US EPA

7465076 

Book/Book Chapter 

The IOA type occurrences of the Neoproterozoic Santa Quiteria magmatic arc, Borborema Province, northeast Brazil 

Vaz Parente, C; Vieira Verissimo, CU; de Oliveira Lino, R; Araújo da Silva, CD; Perez Xavier, R; Francisquini Botelho, N 

2017 

Society for Geology Applied to Mineral Deposits 

Québec City, QC 

Mineral resources to discover: Proceedings. Volume 3 

951-954 

English 

WOS:000439764100235 

IOA (iron oxide-apatite) and IOCG (iron oxide-copper-gold) deposits are known in all continents. In Brazil, records of these deposits, particularly of the IOCG-type, have been restricted to the Carajas Mineral Province, while the IOA types were unknown. However, important occurrences of Fe-P (+/- Cu) have also been identified on the western edge of the Neoproterozoic Santa Quiteria magmatic arc. These are hosted by metadiorites, a bimodal metavolcanic sequence and metasedimentary rocks crosscut by post-collisional biotite granite intrusions. Five Fe- P (+/- Cu) occurrences are recognized: (1) banded or stratabound magnetite-apatite-monazite; (2) massive magnetite-(specular hematite)-apatite; (3) disseminated and vein-type magnetite-apatite in metadiorite; (4) massive hematite bodies; and (5) skarn-type with magnetite, garnet, clinopyroxene and amphibole. These occurrences also contain mineral assemblages formed by sodic- calcic, potassic and propylitic alteration. Mineral chemistry data show that: (i) except for vein types, apatite in all the mineralization styles is F rich (2.4 <= F <= 4.4%), low in CI (<0,5%); and (ii) magnetite contains different concentrations of Ti, V, Cr and Ni attributed to both igneous and hydrothermal environments. However, the low sulphide content and high concentration of apatite indicate that the investigated Fe-P (+/- Cu) occurrences are of the IOA type. 

Mercier-Langevin, P; Dube, B; Bardoux, M; Ross, PS; Dion, C 

9782981689801 

14th SGA Biennial Meeting on Mineral Resources to Discover 

Québec City, QC 

August 20-23, 2017