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Petrology

, Volume 27, Issue 1, pp 79–94 | Cite as

Genesis of Manganese Ore Occurrences of the Olkhon Terrane the Western Baikal Region

  • E. V. SklyarovEmail author
  • A. V. LavrenchukEmail author
  • A. E. Starikova
  • V. S. FedorovskyEmail author
  • E. A. KhromovaEmail author
Article
  • 3 Downloads

Abstract

Geological and mineralogical data are reported on the manganese occurrences of the Olkhon terrane (Western Baikal region), which are localized in metadolerites of the Ustkrestovsky Complex, high-temperature mafic hornfels, granites, calcitic marbles and calciphyres, and occasionally are developed as separate veins in gneiss granites or small lenses in quartzites. Most of them are made up of high-temperature mineral assemblages (Opx + Cpx + Pl + Ilm ± Grt ± Bt ± Amp), the main manganese carriers in which are ferrorhodonite (33–36 wt % MnO), orthopyroxene (6–12 wt % MnO), and ilmenite (3–16 wt % MnO). Obtained data are in conflict with traditional concepts that these rocks are gondites (manganese-rich metamorphosed sediments) or that manganese flux in carbonate sediments was related to the volcanic activity that occurred simultaneously with sedimentation at about 500 Ma. The diversity of manganese occurrences was produced by metasomatic processes that occurred almost simultaneously with regional metamorphism and emplacement of subalkaline mafic bodies during collisional tectonogenesis (about 470 Ma).

Keywords:

manganese occurrences metasomatism metamorphism Olkhon terrane Western Baikal region 

Notes

ACKNOWLEDGMENTS

Geological study and sampling of manganese occurrences were supported by the Russian Foundation for Basic Research (project no. 16-05-00202), while mineralogical studies were supported by the Russian Science Foundation (project no. 16-17-10180).

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesIrkutskRussia
  2. 2.Far East Federal UniversityVladivostokRussia
  3. 3.Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesNovosibirskRussia
  4. 4.Novosibirsk State UniversityNovosibirskRussia
  5. 5.Geological Institute of the Russian Academy of SciencesMoscowRussia
  6. 6.Geological Institute, Siberian Branch of the Russian Academy of SciencesUlan-UdeRussia

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