DSpace Coleção:
http://www.repositorio.ufop.br/jspui/handle/123456789/9
2024-01-18T08:47:48ZModelagem espacial dos locais de ocorrência de paleotocas nas Serras do Gandarela e do Curral, Quadrilátero Ferrífero - MG.
http://www.repositorio.ufop.br/jspui/handle/123456789/17496
Título: Modelagem espacial dos locais de ocorrência de paleotocas nas Serras do Gandarela e do Curral, Quadrilátero Ferrífero - MG.
Autor(es): Assis, Driele Antunes de; Castro, Paulo de Tarso Amorim
Resumo: O geossistema ferruginosos do Quadrilátero Ferrífero (QFe) constantemente envolve cenários de disputa entre exploração
mineral e conservação ambiental. Estudos recentes em cavernas da região, atestaram que duas delas tratam-se de paleotocas. Em
litologia ferruginosa, foram verificados inicialmente no Vale do Rio Peixe Bravo (VPB), norte de Minas Gerais. No QFe, os únicos
registros encontrados estão situados na Serra do Gandarela e na Serra do Curral, escavados no contato canga/saprolito. Especialmente
a paleotoca do Gandarela, está ameaçada pela mineração. O objetivo deste trabalho foi discriminar áreas-alvo potenciais de novas
ocorrências de paleotocas no QFe a partir da comparação das características geomorfológicas e geológicas das áreas de ocorrência
destes icnofósseis tanto no QFe, quanto em outros geossistemas ferruginosos. Os procedimentos metodológicos envolveram a técnica
Delphi e o uso de geoprocessamento na construção de mapas temáticos e elaboração de um mapa de potencialidade de ocorrências. A
análise permitiu identificar que as duas paleotocas e a maioria das cavidades naturais registradas em zonas de alto potencial, ocorrem
em rochas do Grupo Itabira (itabiritos). Por serem áreas de grande interesse da mineração, tornam-se prioritárias à investigação e
caracterização, de modo a garantir a integridade de possíveis registros paleontológicos.2022-01-01T00:00:00ZMetabarcoding of soil fungal communities in rupestrian grassland areas preserved and degraded by mining : implications for restoration.
http://www.repositorio.ufop.br/jspui/handle/123456789/17334
Título: Metabarcoding of soil fungal communities in rupestrian grassland areas preserved and degraded by mining : implications for restoration.
Autor(es): Figueiredo, Maurílio Assis; Silva, Thamar Holanda da; Pinto, Otavio Henrique Bezerra; Leite, Mariangela Garcia Praça; Oliveira, Fábio Soares de; Messias, Maria Cristina Teixeira Braga; Rosa, Luiz Henrique; Câmara, Eduardo Aguiar Saraiva; Lopes, Fabyano Alvares Cardoso; Kozovits, Alessandra Rodrigues
Resumo: Rupestrian grasslands are vegetation complexes of the Cerrado biome (Brazilian savanna), exhibiting simultaneously great biodiversity and important open-pit mining areas. There is a strong demand for the conservation of remaining areas and restoration of degraded. This study evaluated, using next-generation sequencing, the diversity and ecological aspects of soil fungal communities in ferruginous rupestrian grassland areas preserved and degraded by bauxite mining in Brazil. In the preserved and degraded area, respectively, 565 and 478 amplicon sequence variants (ASVs) were detected. Basidiomycota and Ascomycota comprised nearly 72% of the DNA, but Ascomycota showed greater abundance than Basidiomycota in the degraded area (64% and 10%, respectively). In the preserved area, taxa of different hierarchical levels (Agaromycetes, Agaricales, Mortierelaceae, and Mortierella) associated with symbiosis and decomposition were predominant. However, taxa that colonize environments under extreme conditions and pathogens (Dothideomycetes, Pleoporales, Pleosporaceae, and Curvularia) prevailed in the degraded area. The degradation reduced the diversity, and modified the composition of taxa and predominant ecological functions in the community. The lack of fungi that facilitate plant establishment and development in the degraded area suggests the importance of seeking the restoration of this community to ensure the success of the ecological restoration of the environment. The topsoil of preserved area can be a source of inocula of several groups of fungi important for the restoration process but which occur in low abundance or are absent in the degraded area.2023-01-01T00:00:00ZSpatial distribution of chemical elements in the surface sediments of a tropical estuary in north-eastern Brazil.
http://www.repositorio.ufop.br/jspui/handle/123456789/17333
Título: Spatial distribution of chemical elements in the surface sediments of a tropical estuary in north-eastern Brazil.
Autor(es): Pereira, Monise da Silva; Santana, Carolina Oliveira de; Gonzalez Pacheco, Mauricio; Jesus, Taíse Bomfim de; Francos, Marcos; Castro, Paulo de Tarso Amorim; Nolasco, Marjorie Csekö; Corvacho Ganahin, Oscar; Carneiro, Luanna Maia; Dourado, Gilson Barbosa; Hadlich, Gisele Mara; Bogunovic, Igor
Resumo: The high socioeconomic importance of estuarine environments is contributing to their continuous and increasing
settlement by human populations and a growing negative impact on those sensitive habitats. Considering the
natural importance of estuarine regions, this study aimed to quantify and spatialize the distribution of the
chemical elements iron (Fe), aluminium (Al), manganese (Mn), vanadium (V), barium (Ba), zinc (Zn), copper
(Cu), lithium (Li), cobalt (Co), chromium (Cr), nickel (Ni), lead (Pb) and arsenic (As) and produce a potential risk
assessment from the surface sediments along the extent of the Serinha ́em Estuary, Bahia, Brazil, in order to
evaluate the environmental quality of the estuary. The mean concentrations of the chemical elements followed
the order: Fe > Al > Mn > Ba > Zn > V > Cr > As > Pb > Co > Li > Cu > Ni. Through analysis using the geo-
accumulation index, the concentrations of the chemical elements were determined to reflect the local lithology
and not the influence of human activities for all the elements, with the exception of Ba, the enrichment of which
came from Camamu Bay. The chemical elements in the sediments do not pose a risk to the local biota or the
human population. The distribution maps revealed a tendency for the accumulation of higher concentrations of
elements in some sectors of the channel. This study can be used in the future as a complete profile of the
background concentrations of the studied elements in the sediments, aiding in the continuity of monitoring
actions.2022-01-01T00:00:00ZFerruginous duricrusts associated with diamond occurrences in the Diamantina Plateau, south Espinhaço Range, Brazil.
http://www.repositorio.ufop.br/jspui/handle/123456789/17332
Título: Ferruginous duricrusts associated with diamond occurrences in the Diamantina Plateau, south Espinhaço Range, Brazil.
Autor(es): Milagres, Alcione Rodrigues; Oliveira, Fábio Soares de; Varajão, Angélica Fortes Drummond Chicarino; Varajão, César Augusto Chicarino
Resumo: Macromorphological and micromorphological characterization of the alteration facies associated with geomorphological studies are of great importance for understanding the genesis and evolution of ferruginous duricrusts. The study of the ferruginous duricrusts in the Diamantina Plateau (Southern Espinhaço Range, Minas Gerais), a region known worldwide for hosting important diamond deposits, was based on the characterization of the faciological variations of representative alteration profiles. The morphometric indexes of the area, macromorphological description of the profiles, and sampling for micromorphological and mineralogical analyzes were carried out to assist in the understanding of the landforms. The results show that the ferruginous duricrusts occur preferentially in the plateaus and high slopes, with the Sopa-Brumadinho Formation as substrate. Two types of ferruginous duricrust have been identified. Type 1 is characterized as a platy duricrust developed from a saprolite of hematitic phyllite with a ferruginous banded structure. Type 2 is characterized by a massive duricrust typically lateritic that overlaps a nodular and mottled facies, originated from a saprolite of hematitic phyllite with a diffuse distribution of opaque minerals. This phyllite is one of the rocks that occur with the diamond host rocks in the old mines of the region. Both types of ferruginous duricrusts formed by relative accumulation evolve into fragmentary facies and the soil. Locally, in discordant contact, occurs a concretionary duricrust, characterized by an absolute iron accumulation mechanism.2021-01-01T00:00:00Z