Magmatismo há ca. 660 - 640 Ma no Domínio Socorro: registros de convergência pré-colisional na aglutinação do Gondwana Ocidental

Authors

  • Peter Christian Hackspacher Universidade Estadual Paulista; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia
  • Allen Hutcheson Fetter Universidade Estadual Paulista; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia
  • Hans Dirk Ebert Universidade Estadual Paulista; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia
  • Valdecir de Assis Janasi Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Elton Luiz Dantas Universidade de Brasília; Instituto de Geociências; Departamento de Geologia Geral e Aplicada
  • Marcos Aurélio Farias de Oliveira Universidade Estadual Paulista; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia
  • Iramaia Furtado Braga Universidade Estadual Paulista; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia
  • Francisco de Assis Negri Instituto Geológico

DOI:

https://doi.org/10.5327/S1519-874X2003000100007

Keywords:

precollisional convergence, Neoproterozoic, Mantiqueira Province

Abstract

Uranium-lead zircon ages between 660 and 640 Ma, obtained from a series of calc-alkaline orthogneisses and plutons in southeast Brazil's Central Mantiqueira Province, suggest that a significant period of magmatism occurred in this region prior to the collisional assembly of West Gondwana (presently constrained in the region between ca. 625 and 580 Ma). While the nature of this earlier magmatism is presently unclear, some preliminary Sm-Nd data suggest that these magmas were not solely derived from the Paleoproterozoic lithosphere, but appear to represent hybrid products of Paleoproterozoic and Neoproterozoic sources. As such hybrid mixtures have been most commonly observed in continental arc settings, it is possible that the 660 to 640 Ma magmatism represents arc magmatism that resulted from subduction of Neoproterozoic oceanic crust during early precollisional convergence and closure of a branch of either the Adamastor or Goianides oceans.

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Published

2003-08-01

Issue

Vol. 3 (2003)

Section

Articles

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How to Cite

Hackspacher, P. C., Fetter, A. H., Ebert, H. D., Janasi, V. de A., Dantas, E. L., Oliveira, M. A. F. de, Braga, I. F., & Negri, F. de A. (2003). Magmatismo há ca. 660 - 640 Ma no Domínio Socorro: registros de convergência pré-colisional na aglutinação do Gondwana Ocidental . Geologia USP. Série Científica, 3, 85-96. https://doi.org/10.5327/S1519-874X2003000100007