Lithological control on the formation of ferruginous duricrusts in the Espinhaço Range (Minas Gerais, Brazil).

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Autor(es): dc.creatorMilagres, Alcione Rodrigues-
Autor(es): dc.creatorOliveira, Fábio Soares de-
Autor(es): dc.creatorVarajão, Angélica Fortes Drumond Chicarino-
Autor(es): dc.creatorVarajão, César Augusto Chicarino-
Autor(es): dc.creatorMedeiros Júnior, Edgar Batista de-
Autor(es): dc.creatorRamanaidou, Erick Raymond-
Data de aceite: dc.date.accessioned2025-08-21T15:58:08Z-
Data de disponibilização: dc.date.available2025-08-21T15:58:08Z-
Data de envio: dc.date.issued2024-09-13-
Data de envio: dc.date.issued2024-09-13-
Data de envio: dc.date.issued2022-
Fonte completa do material: dc.identifierhttps://www.repositorio.ufop.br/handle/123456789/18658-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0341816223004654-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.catena.2023.107374-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1028837-
Descrição: dc.descriptionThe Espinhaço Range is the scene of a long history of exposure to chemical weathering and erosion processes since the Cretaceous. As a result, ferruginous duricrusts can be considered as the fingerprint of the long-term surface process and may provide us critical clues about changes in paleo-environmental features during the Cenozoic. In addition, specifically for the Diamantina plateau, located in the state of Minas Gerais (Brazil), there is great interest in studying the duricrusts of the Espinhaço Range, because they are associated with diamond mining, explored since the eighteenth century and which gave its name to the region. Even so, few studies have contributed to understanding their formation and morphological diversity. Mineralogical, geochemical, and micromorphological studies were undertaken to understand the processes involved in the formation of the two representative types of ferruginous duricrust, linked to phyllites of Espinhaço Supergroup: platy and massive types. The platy duricrust develops from the weathering of a banded ilmenite-hematite phyllite where the alteromorphization of its compositional banding and original foliation leads to the formation of an isalteritic duricrust. The massive duricrust, associated with diamond mining, is genetically linked to a quartz-phengite phyllite. Both duricrust profiles show relative enrichment in Fe and P and depletion of the other major elements compared to the saprolite, however, the iron concentration was 10 times greater in the massive than the platy duricrust. The REEs show similar distribution patterns with preferential leaching in both duricrusts. The compositional and textural variation of the phyllite in the Diamantina Plateau leads to the distinct evolution of two representative duricrusts profiles. The mineralogical, micromorphological, and geochemical analyses reinforce the lithological control in the formation of these two different types of ferruginous duricrusts in the study area, located in similar topographic and climatic conditions.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectLateritic duricrust-
Palavras-chave: dc.subjectIsalteritic duricrust-
Palavras-chave: dc.subjectPhyllite-
Palavras-chave: dc.subjectEspinhaço Supergroup-
Palavras-chave: dc.subjectDiamantina Plateau-
Título: dc.titleLithological control on the formation of ferruginous duricrusts in the Espinhaço Range (Minas Gerais, Brazil).-
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