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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Giovanardi, T. [1, 2] ; Girardi, V. A. V. [2] ; Correia, C. T. [2] ; Sinigoi, S. [3] ; Tassinari, C. C. G. [2] ; Mazzucchelli, M. [1]
Total Authors: 6
Affiliation:
[1] Univ Modena & Reggio Emilia, Dipartimento Sci Chim & Geol, I-41121 Modena - Italy
[2] Univ Sao Paulo, Inst Geociencias, Rua Lago 563, Cidade Univ, BR-05508900 Sao Paulo - Brazil
[3] Univ Trieste, Dipartimento Geosci, I-34128 Trieste - Italy
Total Affiliations: 3
Document type: Journal article
Source: OPEN GEOSCIENCES; v. 7, n. 1, p. 197-206, JAN 2015.
Web of Science Citations: 6
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 theNiquelndia 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 of Niquelndia. Discordant older Pb-206/U-238 ages are provided by inherited zircons, and match the age of the metamorphism of the embedding Palmeirpolis Sequence. (AU)

FAPESP's process: 11/50307-0 - Petrology and geochemistry of mafic-ultramafic rocks from selected areas: tectonic and metallogenetic implications
Grantee:Vicente Antonio Vitorio Girardi
Support Opportunities: Regular Research Grants
FAPESP's process: 97/00640-5 - Mafic-ultramafic typologies and associated mineral deposits
Grantee:Vicente Antonio Vitorio Girardi
Support Opportunities: Research Projects - Thematic Grants