Banca de QUALIFICAÇÃO: ADRIANO HENRIQUE ANDRADE DE AGUIAR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ADRIANO HENRIQUE ANDRADE DE AGUIAR
DATE: 31/01/2025
TIME: 14:30
LOCAL: Videoconferencia
TITLE:

Chemical and mineralogical characterization of aluminum phosphates from the Samambaia Fault, Rio Grande do Norte

 

KEY WORDS:

Aluminum phosphates; Variscite; Crandallite; Samambaia Fault

PAGES: 50
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The Samambaia Fault, one of the most significant seismogenic structures in Northeast Brazil, hosts aluminum phosphate mineralizations within fractures and quartz veins associated with hydrothermal events. This study provides a textural and chemical characterization of these mineralizations, focusing on variscite, crandallite, millisite/wardite, and kaolinite, using techniques such as XRD, QEMScan, SEM/EDS, and EPMA. Variscite is the dominant phosphate, showing a compositional transition between variscite and Fe-variscite. Calcium-rich phosphates indicate interactions with Ca- and Fe-rich fluids, while clay minerals suggest intense supergene processes. The proposed paragenetic sequence reveals that the geochemical evolution of the system was controlled by meteoric fluid percolation and fluid-rock interaction. These findings contribute to understanding mineralization processes in tectonically active zones and their implications for silicified and fractured reservoir systems.

COMMITTEE MEMBERS:
Externa ao Programa - ***.911.124-** - CRISTIANE PAULINO DE MENEZES - UFRN
Presidente - 2042352 - FREDERICO CASTRO JOBIM VILALVA
Externa à Instituição - Paola Ferreira Barbosa