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Geochemical mapping and estimation of background concentrations in soils of Carajas mineral province; eastern Amazonian Craton, Brazil

Gabriel Negreiros Salomao, Roberto Dall'Agnol, Romulo S. Angelica, Marco Aurelio Figueiredo, Prafulla K. Sahoo, Carlos A. de Medeiros Filho and Marlene F. da Costa
Geochemical mapping and estimation of background concentrations in soils of Carajas mineral province; eastern Amazonian Craton, Brazil
Geochemistry - Exploration, Environment, Analysis (March 2019) 19 (4): 431-447

Abstract

The Brazilian Geological Survey (CPRM-Companhia de Pesquisa de Recursos Minerais) has carried out geochemical surveys focused on the region of Carajas, the largest mineral province in Brazil. One of these surveys, covered the area of Canaa dos Carajas where 257 soil samples, including 32 duplicates, were collected from the B horizon within an area of approximately 3,500 km (super 2) . The <0.177 mm fraction of these samples was sprayed and digested with aqua regia and then analyzed for 53 elements by ICP-AES and ICP-MS. The statistic treatment of the data allowed to elaborate multi-element geochemical maps based on interpolation techniques and establish geochemical background values in soils. Different methods of obtaining geochemical threshold values are presented and compared. The geochemical behavior of 43 elements, including potentially toxic elements, is discussed. Geochemical background values are established using different statistical methods and more relevant results come from the iterative 2sigma technique. The influence of geogenic contribution is largely dominant over anthropogenic effects in the studied area. There is no conclusive evidence of contamination related to human activity at the time when the geochemical survey was carried out. This paper provides multi-element geochemical maps and background values in the most prominent Brazilian mining province.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 19
Serial Issue: 4
Title: Geochemical mapping and estimation of background concentrations in soils of Carajas mineral province; eastern Amazonian Craton, Brazil
Affiliation: Universidade Federal do Para, Instituto de Geociencias, Belem, Brazil
Pages: 431-447
Published: 20190325
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 55
Accession Number: 2019-032131
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch maps
S07°45'00" - S05°30'00", W51°04'60" - W49°00'00"
Secondary Affiliation: Instituto Tecnologico Vale, BRA, BrazilTerrativa, BRA, Brazil
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201917
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