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Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil

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 Bo...

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Main Authors: Hühn, Sérgio Roberto Bacelar, Silva, Adalene Moreira
Format: Artigo
Language: English
Published: Sociedade Brasileira de Geologia 2019
Subjects:
Cobre
Óxidos
Cisalhamento
Lógica difusa
Rio Grande do Norte
Online Access: http://repositorio.unb.br/handle/10482/33723
http://dx.doi.org/10.1590/2317-4889201820180029
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spelling ir-10482-337232019-02-27T11:08:50Z Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil Hühn, Sérgio Roberto Bacelar Silva, Adalene Moreira Cobre Óxidos Cisalhamento Lógica difusa Rio Grande do Norte 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. 2019-01-02T13:57:41Z 2019-01-02T13:57:41Z 2018 Artigo 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. http://repositorio.unb.br/handle/10482/33723 http://dx.doi.org/10.1590/2317-4889201820180029 en Acesso Aberto This is an open access article distributed under the terms of the Creative Commons license. (CC BY) application/pdf Sociedade Brasileira de Geologia
institution REPOSITORIO UNB
collection REPOSITORIO UNB
language English
topic Cobre
Óxidos
Cisalhamento
Lógica difusa
Rio Grande do Norte
spellingShingle Cobre
Óxidos
Cisalhamento
Lógica difusa
Rio Grande do Norte
Hühn, 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
description 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.
format Artigo
author Hühn, Sérgio Roberto Bacelar
Silva, Adalene Moreira
author_sort Hühn, Sérgio Roberto Bacelar
title Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil
title_short Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil
title_full Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil
title_fullStr Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil
title_full_unstemmed Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil
title_sort favorability potential for iocg type deposits in the riacho do pontal belt: new insights for identifying prospects of iocg-type deposits in ne brazil
publisher Sociedade Brasileira de Geologia
publishDate 2019
url http://repositorio.unb.br/handle/10482/33723
http://dx.doi.org/10.1590/2317-4889201820180029
_version_ 1641988213420589056
score 13.657419

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