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Mineralium Deposita

, Volume 52, Issue 8, pp 1205–1222 | Cite as

Formation of Si-Al-Mg-Ca-rich zoned magnetite in an end-Permian phreatomagmatic pipe in the Tunguska Basin, East Siberia

  • Else-Ragnhild NeumannEmail author
  • Henrik H. Svensen
  • Alexander G. Polozov
  • Øyvind Hammer
Article

Abstract

Magma-sediment interactions in the evaporite-rich Tunguska Basin resulted in the formation of numerous phreatomagmatic pipes during emplacement of the Siberian Traps. The pipes contain magnetite-apatite deposits with copper and celestine mineralization. We have performed a detailed petrographic and geochemical study of magnetite from long cores drilled through three pipe breccia structures near Bratsk, East Siberia. The magnetite samples are zoned and rich in Si (≤5.3 wt% SiO2), Ca, Al, and Mg. They exhibit four textural types: (1) massive ore in veins, (2) coating on breccia clasts, (3) replacement ore, and (4) reworked ore at the crater base. The textural types have different chemical characteristics. “Breccia coating” magnetite has relatively low Mg content relative to Si, as compared to the other groups, and appears to have formed at lower oxygen fugacity. Time series analyses of MgO variations in microprobe transects across Si-bearing magnetite in massive ore indicate that oscillatory zoning in the massive ore was controlled by an internal self-organized process. We suggest that hydrothermal Fe-rich brines were supplied from basalt-sediment interaction zones in the evaporite-rich sedimentary basin, leading to magnetite ore deposition in the pipes. Hydrothermal fluid composition appears to be controlled by proximity to dolerite fragments, temperature, and oxygen fugacity. Magnetite from the pipes has attributes of iron oxide-apatite deposits (e.g., textures, oscillatory zoning, association with apatite, and high Si content) but has higher Mg and Ca content and different mineral assemblages. These features are similar to magnetite found in skarn deposits. We conclude that the Siberian Traps-related pipe magnetite deposit gives insight into the metamorphic and hydrothermal effects following magma emplacement in a sedimentary basin.

Keywords

Si-bearing magnetite Siberian Traps Phreatomagmatic pipe Evaporite Oscillatory zoning 

Notes

Acknowledgements

We gratefully acknowledge financial support from the Norwegian Research Council via SFF grants to PGP and CEED (grant number 223272) and a grant to H. Svensen (EPIC). We thank Kirsten E. Fristad and Sverre Planke for discussions and support during fieldwork in Siberia, Muriel Erambert for her assistance during EMP analyses, and Stephane Polteau and Clement Ganino for their work on-site when logging and sampling the S26 core. The manuscript has improved significantly through constructive criticism and suggestions from Charley Duran and an anonymous reviewer.

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Else-Ragnhild Neumann
    • 1
    Email author
  • Henrik H. Svensen
    • 1
  • Alexander G. Polozov
    • 1
    • 2
  • Øyvind Hammer
    • 3
  1. 1.Centre for Earth Evolution and Dynamics, Department of GeosciencesUniversity of OsloOsloNorway
  2. 2.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and GeochemistryRussian Academy of SciencesMoscowRussia
  3. 3.Natural History MuseumUniversity of OsloOsloNorway

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