Origin of major karst-associated celestite mineralization in Karstryggen, central East Greenland

Celestite replaces calcite, dolomite and gypsum in the algally laminated limestone and constitutes the last diagenetically precipitated mineral phase found in these sediments. However, all other diagenetic products are of very early, near surface origin, weakening the evidence for the timing of the replacement. In the karstified limestone conglomerate/breccia sequence, mineralization occurs as a replacement of algally laminated limestone clasts, as celestite cement in the karst breccias, and as pockets, lenses and veins of celestite-filled karst fractures and caves. The localized (tectonically controlled) gypsum basin provided a source of sulfur, whereas early karstification enhanced porosity of the limestones and provided important permeability conduits for subsequent mineralization. -from Authors