Integration of geochemical and geophysical data to characterize and map lateritic regolith : an example in the Brazilian Amazon

Iza, E. R. H. F.; Horbe, Adriana Maria Coimbra; Castro, C. C.; Herrera, I. L. I. E.

Registro completo de metadados

Campo DC	Valor	Idioma
dc.contributor.author	Iza, E. R. H. F.	-
dc.contributor.author	Horbe, Adriana Maria Coimbra	-
dc.contributor.author	Castro, C. C.	-
dc.contributor.author	Herrera, I. L. I. E.	-
dc.date.accessioned	2019-11-29T14:33:26Z	-
dc.date.available	2019-11-29T14:33:26Z	-
dc.date.issued	2018-09	-
dc.identifier.citation	Iza, E. R. H. F. et al. Integration of geochemical and geophysical data to characterize and map lateritic regolith: an example in the Brazilian Amazon. Geochemistry, Geophysics, Geosystems, v.19, n. 9, p. 3254–3271, set. 2018. DOI: https://doi.org/10.1029/2017GC007352.	pt_BR
dc.identifier.uri	https://repositorio.unb.br/handle/10482/35900	-
dc.language.iso	Inglês	pt_BR
dc.publisher	American Geophysical Union	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Integration of geochemical and geophysical data to characterize and map lateritic regolith : an example in the Brazilian Amazon	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Geoquímica	pt_BR
dc.subject.keyword	Geofísica	pt_BR
dc.subject.keyword	Amazônia - Brasil	pt_BR
dc.identifier.doi	https://doi.org/10.1029/2017GC007352	pt_BR
dc.relation.publisherversion	https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2017GC007352	pt_BR
dc.description.abstract1	In tropical regions like the Amazon, there are extensive lateritic covers that have not been properly mapped, despite their economic-bearing minerals and their importance related to denudation and regolith landscape studies. To consolidate tools for regolith cartography, geochemical and geophysical data (airborne gamma ray spectrometry and magnetometry) were integrated. Regional indexes (including the weathering intensity index, WII; lateritic index, LI; and mafic index, MI) were generated and applied, which allowed for the identification of regolith properties. The WII highlighted areas with high weathering levels located between 149 and 300 m and between 500 and 627 m of altitude that are related to the lower planation surface and upper planation surfaces, respectively. The LI ratified the WII and highlighted areas with high Th/K and U/K ratios, associated with lateritic duricrusts. The correlation between LI and MI showed lateritic duricrusts related to mafic and felsic substrates, especially on altitudes below 300 m, which confirmed the geochemical data. All of these results lead to the reinterpretation of areas previously considered to be sedimentary as residuals associated with oxisols and lateritic duricrusts, and this allows us to propose that the regolith mapping techniques and model generation (weathering intensity and lateritic indexes) have a good level of reliability.	pt_BR
dc.rights.holder	©2018. American Geophysical Union. All Rights Reserved.	-
dc.identifier.orcid	http://orcid.org/0000-0002-9152-4816	pt_BR
Aparece nas coleções:	Artigos publicados em periódicos e afins