Other
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..607m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 2, pp.607-616
Other
21
Scientific paper
Chlorine solubility in silicate melts has been investigated at 830-850 ± 5° C and at pressures ranging from 50 to 200 MPa, using both natural (pantellerite, rhyolite, phonolite) and synthetic (SiO 2 -Al 2 O 3 -K 2 O-Na 2 O) compositions and a stated H 2 O-NaCl-KCl fluid phase near 4 molal. At 100 MPa, Cl contents in pantelleritic melts reach a solubility plateau at initial aqueous phase molality near 2. This plateau coincides with a large immiscibility gap between aqueous and chloride-rich fluids. With the coexisting Cl-saturated aqueous phase, Cl ranges from 2720 ± 120 ppm in rhyolite to 8960 ± 85 ppm in pantellerite and reaches 6270 ± 170 ppm in phonolite, at 100 MPa. Between 50 and 200 MPa, the Cl content in pantelleritic melt decreases from 9640 ± 200 ppm to 5040 ± 150 ppm. Although Cl solubility increases with increasing FeO * in high SiO 2 melts, it is mainly controlled by the Al / Si and ( Na + K )/ Al molar ratios of the melt with a minimum at Na + K / Al = 1 in a series of synthetic rhyolitic to pantelleritic melts. The experimental results suggest that chlorine occurs as alkali-chloride complexes in high SiO 2 melts. They also indicate that Cl is concentrated in the aqueous fluids in equilibrium with SiO 2 -rich melts, the exact value of D depending on melt composition and melt chlorine concentration. Volcanic degassing will create chlorine-rich hydrothermal fluids and decrease chlorine melt content.
Métrich Nicole
Rutherford Malcolm J.
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