Physics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.2849b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 61, Issue 14, pp.2849-2854
Physics
6
Scientific paper
Experiments were conducted to assess Br/Cl fractionatiodn during phase separation of seawater at 400°C and 250 to 275 bars. These conditions are applicable to the 9-10°N EPR system where low Cl concentrations and low Br/Cl rations in vent fluids have been attributed to phase separation of seawater at conditions below the critical point of seawater (408°C, 300 bars). The level of Br/Cl fractionation observed in experiments is well below that needed to account for Br/Cl systematics at EPR 9-10°N. Based on our experimental results, we propose an alternative model involving dissolution and precipitation of halite to account for the anomalous Br/Cl data at 9-10°N. Halite can be predicted to form at pressure and temperature conditions prevailing during eruption of magma at mid-ocean ridges. Subsequent changes in physical conditions, however, would induce halite to dissolve, and thus, decrease Br/Cl ratios of vent fluids.
Berndt Michael E.
Seyfried William E. Jr.
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