Título:	Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil
Autor(es):	Hühn, Sérgio Roberto Bacelar Silva, Adalene Moreira
Assunto:	Cobre Óxidos Cisalhamento Lógica difusa Rio Grande do Norte
Data de publicação:	2018
Editora:	Sociedade Brasileira de Geologia
Referência:	HUHN, Sérgio Roberto Bacelar; SILVA, Adalene Moreira. Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil. Brazilian Journal of Geology, São Paulo, v. 48, n. 4, p. 703-719, out./dez. 2018. DOI: http://dx.doi.org/10.1590/2317-4889201820180029. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000400703&lng=en&nrm=iso. Acesso em: 27 fev. 2019.
Abstract:	Archean iron oxide-copper-gold (IOCG) deposits have been systematically described in the world class Carajás IOCG district, Amazonian region of Brazil. More recently, several Neoproterozoic (ca 1.13 to 0.96 Ga) IOCG deposits have been identified in the Riacho do Pontal mobile belt situated in the Borborema Province on the northern border of the São Francisco Craton. In these Neoproterozoic deposits, several copper occurrences have been mapped along shear zones. The primary hydrothermal mineral associations resulted in sodic, calcic-potassic and potassic-ferric alteration. The copper grades of the main prospects range between 0.5 and 0.8 wt% with an average of ~0.7 wt%. This study uses a fuzzy logic approach to create regional to district scale predictive exploration models. Specifically, multi-parameter geologic, geochemical, remote sensing, and airborne geophysical data incorporated into regional and local models predict known copper mineralization and, importantly, highlight prospective areas for new IOCG targets in the Borborema Province. At district scale, multiple higher resolution geological, soil geochemical, and airborne geophysical data that cover the Riacho do Pontal Belt, were analyzed. A drilling exploration program implemented on target RIA4 validated these model results. Drill hole RIA4-DH0001 crosscuts a mineralized zone with 32 m of 1.15 wt% copper.
Licença:	This is an open access article distributed under the terms of the Creative Commons license. (CC BY)
DOI:	http://dx.doi.org/10.1590/2317-4889201820180029
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