Sedimentary exhalative deposit (SEDEX)
A stratiform zinc-lead deposit laid down in an extensional sedimentary basin, where metal-bearing brines vent onto or just below the sea floor. The ore forms thin beds interlayered with shales.
Composition
Metals: Zn, Pb, Ag (Ba). Minerals: sphalerite, galena, pyrite, pyrrhotite, barite, in shales that are often organic-rich.
Sources
In the atlas
- Red Dog United States
- McArthur River (HYC) Australia
- Sullivan Canada
- Red Dog (Anarraaq, Wulik) United States
- Langshan China
- Rajpura-Dariba India
- Boliden Sweden
- Aulus-les-Bains district France
- Les Abères (Rivernère valley) France
- Seix France
- Monte Naro Italy