Chemical weathering rate and CO2 consumption in basaltic and sandstone cuesta landscape in São Paulo State, Brazil
DOI:
https://doi.org/10.11606/issn.2316-9095.v19-140702Keywords:
Geochemistry, Hydrochemistry, Water/rock/soil interaction, Tropical regionAbstract
This paper quantified the chemical weathering rate and CO2 consumption in basaltic and sandstone cuesta landscape based on sodium, potassium, calcium, magnesium, and silica elements using the Jaú River, in the state of São Paulo, Brazil, as the study area. The mobility of SiO2, Na+, K+, Ca2+ and Mg2+ elements in the rock/soil system occurs in the alteration stages of potassium feldspar, albite, anorthite, augite, and anorthoclase primary minerals. The rainwater data indicate an annual deposition of 1.28 t/km-2/year for SiO2, 0.60 t/km-2/year for Ca2+, 0.43 t/km-2/year for Mg2+, 0.34 t/km-2/year for K+ and 0.27 t/km-2/year for Na+. In the river waters, the annual specific flow was calculated as 7.11 t/km-2/year for SiO2, 4.72 t/km-2/year for Ca2+, 2.33 t/km-2/year for Na+, 2.44 t/km-2/year for Mg2+ and 0.88 t/km-2/year for K+. The atmospheric/soil CO2 consumption was 0.57x106 mol.km-2/year for the Jaú River basin and when it was extrapolated to the Basaltic Cuestas geomorphological province in São Paulo State, it was estimated as 0.03x1012 mol/year, which is an important consideration to global warming. The chemical weathering rate (10 m/Ma) was compared with other studies in different geomorphological provinces in São Paulo State, which has a variation between 6 and 22 m/Ma.
Downloads
Downloads
Published
Issue
Section
License
Authors who publish in this journal shall comply with the following terms:
- 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.
- 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.
- 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).