Complex multiphase fluid inclusions in wollastonite from the Merida contact-metamorphic deposit, Spain; evidence for rock/HCl-rich fluid interaction
Complex multiphase fluid inclusions in wollastonite from the Merida contact-metamorphic deposit, Spain; evidence for rock/HCl-rich fluid interaction (in Fluid inclusions, Carlos Ayora (prefacer))
European Journal of Mineralogy (October 1996) 8 (5): 1015-1026
Progressive decarbonation of marble accompanying the wollastonite-forming reaction gave rise to an aqueous fluid in the NaCl-(KCl)-CaCl (sub 2) -H (sub 2) O system saturated with respect to wollastonite. It continued to precipitate this phase, followed by calcite, probably as a result of changes in the bulk composition; this phase was a CaCl (sub 2) -rich high-salinity brine. A compositional continuum is envisaged between the two fluids, but in both cases the CO (sub 2) content was very low (X approximately 0.05). The inferred high CaCl (sub 2) (and SiO (sub 2(total)) ) contents of the fluid can be explained by the existence of HCl in the primary fluid introduced from the nearby granite.