The dykes in the western fringe of the Ybytyruzú Hills, central‑eastern Paraguay region

Authors

  • Celso de Barros Gomes Institute of Geosciences, Universidade de São Paulo ‑ USP
  • Ana Maria Castillo Clerici Clerici Technical Coordinator attached. Framework Program La Plata Basin, Buenos Aires, Argentina
  • Victor Velázquez Fernandez School of Arts, Sciences and Humanities, Universidade de São Paulo ‑ USP
  • Angelo De Min Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy
  • Piero Comin‑Chiaramonti Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy

DOI:

https://doi.org/10.11606/issn.2316-9095.v17-121977

Keywords:

Ybytyruzú, Eastern Paraguay, Potassic Alkaline Dykes.

Abstract

The Cordillera del Ybytyruzú region of central‑eastern Paraguay is predominantly formed by tholeiitic lava flows from the Early Cretaceous age (130–134 Ma) cut by K‑alkaline dykes and intrusive bodies aged between 125 and 127 Ma. Petrochemical studies focusing on 14 samples of dykes from the region show an apparent affinity to Roman Province Type rocks and total consistency with the overall petrographic association of the Asunción‑Sapucai‑Villarrica (ASV) graben. Two main potassic suites are distinguished: B‑P (basanite‑tephrite‑phonotephrite‑phonolite) and AB‑T (alkali basalt‑trachybasalt‑trachyandesite‑trachyphonolite/trachyte).The occurrence of lamproitic rocks in the area has so far not been confirmed.

Downloads

Download data is not yet available.

Downloads

Published

2017-08-01

Issue

Vol. 17 No. 2 (2017)

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

Gomes, C. de B., Clerici, A. M. C. C., Fernandez, V. V., Min, A. D., & Comin‑Chiaramonti, P. (2017). The dykes in the western fringe of the Ybytyruzú Hills, central‑eastern Paraguay region. Geologia USP. Série Científica, 17(2), 131-141. https://doi.org/10.11606/issn.2316-9095.v17-121977