Thus, the data indicate that propylitic alteration halos are produced by extensive lateral dispersion of magmatic-hydrothermal fluids derived from the mineralising intrusions. This is consistent with thermodynamic models involving fluid cooling and fluidrock interaction (Reed et al. 2013) but not with numerical models of fluid flow (Weis et al. 2012). Possible reasons to explain this contradiction and implications for exploration within propylitic domains for buried porphyry deposits are considered.
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