River geochemistry and denudation balance in Tinguaites of the Poços de Caldas, Minas Gerais, Brazil

Authors

  • Diego de Souza Sardinha Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas - UNIFAL.
  • Letícia Hirata Godoy Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho”- UNESP
  • Fabiano Tomazini da Conceição Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho”- UNESP
  • Eder Paulo Spatti Júnior Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho”- UNESP
  • Alexandre Martins Fernandes Faculdade de Engenharia de Bauru, Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP
  • Fernando André de Castro Alves Victal Universidade Federal de Alfenas - UNIFAL, Programa de Pós-Graduação em Ciências Ambientais.
  • Danilo Augusto Toledo Costa Universidade Federal de Alfenas - UNIFAL, Programa de Pós-Graduação em Ciências Ambientais.

DOI:

https://doi.org/10.11606/issn.2316-9095.v18-127313

Keywords:

Geochemical denudation, Relief evolution, Alkaline rocks.

Abstract

The Ariranha Stream basin, Poços de Caldas Volcanic Caldera, Brazil, is formed by tinguaite alkaline rocks (intrusive phonolites). There are not studies on relief evolution in regions with this type of rock, so the present work aimed to evaluate the denudate balance in this hydrographic basin. For this purpose, the following parameters were collected and evaluated during one hydrological year: flow rate (m3/s), precipitation (mm), pH, electrical conductivity (μS/cm), dissolved oxygen (mg/L), total dissolved and suspended solids (mg/L). Flow rate and temperature averages were 0.12 m3/s and 20.80ºC, respectively. The pH values were close to neutrality (6.4); the electrical conductivity varied from 30 to 78 μS/cm; and the dissolved oxygen concentrations from 5.4 to 7.9 mg/L. The total of 15.5 t/km2/year of dissolved material were transported by surface waters, and the atmospheric input was of 6.0 t/km2/year, obtaining an annual removed material by the tinguaite alkaline rocks chemical alteration of 9.5 t/km2/year with weathering rate of 3.6 m/Myr. Regarding the suspended material, approximately 9.9 t/km2/year were transported by drainage, with an atmospheric input of 1.2 t/km2/year. It indicates annual flow of 8.7 t/km2 of removed material associated with the basin soils denudation, or approximately 200 thousand years to change 1 soil meter in the current climatic conditions.

Downloads

Download data is not yet available.

Downloads

Published

2018-03-01

Issue

Vol. 18 No. 1 (2018)

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

Sardinha, D. de S., Godoy, L. H., Conceição, F. T. da, Spatti Júnior, E. P., Fernandes, A. M., Victal, F. A. de C. A., & Costa, D. A. T. (2018). River geochemistry and denudation balance in Tinguaites of the Poços de Caldas, Minas Gerais, Brazil. Geologia USP. Série Científica, 18(1), 259-272. https://doi.org/10.11606/issn.2316-9095.v18-127313