Abstract
Beds, fissures and joints filled with coarse sparitic gypsum were found associated with the upper layers of chalks of Eocene age in the Beer Sheva region in southern Israel. The average 34S(SO 4) value of the gypsum is + 15‰, which signifies an evaporitic origin. Field observations show that the veins are connected with the loess-soil cover (of Upper Pleistocene age) which overly the chalks. The deposition of the gypsum is suggested to be through a process of leaching from the loess during a more humid period, its concentration (possibly by roots of sulfate tolerant trees) and its deposition from groundwater which became over-saturated with CaSO 4. The high contents of sulfate in the loess is explained by the special climatic conditions which prevailed during the Uppermost Pleistocene and which were characterized by sulfate-rich dust- and rainstorms.
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