Journal
ORE GEOLOGY REVIEWS
Volume 91, Issue -, Pages 66-99Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.oregeorev.2017.10.021
Keywords
Emenite-titanohematite hydrothermal breakdown; Sb mineralization; EPMA; LA-ICP-MS; Redistribution of trace elements; Hydrothermal alteration; Rutile
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Funding
- Bureau de Recherches Geologiques et Minieres (BRGM)
- region of Brittany
- Observatoire des Sciences de l'Univers de Rennes (OSUR)
- doctoral school Sciences de la Matiere (SDLM)
- Ministere de 1'Energie et des Ressouces naturelles of Quebec
- Natural Sciences and Engineering Research Council of Canada
- Agnico Eagle Mines
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Hydrothermal alteration related to Sb-Au mineralization is widespread in the Variscan Armorican Massif, but mineral replacement reactions are not well characterized, in particular the hydrothermal breakdown of ilmenite-titanohematite. Based on petrography, electron probe micro-analyzer and laser ablation-inductively coupled plasma-mass spectrometer analyses, we document mineralogical change at rock- and mineral-scale and the redistribution of Sb and others trace elements during the recrystallization of ilmenite-titanohematite to hydro thermal rutile. Hydrothermal alteration is mainly potassic with associated carbonation. The replacement mechanism is interpreted to be an interface-coupled dissolution-reprecipitation process. Results show that Mn, Zn, Co, Ni, Sn, Mo and U are released during hydrothermal alteration, whereas Sb and W are incorporated in newly formed hydrothermal rutile from the hydrothermal fluid. Furthermore, the concentration of Sb evolves through time suggesting a change in fluid composition likely related to an enrichment of fluid in Sb during rutile crystallization. Considering that Fe-Ti oxides breakdown during hydrothermal alteration is common within epithermal and mesothermal/orogenic Au-Sb mineralizing systems, results report in this study yield important constraints about metal mobility and exchanges in hydrothermal gold systems.
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