Paleoproterozoic volcanic centers of the São Félix do Xingu region, Amazonian craton, Brazil: Hydrothermal alteration and metallogenetic potential

Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits

“…In the intermediate-sulfidation deposits, these data suggest primary neutralization [96,106] of the original acid magmatic fluid by reaction with the host rocks during the migration around the magmatic intrusion, followed by mixing with meteoric fluids. Low-sulfidation gold epithermal occurrences associated with the tardi-to post-orogenic to A-type magmatism may also be related to alkalic epithermal systems in the São Félix do Xingu area, east of the TMP [32].…”

“…The discovery of a well-preserved high-sulfidation epithermal gold mineralization associated with 1.88 Ga calc-alkaline volcanic rocks by Rio Tinto company [12][13][14][15][16] and porphyry-like gold systems [17][18][19][20] opened the possibility for the occurrence of large Paleoproterozoic gold and Cu-Mo deposits in both provinces, as proposed by [21]. In the following years, due to academic research and mineral exploration programs, several epithermal (low-, intermediate-and high-sulfidation) occurrences related to calc-alkalic and alkalic porphyry-like mineralization, sometimes with Au, Cu or Mo, were identified in both provinces [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. This expands the perspectives for the existence of magmatichydrothermal high-grade epithermal and large porphyry-like deposits.…”

Petrogênese e metalogenia do magmatismo Paleoproterozoico na porção sul da Proví­ncia Mineral do Tapajós, Crá¡ton Amazônico

“…Após os estudos apresentados por Juliani et al (2005), inúmeras outras ocorrências de alterações hidrotermais do tipo epitermal têm sido descritas na Província Mineral do Tapajós, no vale do rio Iriri e nos arredores de São Felix do Xingu Juliani et al, 2013b;Echeverri-Misas, 2010;2015;Aguja-Bocanegra, 2013;Tokashiki, 2015a;Cassini et al, 2015;Gómez-Gutiérrez et al, 2015a;Da Cruz et al, 2016;Fernandes et al, 2006;Fernandes, 2009) Alteração argílica sobreposta à alteração sericítica foi reconhecida em rochas ígneas e vulcanoclásticas, incluindo rochas plutônicas, hipoabissais, vulcânicas, piroclásticas e vulcânicas epiclásticas nas circunvizinhanças das rochas com alteração potássica.…”