Síntese geológica e geocronológica do Cráton São Luís e do Cinturão Gurupi na região do Rio Gurupi (NE-Pará / NW-Maranhão)

Authors

  • Evandro Luiz Klein Companhia de Pesquisa de Recursos Minerais; Serviço Geológico do Brasil
  • Candido Augusto Veloso Moura Universidade Federal do Pará; Laboratório de Geologia; Centro de Geociências

DOI:

https://doi.org/10.5327/S1519-874X2003000100008

Keywords:

geochronology, lithostratigraphy, Paleoproterozoic, Gurupi Belt, São Luís Craton

Abstract

The Gurupi region in northern Brazil has been divided into Paleoproterozoic (São Luís Craton) and Neoproterozoic (Gurupi Belt) geochronological domains based on Rb-Sr and K-Ar. Recent zircon (Pb evaporation) dating of most of the lithostratigraphic and lithodemic units, in addition to limited whole-rock Sm-Nd determinations, shows virtually all rock units (juvenile or reworked) formed between ~2.0 Ga and 2.2 Ga. A single granitoid shows a Neoproterozoic crystallization age (~0,55 Ga), and the Archean has been recorded only in inherited zircons and in protolith Sm-Nd model ages. The compositional, metamorphic, structural, geophysical and geochronological characteristics of the geological units supports the previous subdivision into two domains. However, they also reveal a common Paleoproterozoic evolution of both the Gurupi and São Luís domains. The Gurupi domain is characterized as a collisional orogen, whereas the São Luís domain shows accretionary characteristics, with both participating in the widespread Paleoproterozoic collage at 2.2 - 2.0 Ga. During the Neoproterozoic, the southern border of this region was affected by strong strike-slip shearing and very limited lithogenesis, reflecting the Brasiliano orogenic collage elsewhere and defining the presently observed relationship between the São Luís Craton and the Gurupi Belt.

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Published

2003-08-01

Issue

Vol. 3 (2003)

Section

Articles

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How to Cite

Klein, E. L., & Moura, C. A. V. (2003). Síntese geológica e geocronológica do Cráton São Luís e do Cinturão Gurupi na região do Rio Gurupi (NE-Pará / NW-Maranhão) . Geologia USP. Série Científica, 3, 97-112. https://doi.org/10.5327/S1519-874X2003000100008