Skip to Main content Skip to Navigation
Journal articles

Metal mobility during hydrothermal breakdown of Fe-Ti oxides: insights from Sb-Au mineralizing event (Variscan Armorican Massif, France)

Abstract : 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 hydrothermal 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [57 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01624548
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, October 26, 2017 - 2:05:41 PM
Last modification on : Wednesday, September 23, 2020 - 4:36:04 AM
Long-term archiving on: : Saturday, January 27, 2018 - 2:48:49 PM

File

pochon-2017.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Anthony Pochon, Georges Beaudoin, Yannick Branquet, Philippe Boulvais, Eric Gloaguen, et al.. Metal mobility during hydrothermal breakdown of Fe-Ti oxides: insights from Sb-Au mineralizing event (Variscan Armorican Massif, France). Ore Geology Reviews, Elsevier, 2017, 91, pp.66-99. ⟨10.1016/j.oregeorev.2017.10.021⟩. ⟨insu-01624548⟩

Share

Metrics

Record views

305

Files downloads

597