Strontium Geochemistry of Modern and Ancient Calcium Sulphate Minerals

Strontium Isotopic Ratios as Fluid Tracers in Messinian Evaporites of the Tyrrhenian Sea (Western Mediterranean Sea)

“…The gypsum samples from Holes 653B and 654A have relatively low Sr contents. The relatively low Sr contents of all the Leg 107 evaporites (410-902 ppm) compared to primary marine anhydrite and gypsum (1500-2300 ppm; Usdowski, 1973;Butler, 1973) suggest chemical re-working of the gypsum with loss of Sr. The values are too low for pristine marine gypsum (Usdowski, 1973), and the high variability of the 87 Sr/ 86 Sr ratios indicates that this reworking did not take place in a fluid with a constant 87 Sr/ 86 Sr ratio.…”

Origin of Dolomite in the Arab-D Reservoir from the Ghawar Field, Saudi Arabia: Evidence from Petrographic and Geochemical Constraints

“…Although it has been suggested that higher salinity fluids will produce dolomites with higher concentrations of Sr (Lucia and Major, 1994) and that mixing-zone dolomites can be distinguished upon the basis of a lower Sr concentration (Major, 1984;Foucke, 1993), the salinity of the fluids per se will not have any influence upon the Sr concentration of the dolomite, unless the fluid has evolved to the point at which the Sr/Ca ratio has been altered. The Sr/Ca ratio of a fluid can be increased as a result of recrystallization of carbonate minerals, gypsum, or anhydrite in a closed system as all these minerals have distribution coefficients less than unity (Veizer, 1983;Butler, 1973). The Sr/Ca ratio of the fluids can decrease through the precipitation of Sr bearing minerals such as celestite.…”

Sedimeitfology, geochemistry and discriminant analysis in the engineering geological investigation of damsites, Lower Gordon Area, Tasmania

“…The amount of Sr in recent hypersaline supratidal dolomite is about 660 ppm (Butler, 1973). The relative amounts of Sr preserved in the Ordovician depositional and early diagenetic facies studied here is the same as in recent sediments.…”