The stratiform fluorite deposits of Morvan, south east Paris basin, France.

Stratiform fluorite mineralisation occurs at the base of the transgressive Mesozoic cover to the Hercynian basement, which, in the area discussed, forms a horst. Proven reserves are 13 million tonnes of ore at 32-40% CaF2. The mineralisation occurs at the former content-basin limit, is limited stratigraphically by the presence of impermeable horizons above and below to the Trias to Sinemurian rocks, includes baryte as well as traces of galena, sphalerite and chalcopyrite, and is associated with silicification of the sediments and synsedimentary feacturing. Leaching by brines of flurorine and silica-rich argillaceous sediments is thought to have contributed to the genesis of the deposits.
Stratiform fluorite mineralisation occurs at the base of the transgressive Mesozoic cover to the Hercynian basement, which, in the area discussed, forms a horst. Proven reserves are 13 million tonnes of ore at 32-40% CaF2. The mineralisation occurs at the former content-basin limit, is limited stratigraphically by the presence of impermeable horizons above and below to the Trias to Sinemurian rocks, includes baryte as well as traces of galena, sphalerite and chalcopyrite, and is associated with silicification of the sediments and synsedimentary feacturing. Leaching by brines of flurorine and silica-rich argillaceous sediments is thought to have contributed to the genesis of the deposits.