Relationships between shearing and granitic magma emplacement: the Remígio-Pocinhos shear zone in the São José do Campestre massif, NE Brazil

Authors

  • Rielva Solimairy Campelo do Nascimento Universidade Federal do Amazonas; Instituto de Ciências Exatas; Departamento de Geociências
  • Ian McReath Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Antônio Carlos Galindo Universidade Federal do Rio Grande do Norte; Instituto de Ciências Exatas; Departamento de Geologia

DOI:

https://doi.org/10.5327/Z1519-874X2010000300001

Keywords:

Seridó region, Shear zones, Emplacement of granite magmas, Diversity of granite types, Transitional granite types

Abstract

Based on mineralogical, geochemical and textural characteristics, a variety of granite types was identified amongst the intrusions emplaced during the tectonic activity along the Remígio-Pocinhos shear zone in NE Brazil during the latest stages of the Brasiliano orogeny. They include peraluminous granites with I-type mineralogical compositions as well as transitional-to-alkaline geochemical characteristics. These granites contain mafic to intermediate microgranular enclaves. Overall, they are very similar to many other Brasiliano-age plutons in the extreme NE of Brazil. Metaluminous alkaline granites with aegirine-augite usually contain andradite as a minor phase, and titanite as an important accessory mineral. Several aspects of their trace element geochemistry repeat features of syn to late- tectonic alkaline granites in other parts of NE Brazil and in the rest of the world. The shear zone has deep roots, and the heat flow during granite genesis was probably high. A variety of lower crustal source rocks was probably involved in the genesis of these granites.

Downloads

Download data is not yet available.

References

Downloads

Published

2010-10-01

Issue

Vol. 10 No. 3 (2010)

Section

Articles

License

Authors who publish in this journal shall comply with the following terms: 

  1. Authors keep their copyright and grant to Geologia USP: Série Científica the right of first publication, with the paper under the Creative Commons BY-NC-SA license (summary of the license: https://creativecommons.org/licenses/by-nc-sa/4.0 | full text of the license: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode) that allows the non-commercial sharing of the paper and granting the proper copyrights of the first publication in this journal.
  2. Authors are authorized to take additional contracts separately, for non-exclusive distribution of the version of the paper published in this journal (publish in institutional repository or as a book chapter), granting the proper copyrights of first publication in this journal.
  3. Authors are allowed and encouraged to publish and distribute their paper online (in institutional repositories or their personal page) at any point before or during the editorial process, since this can generate productive changes as well as increase the impact and citation of the published paper (See The effect of Open Access and downloads on citation impact).

How to Cite

Nascimento, R. S. C. do, McReath, I., & Galindo, A. C. (2010). Relationships between shearing and granitic magma emplacement: the Remígio-Pocinhos shear zone in the São José do Campestre massif, NE Brazil . Geologia USP. Série Científica, 10(3), 3-18. https://doi.org/10.5327/Z1519-874X2010000300001