Physics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..42...98d&link_type=abstract
Earth and Planetary Science Letters, Volume 42, Issue 1, p. 98-102.
Physics
Scientific paper
Gypsum and halite crystals, together with saponite and phillipsite, were found in a vein in a basalt sill 625 m below the sea floor at DSDP Site 395A, located 190 km west of the crest of the Mid-Atlantic Ridge. The δ 34S value of the gypsum (+19.4‰) indicates a seawater source for the sulfate. The δ 18O values of the saponite (+19.9‰) and phillipsite (+18.1‰) indicate either formation from normal seawater at about 55°C or formation from 18O-depleted seawater at a lower temperature. The gypsum (which could be secondary after anhydrite) was formed by reaction between Ca2+ released from basalt and SO42- in circulating seawater. The halite could have formed when water was consumed by hydration of basalt under conditions of extremely restricted circulation. A more probable mechanism is that the gypsum was originally precipitated as anhydrite at temperatures above 60°C. As the temperature dropped the anhydrite converted to gypsum. The conversion would consume water, which could cause halite precipitation, and would cause an increase in the volume of solids, which would plug the vein and prevent subsequent dissolution of the halite.
Antweiler Ronald C.
Drever James I.
Lawrence James R.
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