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Anhydrite solubility in H 2 O–NaCl solutions was measured at 6–14 kbar, 600–800°C and NaCl mole fractions ( X  NaCl ) of 0–0·3 in piston–cylinder apparatus. Solubilities were determined by weight changes of natural anhydrite in perforated Pt envelopes confined with fluid in larger Pt capsules. In initially pure H 2 O at 10 kbar and 800°C, CaSO 4  concentration is low (0·03 molal), though much larger than at the same temperature and 1 kbar. Hematite-buffered experiments showed slightly lower solubilities than unbuffered runs. CaSO 4  solubility increases enormously with NaCl activity: at 800°C and 10 kbar and  X  NaCl  of 0·3, CaSO 4  molality is 200 times higher than with pure H 2 O. Whereas CaSO 4  solubility in pure H 2 O decreases with rising  T  at low  T  and  P , the high- P  results show that anhydrite solubility increases with  T  at constant  P  at all X NaCl  investigated. The effects of salinity and temperature are so great at 10 kbar that critical mixing between sulfate-rich hydrosaline melts and aqueous salt solutions is probable at 900°C at X NaCl  ≤ 0·3. Recent experimental evidence that volatile-laden magmas crystallizing in the deep crust may evolve concentrated salt solutions could, in light of the present work, have important implications regarding such diverse processes as Mount Pinatubo-type S-rich volcanism, high- f  O 2  regional metamorphism, and emplacement of porphyry Cu–Mo ore bodies, where anhydrite–hematite alteration and fluid inclusions reveal the action of very oxidized saline solutions rich in sulfur.

Solubility of Anhydrite, CaSO 4 , in NaCl–H 2 O Solutions at High Pressures and Temperatures: Applications to Fluid–Rock Interaction