Kaolinite dating from Acrisol and Ferralsol: A new key to understanding the landscape evolution in NW Amazonia (Brazil)
| Autor: | Thierry Allard, Guilherme Taitson Bueno, Madeleine Selo, Emmanuel Fritsch, Nádia Regina do Nascimento, Maximilien Mathian, Etienne Balan |
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| Přispěvatelé: | Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Federal University of Goiás – UFG, Instituto de Estudos Socioambientais, Av. Esperança, s/n – Samambaia, Goiânia, GO 74001-970, Brazil, Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University (UNESP), Université Pierre et Marie Curie, Universidade Federal de Goiás (UFG), Universidade Estadual Paulista (Unesp) |
| Rok vydání: | 2020 |
| Předmět: |
Laterite EPR dating Kaolinite Ferralsol/Acrisol transition Amazonia
Earth science Soil Science Weathering Laterite 010501 environmental sciences 01 natural sciences Amazonia Kaolinite Transect 0105 earth and related environmental sciences geography FerralsolAcrisol transition Plateau geography.geographical_feature_category Acrisol Amazon rainforest Landform Ferralsol/Acrisol transition 04 agricultural and veterinary sciences 15. Life on land Saprolite EPR dating [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Geology Chronology |
| Zdroj: | Geoderma Geoderma, Elsevier, 2020, 370, pp.114354. ⟨10.1016/j.geoderma.2020.114354⟩ Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Geoderma, 2020, 370, pp.114354. ⟨10.1016/j.geoderma.2020.114354⟩ |
| ISSN: | 0016-7061 1872-6259 |
| DOI: | 10.1016/j.geoderma.2020.114354 |
| Popis: | Made available in DSpace on 2020-12-12T01:19:49Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-07-01 Ferralsols and Acrisols are major types of soils of the Amazon basin observed on various landform units comprising plateau surfaces, incised hills at their edges and slopes. The present study focuses on an Acrisol developed on plateaus surfaces from northwest Amazonia and a Ferralsol from the convex hills of the incised plateau edges. Local geomorphologic models of weathering covers suggest that Ferralsols are younger than plateau Acrisols but the absolute chronology of their formation is still lacking. This type of information is however critical to understand the evolution of northwest Amazon Basin landscapes and to identify its link with major climatic and geomorphologic events. In this article, kaolinite-rich samples from soils and saprolites belonging to a transect in the São Gabriel da Cachoeira region (Amazon state, Brasil) are investigated. Based on their crystal-chemical characters, several types of kaolinites are identified. Using a previously developed methodology based on electron paramagnetic resonance (EPR) spectroscopy, crystallization ages are proposed for these different kaolinites. Saprolite kaolinites are dated from 6 to 3.6 Ma in the Acrisol profile and display significantly more recent ages ( |
| Databáze: | OpenAIRE |
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