Abstract
Fragments of juvenile Siderian continental crust in the Rio Piranhas-Seridó Domain, Borborema Province, Northeastern Brazil, as deduced by zircon U-Pb and whole-rock Sm-Nd systematics
Highlights
The Siderian Period (2.5 to 2.3 Ga) of the Paleoproterozoic era has been the target of intense debate in the world’s geological literature because there is no consensus about its geotectonic evolution
The use of new tools into regional geological mapping, e.g., aerogeophysical data from gamma spectrometry combined with the popularization and refinement of geochronological (U-Pb) and isopotonic (Sm-Nd) methods, has promoted, in recent years, significant advances in the cartographic individualization of geological units other than those already known in the Borborema Province
The present study presents geological, geophysical, isotopic and geochronological integration data, which allowed the individualization of geological units from the Siderian age in two areas located in the central part of the Piranhas-Seridó Domain (PSD)
Summary
The Siderian Period (2.5 to 2.3 Ga) of the Paleoproterozoic era has been the target of intense debate in the world’s geological literature because there is no consensus about its geotectonic evolution. The present study presents geological, geophysical, isotopic and geochronological integration data, which allowed the individualization of geological units from the Siderian age (one of which was proven to be juvenile) in two areas located in the central part of the PSD. This documentation of juvenile Siderian rocks in the PSD contributes to a better understanding of this period in Borborema, as well as as in other areas of Brazil, such as the Bacajá Domain in the Amazon Craton (Vasquez et al 2008) and the Mineiro Belt in the São Francisco Craton (Seixas et al 2012)
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