Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone |
| |
| Authors: | Michel Jébrak Charline Lebrun Anne‐Sylvie André‐Mayer Marjorie Simard |
| |
| Institution: | 1. Département des Sciences de la Terre et de l'atmosphère, Université du Québec à Montréal, Montréal, QC, Canada;2. GeoRessources, Université de Lorraine‐CNRS‐CREGU, Vand?uvre‐lès‐Nancy Cedex, France;3. Agnico‐Eagle, division Lapa, Rivière‐Héva, QC, Canada |
| |
| Abstract: | Antimony‐rich gold deposits represent a subclass of orogenic hydrothermal systems. The study of the Lapa gold deposit in the Abitibi greenstone belt shows that antimony occurs during two different stages: (1) as early prograde Sb–Ni disseminated sulphides in talc schists, associated with CO2‐bearing fluids, and (2) as a late native antimony association, associated with methane‐bearing fluids indicating a reducing environment. Methane could be related to the serpentinization of the ultramafic rocks of the Piché Group hosting the Lapa deposit. Several deposits display the same methane antimony association along fault zones. |
| |
| Keywords: | |
|
|
