Pb-Zn-Ag-bearing manganoan skarns of China ― A further discussion

摘要

Manganoan skarns consist of special Mn (Ca, Mg, Fe, Al) silicate metasomatic minerals and are usually associated with Pb-Zn (Ag) mineralization. They occur chiefly along the lithologic contacts or faults and fractures of carbonate wall rocks distal from the intrusive contact zone, and regionally associated with Fe, Cu, W, Sn and Cu-bearing calcic or magnesian skarns occurring in the contact zones to constitute certain metasomatic zoning. Manganoan skarns formed paragenetically later than related calcic or magnesian skarns, and at lower temperatures. The mineral assemblages of manganoan skams occurring in different carbonate rocks (limestone or dolomite) are notably different.