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Minerals 2017, 7(3), 45; https://doi.org/10.3390/min7030045

On the Origin of Bastnaesite-(La,Nd,Y) in the Nissi (Patitira) Bauxite Laterite Deposit, Lokris, Greece

1
Faculty of Geology & Geoenvironment, National and Kapodistrian University of Athens, University Campus Zografou, GR-15784 Athens, Greece
2
School of Mining & Metallurgical Engineering, National Technical University of Athens, 9 Heroon Politechniou St., GR-15773 Zografou, Athens, Greece
*
Author to whom correspondence should be addressed.
Academic Editors: Juan Diego Rodriguez-Blanco and Adrian Jones
Received: 23 November 2016 / Revised: 6 March 2017 / Accepted: 14 March 2017 / Published: 21 March 2017
(This article belongs to the Special Issue Rare-Earth Carbonates)
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Abstract

A detailed geochemical study and a thorough mineralogical description of the rare-earth elements (REE)-minerals and associated minerals were carried out in two vertical profiles of approximately 4 m length, from the Nissi (Patitira) bauxite laterite deposit, Lokris, Greece, characterized by the presence of goethite in small sizes resembling bacterial cell coated by goethite and a significant REE enrichment. The enrichment of the REE concentrated in bastnaesite-group minerals, the intergrowths between REE-minerals and Al–Ni–silicates with significant sulfur contents and their association with goethite microtextures interpreted as bacteriomorphic, indicate REE remobilization along with iron bio-leaching and re-precipitation on karstified limestone. In addition to the previous-reported hydroxylbastnaesites, a (La,Nd,Y)(CO3)F member of the bastnaesite-group associated with Al–Ni–silicates were identified, the stability of which may reflect the dependence on the source rocks and the local variations of pH-Eh. Interaction between downward percolating water and carbonate rocks seems to be a very effective mechanism for REE fluorocarbonates deposition under alkaline and reducing conditions. View Full-Text
Keywords: rare-earth elements (REE); bastnaesite; karstic Fe–Ni–laterites; bauxite laterites; Lokris; Greece rare-earth elements (REE); bastnaesite; karstic Fe–Ni–laterites; bauxite laterites; Lokris; Greece
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Kalatha, S.; Perraki, M.; Economou-Eliopoulos, M.; Mitsis, I. On the Origin of Bastnaesite-(La,Nd,Y) in the Nissi (Patitira) Bauxite Laterite Deposit, Lokris, Greece. Minerals 2017, 7, 45.

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