• Rua Carlos Gomes, 250 - CEP: 13083-855 - Campinas, SP, Brasil

Image not available

  • Portuguese, Brazil
    Image not available
  • English
    Image not available
  • Spanish
    Image not available
Utilizar o username do domínio IGE
Utilizar a senha do domínio IGE
  • Reinicializar su contraseña
IG 45 anos
Image not available
Unicamp
Image not available

Main Menu

  • Institucional
    • Presentación
    • Departamentos
      • DGEO
      • DGRN
      • DPCT
    • Biblioteca
      • Comisión
      • Reglamento
      • Equipo
      • Servicios
      • Links
      • Redes Sociales
    • Contacto
  • Comunidad
    • Facultad
    • Colaboradores
    • Personal
    • Investigadores
    • Posdoctorados
  • Grado
    • Presentación
    • Grado en Geología
    • Grado en Geografía
    • Becas y prácticas
    • Contacto
  • Postgrado
    • Presentación
    • Programas
      • Enseñanza e Historia de las Ciencias de la Tierra
      • Geociencias
      • Geografía
      • Política Científica y Tecnológica
    • Reglamentos y Catálogos
    • Entidades estudiantiles
    • PED - Programa de Prácticas Docentes
    • Becas
    • Asignaturas ofrecidas
    • Estudiante Especial
    • Defensas y Calificaciones
      • Agenda
      • Procedimientos para la defensa de disertaciones y exámenes de calificación
    • Depósito de Tesis y Disertaciones
    • Contacto
  • Investigación
    • Recursos de investigación
    • Oficina de Apoyo a Proyectos
    • Producción académica y científica
    • Contacto
  • Laboratórios
  • Cultura y Extensión
    • Presentación
    • Cursos de Extensión y Especialización
    • Actividades de extensión
    • Contacto
  • Comunicación
    • Notícias
    • Redes sociales

Zircon U–Pb geochronology of manganese-rich rocks from the Borborema Province, Northeast Brazil: adding a new piece to the global inventory of Paleoproterozoic manganese mineralization

Ruta de navegación

  • Inicio
  • Zircon U–Pb geochronology of manganese-rich rocks from the Borborema Province, Northeast Brazil: adding a new piece to the global inventory of Paleoproterozoic manganese mineralization
Wagner Amaral
Image not available
Felipe Holanda dos Santos
Wagner da Silva Amaral
Douglas Teixeira Martins
Ana Clara Braga de Souza
DGRN

The Borborema Province hosts several Mn-rich metasedimentary sequences, containing up to 40 wt% MnO(total). These sequences are composed of Mn oxide and Mn silicate lenses that alternate with spessartite quartzite layers. They are also spatially associated with graphite-bearing gneissic and granitic rocks. Here, we use the Lagoa do Riacho manganese deposit, a Mn-rich sequence of the northern Borborema Province (within the Canindé do Ceará Complex), to constrain the time of deposition of the Mn-rich sedimentary protolith, discuss its tectonic setting, and draw correlations between African and Brazilian manganese deposits. The age of the youngest detrital zircon population from a meter-sized spessartite quartzite bed, interlayered with oxidized Mn ore, was close to 2130 Ma. Similarly, a gneiss hosting the Mn mineralization yielded a maximum depositional age close to 2156 Ma. U–Pb dating of zircon metamorphic overgrowths from the Mn-bearing sequences and host rocks coupled to a zircon U–Pb crystallization age of an intrusive leucocratic granite provided a minimum age interval for the Mn-rich succession (ca. 2106–2023 Ma). These constraints point to a Rhyacian depositional age (ca. 2200–2100 Ma) for the Mn-rich precursors, which were most likely deposited as syn-orogenic sediments. The results also allow us to conclude that the age range of 2200–2100 Ma is coeval with the timing of deposition of other world-class manganese deposits, such as those from the Francevillian and Birimian groups in Gabon and Ghana, respectively, besides those from the South American Platform (e.g., Serra do Navio, Carajás, and Minas Gerais).

Keywords: Borborema province; Manganese; U–Pb dating; Detrital zircon; Paleoproterozoic; Rhyacian

Wagner da Silva Amaral

Mineralium Deposita

Dirección

Rua Carlos Gomes, 250
CEP: 13083-855
Campinas, SP

¿Cómo llegar? 

22º48'48"S 47º04'09"W

Footer menu

  • Feedback do Portal

Links

  • Email Unicamp
  • Sistemas e Solicitações
  • Intranet (antiga)
  • Logotipos do IG
  • Fale com o IG

Menu do usuário

  • Iniciar sesión
IG 45 anos
Unicamp

Copyright © 2025 IG, Unicamp. Todos os direitos reservados

Notifications