Banca de QUALIFICAÇÃO: Yuri Tatiana Campo Rodríguez

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : Yuri Tatiana Campo Rodríguez
DATE: 27/10/2022
TIME: 14:00
LOCAL: Sala de videoconferência do IGD
TITLE:

IOCG and IOA deposits form the Carajás Mineral Province: Approach from ore-forming processes/ore deposits linking textures with chemical/isotopic compositions.

KEY WORDS:

IOCG, Magnetite, Mineralogy, Geochemistry, Carajás.

PAGES: 60
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The Iron oxide copper-gold IOCG deposits are featured by large volumes of magnetite as the main Fe-oxide, which through textures and chemistry records the origins of ore-forming fluids and multiple overprints. Combined, petrography and geochemical evidence found in magnetite from Jatobá and Jaguar deposits located in the Carajás Mineral Province, show a formation at the early hydrothermal alkali-calcic alteration with features comparable with silician magnetite. The magnetite grains from both deposits forms in the presence of calcic-magnesium silicates with geochemical modelling at >450° C and are typified by Ti-rich trellis lamellae of ilmenite and sub-micrometer inclusions. Besides, these magnetite grains are accompanied by Ni-rich sulphide mineralogy and preserve the same geochemical signature from the early hydrothermal formation to the later low-temperature vein stage, suggesting that the ore in each deposit could be attributable to the evolution of a Ni-bearing fluid that holds the Ca-Fe features of an IOCG system.

BANKING MEMBERS:
Interno - 404825 - CESAR FONSECA FERREIRA FILHO
Interno - 418965 - CLAUDINEI GOUVEIA DE OLIVEIRA
Presidente - 2697315 - MARIA EMILIA SCHUTESKY
Interno - 6404885 - NILSON FRANCISQUINI BOTELHO
Interno - 1057547 - VALMIR DA SILVA SOUZA