Organics will interfere with the measurement of some halogens. This is achieved by ashing the sample under controlled conditions. Vegetation, soil and sediment samples for super trace halogen analysis require pre-treatment to remove the organic component from samples. Evidence from contemporary active hydrothermal systems clearly show the association between elevated halogens and metals (Trofimov, and Rychkov, 2004). Halides are known to be important complexing agents for metals, enhancing their concentration and transport in hydrothermal solutions prior to eventual deposition (Wilkinson, J.J., 2001 Trofimov, and Rychkov, 2004). An example from the Kristineberg volcanogenic massive sulphide district, Sweden, shows high fluorine in muscovite and phlogopite associated with mineralisation (Hannington et al., 2003). Halogens are also commonly found in the crystal structure of alteration facies minerals that develop during hydrothermal alteration. Fluid inclusions are preserved bubbles of the mineralising hydrothermal fluids, and show that high concentrations of halogens were present to support the transportation of metals in fluids (Yardley et. Halogens are found in fluid inclusions from many deposit types. Consequently, halogens can be indicative of the presence of ore systems where they are found in anomalously high concentrations. A significant body of evidence demonstrates that halogens play an important role in ore deposit formation.
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