Gold occurrence in Central Italy—the Ponte San Pietro mineralization

Casa, G. De; Manni, Anna Farinacci Riccardo; Saviano, G.; Violo, Maurizio

doi:10.1016/s0169-1368(03)00017-9

Cited by 2 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Melting temperatures of the two phases are commonly measurable in relatively large fluids inclusions, and such measurements can provide the best constraints on the ratios of salts in the inclusion, as described in detail by Sterner et al (1988), Vanko et al (1988) and Steele-MacInnis et al (2011). Estimates of compositional ratios such as w NaCl / (w NaCl + w CaCl2 ) have been made in several studies based on this approach (e.g., Zwart and Touret, 1994;Xu, 2000;de Casa et al, 2003;Kontak and Kyser, 2011;Schlegel et al, 2012).…”

Section: Equilibrium Features Of Ternary Solidus-liquidus Diagramsmentioning

confidence: 99%

Application of low-temperature microthermometric data for interpreting multicomponent fluid inclusion compositions

Steele‐MacInnis

Ridley

Lecumberri-Sánchez

et al. 2016

Earth-Science Reviews

View full text Add to dashboard Cite

Fluid inclusions are commonly the best available source of information on the compositions of fluids in past geologic environments. Microanalytical data, predominantly from LA-ICPMS, allow assessment of the relative abundances of chemical elements in fluid inclusions. Such data show that geologic fluids commonly contain appreciable concentrations of multiple salts in addition to NaCl, particularly KCl, CaCl 2 , and FeCl 2 as major components. Quantification of absolute salt concentrations generally requires an internal standard concentration, which is typically derived from microthermometric measurements interpreted according to the vaporsaturated liquidus relations of simpler systems such as H 2 O-NaCl or H 2 O-NaCl-CaCl 2. Here, we review and reassess compositional information obtainable from microthermometric measurements in multicomponent chloride-dominated aqueous systems. To do so, we investigate the systematics of vapor-saturated liquidus phase equilibria in complex multicomponent electrolyte solutions through thermodynamic modeling based on Pitzer's equations. We focus on low-to intermediate-salinity chloride-dominated inclusions, in which ice is the liquidus phase, and on the temperature range from subsolidus conditions to <25 °C. On the basis of measured ice and hydrohalite melting temperatures, fluids with predominantly monovalent (Na ± K) chlorides, or mixtures of monovalent and divalent cation chlorides can be identified and a robust value of m Na as a proportion of total cations be calculated. We show that microthermometric measurements laone do not allow unequivocal determination of the identity of salts that are present in addition to NaCl. In combination with microanalytical determination of cation ratios, however, robust compositional results for multi-salt aqueous fluid inclusions can be obtained using microthermometric measurements interpreted with generic H 2 O-(Na,K)Cl-ΣX n+ Cl n phase stability relations.

show abstract