New lithostratigraphic unit records an ediacaran glaciation in Mato Grosso state, Brazil: Serra Azul formation

Authors

  • Milene Freitas Figueiredo Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Marly Babinski Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Carlos José de Souza Alvarenga Universidade de Brasília; Instituto de Geociências
  • Francisco Egídio Cavalcante Pinho Universidade Federal de Mato Grosso; Instituto de Ciências Exatas e da Terra; Departamento de Recursos Minerais

DOI:

https://doi.org/10.5327/Z1519-874X2008000200005

Keywords:

Serra Azul Formation, Paraguay Belt, glaciation, Neoproterozoic, Ediacaran

Abstract

A new succession of diamictites and siltstones was found above post-Marinoan carbonates from the Araras Group in the northern Paraguay Belt (Brazil), in discontinuous outcrops. This new stratigraphic unit, named Serra Azul Formation in this work, has a variable thickness reaching up to 300 meters. The diamictites were deposited in the first 70 m and present glacial evidences, while the siltstones represent the upper part of the succession and show some sandstone layers towards the top of the succession. This glacial record is the youngest Neoproterozoic glacial event that has been found on South America and probably is related to Gaskiers Glaciation (582 Ma).

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Published

2008-10-01

Issue

Vol. 8 No. 2 (2008)

Section

Articles

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How to Cite

Figueiredo, M. F., Babinski, M., Alvarenga, C. J. de S., & Pinho, F. E. C. (2008). New lithostratigraphic unit records an ediacaran glaciation in Mato Grosso state, Brazil: Serra Azul formation . Geologia USP. Série Científica, 8(2), 65-75. https://doi.org/10.5327/Z1519-874X2008000200005