Spectra and coordination changes of transition metals in hydrothermal solutions: Implications for ore genesis

Details Spectra and coordination changes of transition metals in hydrothermal solutions: Implications for ore genesis Spectra and coordination changes of transition metals in hydrothermal solutions: Implications for ore genesis

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..555s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 2, pp.555-564

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8

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Optical absorption spectra of Fe(II), Co(II), Ni(II) and Cu(II) have been measured in aqueous solutions of up to 5 m NaCl at temperatures from 25°C to 300°C and at water-saturated vapor pressures. Ni and Co complexes exhibited a change from octahedral to tetrahedral coordination, this occurring at both higher temperatures and Cl - concentrations. Similar transitions to lower coordination number are predicted for Cu and Fe but were not directly observed because of interference with water overtone bands. The coordination changes in response to ligand type and concentration, pressure and temperature. Formation of lower coordination complexes is attributed to the decreased dielectric constant of the solvent, the predominance of electrostatic forces and a decrease in the octahedral site preference energy at elevated temperatures. Our data suggest that lower coordination complexes with lower or neutral formal charge, will result in minerals having a higher solubility. The molecular properties and changes in coordination of these complexes are important in determining the transport and deposition of hydrothermal minerals.

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