions of the Parental Melt of the Siberian Meymechites in Light of the General Problem of Ultrabasic Magmas,” Geol. Geofiz., No. 12, 97–110 (1984).
W. A. Deer, R. A. Howie, and J. Zusman, Rock-Forming Minerals (Wiley, New York, 1963; Mir, Moscow, 1966).
A. V. Sobolev and V. T. Batanova, “Mantle Lherzolites of the Troodos Ophiolite Complex, Cyprus Island: Geochemistry of Clinopyroxene,” Petrologiya 3, 487–495 (1995).
V. V. Belousov, V. I. Gerasimovskii, A. V. Goryachev, et al., East African Rift System (Nauka, Moscow, 1974), Vol. 3 [in Russian].
S. R. Taylor and S. M. McLennan, The Continental Crust: Its Composition and Evolution (Blackwell, Oxford, 1985).
K. T. M. Johnson, “Experimental Cpx/and Garnet/Melt Partitioning of REE and Other Trace Elements at High Pressures: Petrogenetic Implications,” Mineral. Mag. 58 A, 454–455 (1998).
K. T. M. Johnson, “Experimental Determination of Partition Coefficients for Rare Earth and High-Field-Strength Elements between Clinopyroxene, Garnet, and Basaltic Melt at High Pressure,” Contrib. Mineral. Petrol. 133, 60–68 (1998).
A. V. Sobolev, V. A. Magdasov, and M. V. Portnyagin, “Melt Inclusions in Minerals as a Source of Principle Petrological Information,” Petrologiya 4, 326–336 (1996) [Petrology 4, 209–220 (1996)].
F. P. Lesnov, “Tendencies in the Distribution of Rare Earth Elements in Clinopyroxenes,” Zap. Vses. Mineral. O-va, No. 4, 78–96 (2001).
E. A. Landa and S. M. Lyapunov, “On the Content of Rare-Earth Elements in the Dunites of the Gulinskii Pluton and Genesis of These Rocks,” Dokl. Akad. Nauk SSSR 276, 177–180 (1984).
W. P. Nash and H. R. Crecraft, “Partition Coefficients for Trace Elements in Silicic Magmas,” Geochim. Cosmochim. Acta 49, 2309–2322 (1985).
R. L. Cullers and J. L. Graf, “Rare Earth Elements in Igneous Rocks of the Continental Crust: Predominantly Basic and Ultrabasic Rocks. Part 7.2. Kimberlites,” in Rare Earth Element Geochemistry (Elsevier, 1984), Vol. 2, pp. 239–243 (1984).
M. G. Barth, W. F. McDonough, and R. L. Rudnik, “Tracing the Budget of Nb and Ta in the Continental Crust,” Chem. Geol. 165, 197–213 (2000).
W. J. Harrison, “Partitioning of REE between Minerals and Coexisting Melts during Partial Melting of a Garnet Lherzolite,” Am. Mineral. 66, 242–259 (1981).
L. I. Panina and L. M. Usoltseva, “Alkaline-Ultrabasic Mantle-Derived Magmas, Their Sources, and Crystallization Features: Data of Melt Inclusion Studies,” Lithos 103, 431–444 (2008).
A. A. Gurenko, A. V. Sobolev, and N. N. Kononkova, “New Petrological Data on Ugandites from the East African Rift: Evidence from Melt Inclusions in Minerals,” Dokl. Akad. Nauk SSSR 305, 1458–1463 (1989).
L. N. Kogarko, Genetic Problems of Agpaitic Magmas (Nauka, Moscow, 1974) [in Russian].
I. D. Ryabchikov, “Processes of Mantle Magma Formation,” in Magmatic Evolution in the Earth’s History (Nauka, Moscow, 1987), pp. 349–371 [in Russian].
S. I. Tomkiev, “Carbonatites: Their Nature and Origin,” Mineral, Sb. Lvovsk. Univ., No. 16, 25–30 (1962).
G. Brey and D. H. Green, “Solubility of CO2 in Olivine Melilitite at High Pressure and Role of CO2 in the Earth’s Upper Mantle,” Contrib. Mineral. Petrol. 55, 217–230 (1976).
D. H. Eggler, “Effect of CO2 on the Melting of Peridotite,” Yearbook Carnegie Inst. 73, 215–224 (1974).
I. D. Ryabchikov and D. H. Green, “Role of Carbon Dioxide in the Petrogenesis of High-Potassium Magmas,” in Petrologic Problems of the Earth’s Crust and Upper Mantle (Nauka, Novosibirsk, 1978), pp. 48–64 [in Russian].
M. Arima and A. D. Edgar, “High Pressure Experimental Studies on a Katungite and Their Bearing on the Genesis of Some Potassium-Rich Magmas of the West Branch of the Africa Rift,” J. Petrol. 24, 166–187 (1983).
L. N. Kogarko, S. F. Karpenko, A. V. Lyalikov, et al., “Isotopic Criteria for Genesis of Meymechite Magmatism,” Dokl. Akad. Nauk SSSR 301, 939–942 (1988).
P. J. Wyllie, “The Origin of Kimberlite,” J. Geophys. Res. 85, 6902–6910 (1980).
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Original Russian Text © L.I. Panina, L.M. Usol’tseva, 2009, published in Geokhimiya, 2009, No. 4, pp. 378–392.
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Panina, L.I., Usol’tseva, L.M. Pyroxenites of the Krestovskaya alkaline-ultramafic intrusion: Composition of parental magmas and their sources. Geochem. Int. 47, 358–371 (2009). https://doi.org/10.1134/S001670290904003X
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DOI: https://doi.org/10.1134/S001670290904003X