Weathering in the Tropics: A Multidisciplinary Approach

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".

Deadline for manuscript submissions: closed (9 May 2023) | Viewed by 1522

Special Issue Editors


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Guest Editor
Department of Geography and Environmental Planning, Universidade Estadual Paulista (UNESP), Rio Claro, SP, Brazil
Interests: surface and environmental geochemistry; geochronology and landscape evolution

E-Mail Website
Guest Editor
Department of Geography and Environmental Planning, Universidade Estadual Paulista (UNESP), Rio Claro, SP, Brazil
Interests: hydrochemistry; environmental geochemistry; landscape evolution

Special Issue Information

Dear Colleagues,

Chemical weathering plays an important role in shaping the Earth’s surface, and it functions to moderate the terrestrial climate due to atmospheric/soil CO2 consumption during water–rock interactions.

Mass balances based on fluvial geochemistry have been carried out to quantify the removal of elements from continents to oceans and the impact of chemical weathering on the global carbon cycle, where inputs from rainfall require corrections. These studies have mainly have focused on basaltic and granitic watersheds in areas under various climates, reliefs and land uses.

Long-term weathering rates can be inferred from the ages of the weathering profiles preserved at a given landscape position, using 40Ar/39Ar and (U-Th)/He geochronology in supergene minerals, providing insight into the rates of landscape evolution in stable cratonic areas. In addition, the chemical weathering processes in the tropics are the main processes responsible for areas hosting significant supergene ore deposits, especially Al, Fe, Mn, Ni, Nb and P deposits.

Thus, this Special Issue aims to contribute with new studies related to the chemical weathering in the tropics, generating useful knowledge for mineral chemical weathering, atmospheric/soil CO2 consumption, geochronology of weathering profiles, landscape evolution and supergenic deposits.

Dr. Fabiano Tomazini Conceição
Dr. Alexandre Martins Fernandes
Guest Editors

Manuscript Submission Information

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Keywords

  • chemical weathering 
  • atmospheric/soil CO2 consumption 
  • water–rock interactions and watersheds 
  • geochronology of weathering profiles 
  • landscape evolution 
  • supergene deposits

Published Papers (1 paper)

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Research

16 pages, 5167 KiB  
Article
The Mineralogy, Geochemistry and Origin of the Supergene Manganese Occurrences in the Southern Minas Gerais, Brazil
by Davi Diorio Parrotti, Fabiano Tomazini da Conceição and Guillermo Rafael Beltran Navarro
Minerals 2023, 13(9), 1216; https://doi.org/10.3390/min13091216 - 15 Sep 2023
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Abstract
In equatorial and tropical regions, supergene mineral deposits created during water/rock interactions are found. Simply put, these supergene deposits are formed through the accumulation of low solubility ions or through the preservation of primary minerals. The supergene manganese (Mn) deposits are examples of [...] Read more.
In equatorial and tropical regions, supergene mineral deposits created during water/rock interactions are found. Simply put, these supergene deposits are formed through the accumulation of low solubility ions or through the preservation of primary minerals. The supergene manganese (Mn) deposits are examples of the economic importance associated with the chemical weathering processes. In Brazil, the Southern Brasilia Orogen (SBO) was generated during the collision between the Paranapanema Craton and the passive margin of the São Francisco Craton. In the southern Minas Gerais (MG), several supergene Mn occurrences are hosted in the SBO, which were originated during the chemical weathering of gondites belonging to the Amparo Complex. Here, we studied the supergene Mn occurrences in the southern MG, more specifically in the municipalities of Ouro Fino and Careaçu. The MnO contents ranged from 25.50 to 28.40 wt% at Ouro Fino and from 16.80 to 21.20 wt% at Careaçu. These supergene Mn deposits have a diverse mineral assemblage, being composed of spessartine, quartz, Mn-oxides, goethite and kaolinite. The various Mn minerals formed due to spessartine incongruent dissolution were hollandites, cryptomelanes, romanechites, pyrolusites and lithiophorites. Both study areas are relevant for the possible opening of mines for the commercialization of Mn. Full article
(This article belongs to the Special Issue Weathering in the Tropics: A Multidisciplinary Approach)
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