Document Type
Article
Publication Date
12-3-2018
Department
Department of Geological and Mining Engineering and Sciences; Department of Physics
Abstract
The original connections of Archean cratons are becoming traceable due to an increasing amount of paleomagnetic data and refined magmatic barcodes. The Uauá block of the northern São Francisco craton may represent a fragment of a major Archean craton. Here, we report new paleomagnetic data from the 2.62 Ga Uauá tholeiitic mafic dyke swarm of the Uauá block in the northern São Francisco craton, Eastern Brazil. Our paleomagnetic results confirm the earlier results for these units, but our interpretation differs. We suggest that the obtained characteristic remanent magnetization for the 2.62 Ga swarm is of primary origin, supported by a provisionally-positive baked contact test. The corresponding paleomagnetic pole (25.2°N, 330.5°E, A95 = 8.1°, N = 20) takes the present northern part of the São Francisco craton to moderate latitudes. Based on the comparison of the paleolatitudes of cratons with high-quality paleomagnetic data and magmatic barcodes, we suggest that the northern part of the São Francisco craton could have been part of the proposed Supervaalbara supercraton during the Archean. Supervaalbara is proposed as including (but not limited to) the part of the São Francisco craton as well as the Superior, Wyoming, Kola + Karelia, Zimbabwe, Kaapvaal, Tanzania, Yilgarn, and Pilbara cratons.
Publication Title
Precambrian Research
Recommended Citation
Salminen, J.,
Oliveira, E. P.,
Piispa, E. J.,
Smirnov, A.,
&
Trindade, R. I.
(2018).
Revisiting the paleomagnetism of the Neoarchean Uauá mafic dyke swarm, Brazil: Implications for Archean supercratons.
Precambrian Research,
329, 108-123.
http://doi.org/10.1016/j.precamres.2018.12.001
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/443
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Version
Publisher's PDF
Publisher's Statement
© 2018 The Authors. Published by Elsevier B.V. Article deposited here in compliance with publisher policies. Publisher's version of record: https://doi.org/10.1016/j.precamres.2018.12.001