Lithological controls of phosphatization in oceanic islands, Equatorial Atlantic, Brazil.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorDuarte, Eduardo Baudson-
Autor(es): dc.creatorVarajão, Angélica Fortes Drummond Chicarino-
Autor(es): dc.creatorOliveira, Fábio Soares de-
Autor(es): dc.creatorRenac, Christophe-
Autor(es): dc.creatorSchaefer, Carlos Ernesto Gonçalves Reynaud-
Autor(es): dc.creatorCorrêa, Guilherme Resende-
Data de aceite: dc.date.accessioned2025-08-21T15:27:08Z-
Data de disponibilização: dc.date.available2025-08-21T15:27:08Z-
Data de envio: dc.date.issued2024-09-13-
Data de envio: dc.date.issued2024-09-13-
Data de envio: dc.date.issued2023-
Fonte completa do material: dc.identifierhttps://www.repositorio.ufop.br/handle/123456789/18659-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0341816224003357-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.catena.2024.108138-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1015237-
Descrição: dc.descriptionThe São Pedro and São Paulo archipelago (SPSPA) is noteworthy for its unusual lithology when compared to other oceanic archipelagos, consisting of mylonitized and serpentinized peridotites, and rare carbonate sedimentary rocks. There, marine bird species use these substrates as a nesting ground and excrement deposition (i.e. guano), resulting in widespread phosphatization of local substrates. The unique geological nature of the SPSPA makes it particularly fascinating for geochemical and mineralogical research since diverse lithological, microstructural and microchemical attributes are present. This study aims to investigate the microscale chemical and mineral composition of the phosphatization materials in SPSPA, in relation to different geological substrates and associated mineralogy. Speleothems of secondary phosphates formed in fractures and on the walls, as a result of guano percolation. The microstructural control is the primary factor, which depends on the degree of rock fracturing. Wider and interconnected fractures allow the gravitational flow of cations and phosphate rich solutions with resulting phosphatization. Secondary factor is the substrate/guano interaction, which contributes to the precipitation of secondary phosphate minerals. The microchemical control is influenced by the degree of serpentinization, which leads to the generation of iron phosphates with structural potassium and aluminum. Phosphatization of sedimentary rocks is associated with pre-existing fractures and cavities, as well as the carbonate composition of the rock. This study enhances our understanding of varying ornithogenesis in the SPSPA, with a specific emphasis on the process of phosphatization of oceanic islands. Understanding this process can assist in understand the genesis of phosphate deposits in comparable environments, enhancing the knowledge of the biogeochemical cycle of phosphorus on Earth.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectPeridotite-
Palavras-chave: dc.subjectGuano-
Palavras-chave: dc.subjectOrnithogenesis-
Palavras-chave: dc.subjectPhosphate-
Palavras-chave: dc.subjectSão Pedro and São Paulo archipelago-
Título: dc.titleLithological controls of phosphatization in oceanic islands, Equatorial Atlantic, Brazil.-
Aparece nas coleções:Repositório Institucional - UFOP

Não existem arquivos associados a este item.