Articles | Volume 33, issue 5
Eur. J. Mineral., 33, 605–620, 2021
Eur. J. Mineral., 33, 605–620, 2021

Research article 06 Oct 2021

Research article | 06 Oct 2021

Authigenic rhabdophane from brown iron ore of the oxidation zone of the Babaryk massive sulfide occurrence (South Urals): scanning electron microscope (SEM) and electron backscattered diffraction (EBSD) study

Elena V. Belogub et al.

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Cited articles

Abedini, A., Asghar Calagari, A., and Masoumi R.: Investigation of mineralogy and geochemistry of kaolin deposit in Kejal area, northwest of Hastjin, Ardebil province, MSc thesis, University of Tabriz, Tabriz, Iran, J. Econ. Geol., 3, 27–35, 2011–2012. 
Belogub, E. V.: The mineralogy of alunite-jarosite group in supergene zone of massive suphide deposits of South Urals (Russia), Reunion des Sciences de la Terre 17, Brest: sous l egide de la Societe Geologique de France, 2–4 July, 72 pp., 1998. 
Berger, A., Gnos, E., Janots, E., Fernandez, A., and Giese, J.: Formation and composition of rhabdophane, bastnasite and hydrated thorium minerals during alteration: Implications for geochronology and low-temperature processes, Chem. Geol., 254, 238–248,, 2008. 
Berger, A., Janots, E., Gnos, E., Frei, R., and Bernier, F.: Rare earth element mineralogy and geochemistry in a laterite profile from Madagascar, Appl. Geochem., 41, 218–228,, 2014. 
Borst, A., Smith, M., Finch, A., Estrade, G., Villanova-de-Benavent, C., Nason, P., Marquis, E., Horsburgh, N., Goodenough, K., Xu, Ch., Kynický, J., and Geraki, K.: Adsorption of rare earth elements in regolith-hosted clay deposits, Nat. Commun., 11, 4386,, 2020. 
Short summary
We found Ca- and S-rich rhabdophane in the upper part of the oxidation zone of a sulfide occurrence, where it forms spherules up to 35 µm in size and aggregates in fractures in goethite. Its formation is probably associated with desorption of REEs from Fe3+ oxyhydroxides and clay minerals in the oxidation zone and the influx of P from the soil as well as from the precursor rocks. The enrichment with REE phosphate in the studied case is similar to that in REE regolith-hosted deposits.