Article révisé par les pairs
Résumé : A mineralized horizon occurs at 1595 m depth in the borehole of Loenhout, Belgium. The host rock is a vesicular, fractured, siliceous dolomite and contains marcasite, pyrite, bravoite, sphalerite and chalcopyrite. Quartz is non-detrital and the sulphides show diagenetic growth. The mineralization is located in a back-reef environment.-R.V.T. Service geologique de Belgique, 13 rue Jenner, B-1040 Bruxelles, Belgium.