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GENESIS OF A CELESTINE DEPOSIT WITH REFERENCE TO ITS GEOLOGICAL CHARACTERISTCS

Yang Qingtang (MCI Geological Institute for Chemical Minerals)  
A sedimentary celestine deposit has a close link with evaporite sediments, particularly associated with gypsum phase, with the ore hosting rocks prodominated by laminated stromatolite and algal limestone.Compositions of S and Sr isotopes for celestine are similar to those for general sea waters. On sea water evaporation until a critical concentration, or, alternatively, reaction of Sr rich,sulfate type,intercrystalline brine with carbonate may form respectively sedimentary and metasomatic celestines.This bi genetic mineral distributes essentially on marginal parts of evaporitic basins in transpositional zones of carbonate facies to sulfate one.
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