Abstract
Geochemistry of Calcium Sulphate Rocks of Fat`ha Formation atFour Localities within Nineveh District, Northern Iraq(with emphasis on strontium distribution)
Highlights
Strontium distribution within (90) calcium sulphate samples (20 anhydrite, 25 massive gypsum, 25 selenite and 20 fibrous gypsum) from Fat'ha Formation (Middle Miocene) at four selected localities in northern Iraq were investigated
There is a loss of (182 ppm, 15.58%) of strontium in the resulting gypsum. This loss is attributed to the incapability of monoclinic structure of gypsum to hold all the released strontium
Massive gypsum contains almost twice and (3.46) times strontium as selenite and fibrous gypsum respectively
Summary
The oxides (CaO, SO3, MgO and SiO2) and the trace elements (Al, K, Fe and Sr) were analyzed using a Philips (PW 1450) X-ray spectrometer using the pressed powder pellet method (Norrish and Hutton, 1964; Leake et al, 1969). The ratio of (SiO2/CaO) at the four localities for the four types of calcium sulphate is about (0.004) (Table4) indicating that anhydrite and gypsum of the present study contain similar amounts of clay minerals and quartz as impurities. It is rather low at Batnaya selenite (0.49) and Mosul Dam anhydrite (0.62); higherb at Shaikh Ibrahim and Batnaya massive gypsum (0.80 and 0.96 respectively) and considerably higher at the other localities with other types of calcium sulphate (Table4) These variations reflect the mobile nature of potassium and its possible prescence in the chemical fraction, as well as in the detrital fraction within the clay minerals. It is possible to calculate strontium concentration in any of the three forms of gypsum, from crystal size
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