Fluid-fluid interaction in shallow hydrothermal systems: implications to silica vein textures in epithermal deposits
Epithermal deposits are an important source of precious metals that form at shallow depth by subaerial hydrothermal systems. This study aimed to unravel the processes that result in the formation of high grades in these deposits through textural investigations on epithermal veins.High-grade vein ores in low-, intermediate-, and high-sulfidation epithermal deposits are typically hosted in specific colloform bands. The ore minerals form dendritic aggregates that are hosted by a matrix that originally consisted of opal-A showing a microspherical texture. The opal-A was originally gel-like and could ...
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