Timing of multiple hydrothermal events in the iron oxide-copper-gold deposits of the Southern Copper Belt, Carajas Province, Brazil

Autor(es)

Moreto, Carolina P. N. ^{[1, 2]} ; Monteiro, Lena V. S. ^[2] ; Xavier, Roberto P. ^[1] ; Creaser, Robert A. ^[3] ; DuFrane, S. Andrew ^[3] ; Melo, Gustavo H. C. ^[1] ; Delinardo da Silva, Marco A. ^[1] ; Tassinari, Colombo C. G. ^[2] ; Sato, Kei ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Geosci Inst, BR-13083970 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Geosci Inst, BR-05508080 Sao Paulo, SP - Brazil

^[3] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3 - Canada

• Tipo de documento: Artigo Científico
• Fonte: MINERALIUM DEPOSITA; v. 50, n. 5, p. 517-546, JUN 2015.
• Citações Web of Science: 27

Resumo

The Southern Copper Belt, Carajas Province, Brazil, hosts several iron oxide-copper-gold (IOCG) deposits, including Sossego, Cristalino, Alvo 118, Bacuri, Bacaba, Castanha, and Visconde. Mapping and U-Pb sensitive high-resolution ion microprobe (SHRIMP) IIe zircon geochronology allowed the characterization of the host rocks, situated within regional WNW-ESE shear zones. They encompass Mesoarchean (3.08-2.85 Ga) TTG orthogneiss, granites, and remains of greenstone belts, Neoarchean (ca. 2.74 Ga) granite, shallow-emplaced porphyries, and granophyric granite coeval with gabbro, and Paleoproterozoic (1.88 Ga) porphyry dykes. Extensive hydrothermal zones include albite-scapolite, biotite-scapolite-tourmaline-magnetite alteration, and proximal potassium feldspar, chlorite-epidote and chalcopyrite formation. U-Pb laser ablation multicollector inductively coupled mass spectrometry (LA-MC-ICP-MS) analysis of ore-related monazite and Re-Os NTIMS analysis of molybdenite suggest multiple Neoarchean (2.76 and 2.72-2.68 Ga) and Paleoproterozoic (2.06 Ga) hydrothermal events at the Bacaba and Bacuri deposits. These results, combined with available geochronological data from the literature, indicate recurrence of hydrothermal systems in the Southern Copper Belt, including 1.90-1.88-Ga ore formation in the Sossego-Curral ore bodies and the Alvo 118 deposit. Although early hydrothermal evolution at 2.76 Ga points to fluid migration coeval with the Carajas Basin formation, the main episode of IOCG genesis (2.72-2.68 Ga) is related to basin inversion coupled with Neoarchean (ca. 2.7 Ga) felsic magmatism. The data suggest that the IOCG deposits in the Southern Copper Belt and those in the Northern Copper Belt (2.57-Ga Salobo and Igarap, Bahia-Alemo deposits) do not share a common metallogenic evolution. Therefore, the association of all IOCG deposits of the Carajas Province with a single extensive hydrothermal system is precluded. (AU)

• Processo FAPESP: 03/01159-1 - Aplicacao de isotopos estaveis na modelagem da genese dos depositos de magnetita-cu-au de igarape bahia e de cu-au-(w-bi-sn) de breves provincia mineral de carajas, pa.
• Beneficiário: Lena Virginia Soares Monteiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 03/11163-6 - Aplicação de isótopos estáveis na modelagem da gênese dos depósitos de magnetita-Cu-Au de Igarapé Bahia e de Cu-Au-(W-Bi-Sn) de breves, Província Mineral de Carajás, PA
• Beneficiário: Lena Virginia Soares Monteiro
• Modalidade de apoio: Auxílio à Pesquisa - Programa Primeiros Projetos
• Processo FAPESP: 09/18371-0 - Geocronologia e geoquímica isotópica aplicadas à evolução metalogenética do Cinturão Sul do Cobre da Província Mineral de Carajás
• Beneficiário: Carolina Penteado Natividade Moreto
• Modalidade de apoio: Bolsas no Brasil - Doutorado