FCT - Faculdade de Ciências e Tecnologia

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Mapeamento geológico 1:20.000 da Região Norte do depósito de cobre do município de Bom Jardim de Goiás - GO
(Universidade Federal de Goiás, 2024-11-29) Oliveira, Bruna Edriane Ramos de; Temporim, Filipe Altoé; Arab, Paola Bruno; Arab, Paola Bruno; Cavalcanti, Débora Ezequiel; Silva, Felipe de Lima da
The Bom Jardim de Goiás (BJG) region is part of the geological context of the Arenópolis Magmatic Arc, located in the far west of Goiás. It became the object of research in the 1970s, after the Geological Survey of Brazil (CPRM) identified radiometric anomalies on the edge of the Serra Negra Granite, which led to the development of extensive research projects. Despite this, the geological complexity of the region and the typology of the deposit are still not fully understood. The Bom Jardim de Goiás Metavolcanosedimentary Sequence features a diversity of volcanic rocks, ranging from metabasalts and metandesites to rhyolites, while the sedimentary portion includes metaconglomerates, phyllites and quartzites. The intermediate tuffs contain a small deposit of copper sulphides, initially associated with volcano-exhalative processes. The general objective of the work was to carry out detailed geological mapping of the northern region of the Bom Jardim de Goiás copper deposit, with the aim of improving understanding of the deposit model by integrating data from aerial images, geophysics, field studies and laboratory analyses. Specifically, the aim was to draw up a 1:20,000 scale geological map with geological profiles, correlate maps of magnetometric and gammaspectrometric domains and homologous zones, carry out detailed petrographic descriptions and reinterpret the structural geology of the area. The study covered an area of 24 km², with semidetailed geological mapping integrated with the interpretation of aerogeophysical data, photointerpreted satellite images and petrographic descriptions. Based on this data, a reinterpretation of the structural geology was proposed and, based on historical information, comparisons were made with the geological model of the deposit. In the pre-field phase, a bibliographic survey and compilation of historical data were carried out. During the field phase, geological mapping was carried out, hand samples were taken and structural data was obtained. In the post-field phase, the geological map and data were prepared in a GIS environment, petrographic description, structural interpretation with stereograms and rosette diagrams, and the information was consolidated in a report. The work involved geological-structural mapping of an area made up of basic and metavolcanosedimentary rocks from the Paleoproterozoic, with the aim of detailing their lithological and structural characteristics. During the study, it was possible to individualize the Metabasalt Lithofacies in the Córrego da Furna Formation, based on magnetometric responses, in addition to identifying new, previously unknown occurrences of sulphides. This data made it possible to propose a different deposit model from the existing ones, contributing to understanding the geological evolution of the area. The analysis also indicated the possible continuity, to the north, of the copper deposit previously identified by CPRM, broadening the region's exploration prospects. In structural geology, four structural domains were defined and at least three phases of deformation recorded in the lithologies were recognized. Domain 1, associated with the Cuiabá Group rocks, has a N-S structural trend and isoclinal folds related to the D1 deformation. Domain 2 covers the Morro do Urubu, Aldeinho and Morro Selado Formations of the BJG Sequence, with a N-S trend and dips to the E and W. Domain 3, associated with the Córrego da Furna and Córrego da Aldeia Formations, where the copper deposit to the south is located, showed the main S1 foliation subdivided into two pole patterns: one in the NE-SE quadrants and the other in the NW-SW quadrants. This garland pattern suggests a second phase of deformation and was the only one to differ from the bibliography. Finally, Domain 4, related to the Serra Negra Granite Unit, showed structures oriented predominantly to the east. These results highlight the tectonic complexity of the area and provide new information on its structural evolution.
Mapeamento geológico integrado 1:50.000 da região da Serra da Jiboia (GO) - área 1
(Universidade Federal de Goiás, 2023-02-15) Coutinho, Nathália Amaral; Maciel, Victor Augusto Silva; Nascimento, Estela Leal Chagas do; Lopes, Débora Nogueira; Lopes, Débora Nogueira; Santos, Marcelo Henrique Leão; Siepierski, Lincoln
This paper presents the results obtained from the 1:50000 mapping of the Serra da Jiboia region. The detailing of the geological units was possible with the conciliation of bibliographical survey, photointerpretation, geophysical, geochemical, and geoenvironmental, lithological and structural data obtained in the field. As a result, the following mapped units were detailed in the context of the Brasília Belt brim and the Goiás Magmatic Arc (AMG): Anicuns-Itaberaí Metavolcanosedimentary Sequence (SAI), Campestre Gnaissic-Migmatitic Complex, Santa Bárbara Complex and the Creoulos Granodiorite. The SAI is characterized in forearc basin associated with an island arc system, recorded by platform sedimentation in the rhythmic-carbonate unit and marine regression depositional in the psamo-pelitic unit. The Creoulos granodiorite records syncolonal magmatism of meta to peraluminous granites. The geological evolution is marked in the Brasiliano, responsible for the opening of the Goiás Ocean and later the closure. This phase concludes the formation of island arcs and the Brasília orogen. The deformation of the rocks is represented by east-west compression that resulted in isoclinal thrust folds with N-S axis and eastward vergence with higher temperature and pressures. Conjugate fracture systems occur, with E-W and NE-SW direction that, by progressive deformation, originate NS, NW and NE transcurrent shear zones. The observed metamorphism of the rocks is a variation of high greenish schist to amphibolite facies, associated to SAI, besides hydrothermal metamorphism linked to shear zones. The area presents some economic aspects, with potential for manganese, calcitic marble and remineralizers for agriculture and gravel and sand for civil construction.
Mapeamento geológico integrado 1:50.000 da região da Serra da Jiboia (GO) - área 3
(Universidade Federal de Goiás, 2023-02-14) Silva, Gabriela Soares Freitas e; Silva, Michele Urbano da; Reis, Mateus Andrade; Reis, Mateus Andrade; Heringer, Rodrigo de Almeida; Lima, Martha Noélia
The area of study is located in the southeast portion of the state of Goiás, next to the municipalities of Nazário and Anicuns. It is geologically located in the context of the Goiás Magmatic Arc (AMG), which is composed by rocks that register the complex metamorphic and structural geotectonic development, associated with the Brasiliano orogenesis (Arquean-Neoproterozoic), developed mainly during the structuring of the Brasília Belt. The integrated geological mapping aimed to map the different lithofacies associated with the outcropping units, namely: Anicuns Itaberaí Metavolcanosedimentary Sequence, Anápolis Itauçu Granulitic Complex, Campestre Gneiss Migmatitic Complex, Anicuns-Santa Bárbara Suite, Creole Granite and undifferentiated granitic intrusions. The work was carried out from the processing and interpretation of photointerpretive, geophysical, geochemical and geoenvironmental data, as well as lithological and structural data collected in the fieldwork, generating geological, structural and point maps as final products. The rocks exhibit metamorphism from greenschist facies to the amphibolite-granulite transition. Four deformational phases were identified: D1 generated a main E-W compression, marked by isoclinal folds with NS axes, which folded S0 and originated the S1 foliation; D2 represents the continuity of compression, generating parasitic folds and S2 foliation; D3 represents the formation of NW-SE shear zones and thrust faults, associated with the continuity of E-W compression; D4 reflects the decrease in compression, generating S3 foliation. The area presents occurrences of minerals used in civil engineering and industry.
Mapeamento geológico integrado 1:50.000 da região da Serra da Jiboia (GO) - área 4
(Universidade Federal de Goiás, 2023-02-15) Santos, Daniel Carelli Batista; Carvalho, Franklin Williams Silva de; Lima, Gabriel Dutra de; Temporim, Filipe Altoé; Temporim, Filipe Altoé; Oliveira, Ítalo Lopes de; Arab, Paola Bruno
The present work had as objective the geological mapping in the region of Nazário - GO from the accomplishment of systematic works that integrated data from remote sensing (orbital images), geophysical, geochemical, lithological, petrographic, structural and geoenvironmental surveys. The result of the integrated work was the geological cartography of Neoproterozoic units associated to the Goiás Magmatic Arc: Metavolcanosedimentary Anicuns-Itaberaí Sequence, Anápolis-Itauçu Complex, Creoulos Granite and Santa Bárbara Anorthositic Complex. Four deformational stages were recognized in the area: D1 represents E-W compression associated with regional folds with eastward vergence; D2 is the E-W compression refolding of the D1 progression; D3 characterizes shallower crustal level change during deformation progression and generates N-S lateral shortening of the D2 deformation and N-S axis crenulations; D4 represents the ruptile-ductile stage of E-W compression with formation of shear zones and thrust faults. In general, the rocks of the Anicuns-Itaberaí Metavolcanosedimentary Sequence in the study area are metamorphosed between green schist and amphibolite facies with retrometamorphism to green schist facies. The region is relevant for understanding the evolution of the Brasília Belt, as the rocks are linked to tectonic and magmatic events that started with in the formation of the Magmatic Arco f Goias. The study area is economically interesting due to the presence of mineral occurrences with potential for metallurgy (manganese and iron) and civil construction (sand, gravel, crushed stone and ornamental rocks).
Relatório final do mapeamento geológico 1:50.000 da região de Anicuns (GO) - área 4
(Universidade Federal de Goiás, 2021-11-25) Messias, Davi Resende; Ramos, Lucas Portes; Sanchez, Joana Paula; Melo, Rodrigo Prudente de; Melo, Rodrigo Prudente de; Brod, José Affonso; Farias, Vanderlei de
This work was accomplished through the processing and the interpreting of images, geophysical, geochemical, and environmental data and lithological and structural data obtained in the field. The geological mapping in the Anicuns region had as result the outlining of units in the Goiás Magmatic Arc (AMG) context, including gneisses from the Sanclerlândia Metagranite and rocks from the Anicuns-Itaberaí Metavolcanosedimentary Sequence, units associated to sincollisional magmatism (Córrego da Lavrinha and Creoulos granites) and mafic rocks associated to volcanism installed through the collisional orogen collapse (Córrego Seco Complex), all comprising the Brasília Belt. Four deformational phases were recognised in the area: D1 represents an EW compression that generates folds verging East, which is refolded by D2, an EW compression from D1 progression; D3 is a NS lateral shortening that creates crenulation with an EW axis; D4 represents the ruptile last stage of the EW compression, with shear zones and thrust faults associated. The area is important in the understanding of the Brasília Belt evolution because its rocks are inserted in the tectonic and magmatic events related to the belt development, starting with the AMG formation in the Tonian Period, during the fracturing of the Rodinia Paleocontinent, and progresses until the Goiás Paleocean closure, when the last magmatic events occur. Economically, the area is interesting because of the presence of potential to numerous metallogenetic processes, including contact metamorphism, volcanism and hydrothermalism. The main mineral occurrences are gold and gravel.

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