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Geochemistry of the Siberian Trap of the Noril'sk area, USSR, with implications for the relative contributions of crust and mantle to flood basalt magmatism

Contributions to Mineralogy and Petrology volume 104, pages 631–644 (1990)Cite this article

Abstract

The sequence investigated of the Siberian Trap at Noril'sk, USSR, consists of at least 45 flows that have been divided into six lava suites. The lower three suites consist of alkalic to subalkalic basalts (the Ivakinsky suite), overlain by nonporphyritic basalts (the Syverminsky suite), and porphyritic and picritic basalts (the Gudchikhinsky suite). The upper three suites are tholeiitic. The uppermost 750 m of dominantly non-porphyritic basalt belong to the Mokulaevsky suite and are characterized by a nearly constant Mg number (0.54–0.56), SiO2 (48.2–49.1 wt%), Ce (12–18 ppm), and Ce/Yb (5–8). The underlying 1100 m of dominantly porphyritic basalt belong to the Morongovsky and Nadezhdinsky suites. There is a continuous increase in SiO2 (48.1–55.2 wt%), Ce (12–41 ppm), and Ce/Yb (5–18) from the top of the Mokulaevsky to the base of the Nadezhdinsky with little change in the Mg number (0.53–0.59). Mokulaevsky magmas have trace element signatures similar to slightly contaminated transitional type mid-ocean ridge basalts. The change in major and trace element geochemistry in the upper three suites is consistent with a decline in the degree of anatexis and assimilation of tonalitic upper crust by Mokulaevsky magma. The Nadezhdinsky and underlaying lavas thicken within and thus appear to be related to an elongate basin centred on the Noril'sk-Talnakh mining camp. The Mokulaevsky and Morongovsky lavas thicken to the east and appear to be related to a basin centred more than 100 km to the east of the Noril'sk region; these magmas may have risen up out of a different conduit system.

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Authors and Affiliations

  1. Geoscience Laboratories, Ontario Geological Survey, 77 Grenville Street, M7A 1W4, Toronto, Ontario, Canada

    P. C. Lightfoot & W. Doherty

  2. Department of Geology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada

    A. J. Naldrett

  3. Institute of Experimental Mineralogy, USSR Academy of Sciences, 142432, Chernogolovka, Moscow District, USSR

    N. S. Gorbachev

  4. Central Geological Institute, Ministry of Geology, Moscow, USSR

    V. A. Fedorenko

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  1. P. C. Lightfoot
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  2. A. J. Naldrett
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  3. N. S. Gorbachev
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  4. W. Doherty
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  5. V. A. Fedorenko
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Lightfoot, P.C., Naldrett, A.J., Gorbachev, N.S. et al. Geochemistry of the Siberian Trap of the Noril'sk area, USSR, with implications for the relative contributions of crust and mantle to flood basalt magmatism. Contr. Mineral. and Petrol. 104, 631–644 (1990). https://doi.org/10.1007/BF01167284

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