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Results and Interpretation

The goal of this study was to examine possible correlations between precious

metal mineralization and evidence for boiling along the Veta Madre at Guanajuato,

Mexico, and to develop a tool that could be used to evaluate the economic potential of

epithermal systems. As noted above, several mineral textures observed in this study,

including jigsaw texture silica (Fig. 7A), feathery silica (Fig. 7B), flamboyant texture

silica (Fig. 7C), plumose texture silica (Fig. 7D), lattice bladed calcite (Fig. 7F),

colloform texture silica (Fig. 7G), colloform banded plumose texture silica (Fig. 7H),

colloform banded jigsaw texture silica (Fig. 7I), crustiform quartz (Fig. 7L), moss texture

silica (Fig. 7N), pseudo-acicular texture silica after calcite (Fig. 7P), lattice-bladed calcite

replaced by quartz (Fig. 6Q), ghost-sphere texture silica (Fig. 7R), suggest rapid

precipitation as a result of boiling. In addition, the presence of coexisting liquid-rich and

vapor-rich fluid inclusions in the same FIA indicates that the inclusions were trapped in a

boiling fluid.

For each of the 855 samples examined, a numerical value was assigned for each

mineral texture and fluid inclusion feature described above. A value of 0 (zero) was

assigned if a given feature was not observed during petrographic examination of the

sample, and a value of 1 (one) was assigned if the feature was observed. The number of

observations for each of the boiling features is summarized in Figure 9. Jigsaw texture

quartz was observed in nearly every sample (752 of 855 samples). Plumose texture

quartz, also referred to as feathery or flamboyant texture quartz in the literature, occurs in

549 samples, colloform texture silica, including colloform banded plumose and colloform


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