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formerly Central European Journal of Geosciences

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U-Pb zircon SHRIMP data from the Cana Brava layered complex: new constraints for the mafic-ultramafic intrusions of Northern Goiás, Brazil

T. Giovanardi
  • Instituto de Geociências Universidade de São Paulo, Rua do Lago 563, Cidade Universitária, 05508-900 São Paulo, Brazil
  • Dipartimento di Geoscienze, Università degli Studi di Trieste, Via E.Weiss 8, 34128 Trieste Italy
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ V. A. V. Girardi
  • Dipartimento di Geoscienze, Università degli Studi di Trieste, Via E.Weiss 8, 34128 Trieste Italy
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ C. T. Correia
  • Dipartimento di Geoscienze, Università degli Studi di Trieste, Via E.Weiss 8, 34128 Trieste Italy
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  • De Gruyter OnlineGoogle Scholar
/ S. Sinigoi
  • Instituto de Geociências Universidade de São Paulo, Rua do Lago 563, Cidade Universitária, 05508-900 São Paulo, Brazil
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  • De Gruyter OnlineGoogle Scholar
/ C. C. G. Tassinari
  • Instituto de Geociências Universidade de São Paulo, Rua do Lago 563, Cidade Universitária, 05508-900 São Paulo, Brazil
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  • De Gruyter OnlineGoogle Scholar
/ M. Mazzucchelli
  • Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio, Emilia, Largo S. Eufemia 19, 41121 Modena, Italy
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-08-13 | DOI: https://doi.org/10.1515/geo-2015-0015

Abstract

The Cana Brava Complex is the northernmost and least well known layered intrusion of a discontinuous belt of mafic-ultramafic massifs within the Brasilia Belt, which also comprises theNiquelândia and Barro Alto complexes. Available geochronological data from a range of techniques (K/Ar, Ar/Ar, Rb/Sr, Sm/Nd and U/Pb) provide a range of possible ages (time span from 3.9 Ga to 450 Ma), hence a precise and reliable age for the Cana Brava Complex is still lacking. Also, preliminary isotopic and geochemical data of the Cana Brava Complex suggest a significant crustal contamination, which could have affected bulk-rock Sr and Nd systematics resulting in meaningless age determinations. In this paper, we present new U-Pb SHRIMP zircon analyses from four samples of different units of the Cana Brava Complexwhich suggest that the intrusion occurred during the Neoproterozoic, between 800 and 780 Ma, i.e. at the same age ofNiquelândia. Discordant older 206Pb/238U ages are provided by inherited zircons, and match the age of the metamorphism of the embedding Palmeirópolis Sequence.

Keywords: Cana Brava; Layered Complex; Geochemistry; Zircon; SHRIMP

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About the article

Received: 2014-03-18

Accepted: 2014-10-15

Published Online: 2015-08-13


Citation Information: Open Geosciences, Volume 7, Issue 1, ISSN (Online) 2391-5447, DOI: https://doi.org/10.1515/geo-2015-0015.

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©2015 T. Giovanardi et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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[2]
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Lithos, 2017, Volume 282-283, Page 339
[3]
Tommaso Giovanardi, Vicente A. V. Girardi, Ciro T. Correia, Silvano Sinigoi, Colombo C. G. Tassinari, and Maurizio Mazzucchelli
Mineralogy and Petrology, 2017, Volume 111, Number 2, Page 291

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