Abstract
Geological, petrographic, scanning electron microscopy, and X-ray diffraction studies revealed hydrothermalized lithotypes evidenced by overprinted zones of potassic, propylitic, sericitic, and intermediate argillic alterations types, with pervasive and fracture-controlled styles, in Paleoproterozoic volcano-plutonic units of the São Félix do Xingu region, Amazonian craton, northern Brazil. The Sobreiro Formation presents propylitic (epidote+chlorite+carbonate+clinozoisite+sericite+quartz±albite±hematite±pyrite), sericitic (sericite+quartz+carbonate), and potassic (potassic feldspar+hematite) alterations. The prehnite–pumpellyite pair that is common in geothermal fields also occurs in this unit. The Santa Rosa Formation shows mainly potassic (biotite+microcline±magnetite), sericitic (sericite+quartz+carbonate±chlorite±gold), and intermediate argillic (montmorillonite+kaolinite/halloysite+illite) alterations. These findings strongly suggest the involvement of magma-sourced and meteoric fluids and draw attention to the metallogenetic potential of these volcanic units for Paleoproterozoic epithermal and rare and base metal porphyry-type mineralizations, similar to those already identified in other portions of the Amazonian craton.
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