In the world of VMS stratigraphy and deposits, chemical effects near mineralization produce major magnifications and diminutions in the abundances of various elements. However, some of these effects are 'illusory' in the sense that immobile elements which appear to increase or decrease, such as Al and Ti, in fact go nowhere. In the example shown, which is for altered rhyolites at a VMS prospect, silica additions and depletions are mainly responsible for the large apparent changes in Al and Ti values from precursor composition (shown by the whited dot).

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