Abstract
Magnetic characteristics and compositions of ferromagnetic species of trap samples from the Norilsk borehole are studied; the borehole penetrated the complete section of a trappean rock sequence (nearly 3 km) represented by eight magmatic formations. The lowest (Ivakinskian) formation consists of rocks of the subalkalic type, and the remaining formations generally belong to the tholeiitic series. Primary ferromagnetic phases are represented by titanomagnetites with various ulvospinel concentrations in a solid solution. Three modes characterized by TiO2 concentrations of 14.6, 18, and 23.9 wt % are revealed. The Ivakinskian rocks are most magnetized, and magnetization is low in core samples from depths of 1700–2500 m. Various magnetic characteristics have polymodal distributions of their values. Plateau basalt samples of the Ivakinskian Formation from other regions of Siberia, the Lory Plateau (Armenia), and Kamchatka are additionally studied. On the whole, titanomagnetites of plateau basalts were crystallized under the quartz-fayalite-magnetite (QFM) buffer conditions.
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References
O. M. Alypova, “Properties of Ferromagnetic Minerals in Young Volcanic Rocks of Kamchatka from Thermomagnetic Data and Their Relation to the Conditions of Deep Magma Crystallization,” in Volcanism and the Earth’s Interiors (Nedra, Moscow, 1971), pp. 122–126 [in Russian].
V. I. Bagin, S. Yu. Brodskaya, G. N. Petrova, and D. M. Pechersky, “Source Depths of Kurile-Kamchatka Island Arc Volcanoes from Data of Thermomagnetic Studies of Volcanic Rocks,” Izv. Akad. Nauk SSSR, Ser. Fiz. Zemli, No. 5, 57–68 (1971).
A. V. Egorkin, S. K. Tsyganov, and N. M. Chernyshov, “Upper Mantle of Siberia,” in Lectures Delivered at the 27th Session of the International Geophysical Committee (Nauka, Moscow, 1984), pp. 29–56 [in Russian].
V. A. Ermakov, Formation Differentiation of Quaternary Volcanic Rocks (Nedra, Moscow, 1977) [in Russian].
Yu. S. Genshaft, “Trappean Magmatism and Ultrabasic Alkalic Complexes: A Case Study of Siberian Traps and Meimecha-Kotui Alkalic Province,” Electronic Zh. Vestn. OGGGGN RAN, No. 3(18) (2001).
Yu. S. Genshaft, V. A. Tselmovich, and A. K. Gapeev, “Crystallization of Fe-Ti Oxide Minerals in the Basalt-Ilmenite System at High Pressures and Temperatures,” Fiz. Zemli, No. 2, 25–34 (1999) [Izvestiya, Phys. Solid Earth 35, 109–117 (1999)].
Yu. S. Genshaft and L. V. Tikhonov, “Origin of the Ferromagnetic Composition and Magnetic Properties of Iceland Basalts,” Fiz. Zemli, No. 12, 22–39 (2005) [Izvestiya, Phys. Solid Earth 41, 976–993 (2005)].
Geology of the Armyanskaya SSR, Vol. IV: Petrography. Volcanic Rocks (AN Arm. SSR, Yerevan, 1970) [in Russian].
A. M. Glevasskaya, Magnetic Minerals and Magnetism of Volcanic Rocks (Naukova Dumka, Kiev, 1983) [in Russian].
Large Fissure Eruption of Tolbachik Volcano of 1975–1976 (Kamchataka) (Nauka, Moscow, 1984) [in Russian].
D. M. Pechersky, V. I. Bagin, S. Yu. Brodskaya, and Z. V. Sharonova, Magnetism and Formation Conditions of Igneous Rocks (Nauka, Moscow, 1975) [in Russian].
V. V. Ryabov, A. Ya. Shevko, and M. P. Gora, Magmatic Formations of Norilsk Region, Vol. 1: Petrology of Traps (Nonparel, Novosibirsk, 2000) [in Russian].
A. N. Sirin and K. M. Timerbaeva, “On Two Types of Basalts and the Composition of Primeval Magma of the Klyuchevskaya Group Volcanoes in Kamchatka,: in Volcanism and the Earth’s Interiors (Nauka, Moscow, 1971) [in Russian].
E. M. Spiridonov, V. M. Ladygin, O. N. Simonov, et al., Metavolcanic Trap Rocks of the Prehnite—Pumpellyite and Zeolite Facies in the Norilsk Region of the Siberian Platform (MGU, Moscow, 2000) [in Russian].
L. V. Tikhonov, “Petromagnetism of 90° and Kerguelen Ridge Basalts,” Fiz. Zemli, No. 11, 89–93 (1993).
L. V. Tikhonov, A. N. Didenko, and V. A. Tselmovich, “Petromagnetism of Cenozoic Basalts in the Baikal-Mongolia Region,” Fiz. Zemli, No. 10, 66–77 (2003) [Izvestiya, Phys. Solid Earth 39, 844–855 (2003)].
K. M. Timerbaeva, Petrology of Klyuchevskaya Volcanoes in Kamchatka (Nauka, Moscow, 1967) [in Russian].
V. I. Trukhin, V. A. Zhilyaeva, N. N. Zinchuk, and N. N. Romanov, Magnetism of Kimberlites and Traps (MGU, Moscow, 1989) [in Russian].
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Original Russian Text © Yu.S. Genshaft, L.V. Tikhonov, V.M. Ladygin, E.M. Spiridonov, A.Ya. Saltykovskii, 2008, published in Fizika Zemli, 2008, No. 2, pp. 80–96.
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Genshaft, Y.S., Tikhonov, L.V., Ladygin, V.M. et al. Ferrospinels and petromagnetism of Siberian traps: A case study of traps drilled by the Norilsk borehole. Izv., Phys. Solid Earth 44, 158–174 (2008). https://doi.org/10.1134/S1069351308020055
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DOI: https://doi.org/10.1134/S1069351308020055