Geology of Ore Deposits

, Volume 56, Issue 4, pp 239–256 | Cite as

Structure, age, and ore potential of the Burpala rare-metal alkaline massif, northern Baikal region

  • N. V. Vladykin
  • I. A. Sotnikova
  • A. B. Kotov
  • V. V. Yarmolyuk
  • E. B. Sal’nikova
  • S. Z. Yakovleva
Article

Abstract

The Burpala alkaline massif is a unique geological object. More than 50 Zr, Nb, Ti, Th, Be, and REE minerals have been identified in rare-metal syenite of this massif. Their contents often reach tens of percent, and concentrations of rare elements in rocks are as high as 3.6% REE, 4% Zr, 0.5% Y, 0.5% Nb, 0.5% Th, and 0.1% U. Geological and geochemical data show that all rocks in the Burpala massif are derivatives of alkaline magma initially enriched in rare elements. These rocks vary in composition from shonkinite, melanocratic syenite, nepheline and alkali syenites to alaskite and alkali granite. The extreme products of magma fractionation are rare-metal pegmatites, apatite-fluorite rocks, and carbonatites. The primary melts were related to the enriched EM-2 mantle source. The U-Pb zircon ages of pulaskite (main intrusive phase) and rare-metal syenite (vein phase) are estimated at 294 ± 1 and 283 ± 8 Ma, respectively. The massif was formed as a result of impact of the mantle plume on the active continental margin of the Siberian paleocontinent.

Keywords

Nepheline Rare Metal Nepheline Syenite Aegirine Alkali Granite 

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • N. V. Vladykin
    • 1
  • I. A. Sotnikova
    • 1
  • A. B. Kotov
    • 2
  • V. V. Yarmolyuk
    • 3
  • E. B. Sal’nikova
    • 2
  • S. Z. Yakovleva
    • 2
  1. 1.Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia
  2. 2.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia
  3. 3.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and GeochemistryRussian Academy of SciencesMoscowRussia

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