NDLI: Iron Quadrangle stream sediments, Brazil: geochemical maps and reference values

Content Provider	Springer Nature Link
Author	Vicq, Raphael Matschullat, Jörg Leite, Mariangela Garcia Praça Nalini Junior, Hermínio Arias Mendonça, Fellipe Pinheiro Chagas
Copyright Year	2015
Abstract	Geochemical mapping and the determination of reference values receive increasing attention. The need to know regional geochemical background data as well as the spatial allocation of areas with anomalous geochemical concentrations and chances to identify their major sources motivate the interest. Here, results from a high-density geochemical mapping exercise and derived related reference values are presented; 541 stream sediment samples have been collected across the Iron Quadrangle (IQ), Brazil, with a density of one sample per 13 km$^{2}$. Geochemical maps were compiled using the inverse distance weighted interpolation method. “Normal” concentrations were distinguished from anomalies with the separation-by-concentration-range technique, where positive anomalies are defined by the “boxplot” Upper Inner Fence (UIF) rule. More than 70 % of the IQ show exclusively geogenic concentration ranges for the elements studied. About 20 % represent positive anomalies, likely related to both near surface rock types and to human interference. Distinct anthropogenic anomalies, notably from mining activities explain 5–10 % of all samples. This first high-density sampling in the IQ allows delineating the role of lithology on the elemental composition of stream sediments, and to establish reference values for the main river basins—thus pinpointing localities, cities and fluvial basins that are exposed to environmental risks and need to be protected.
Starting Page	4407
Ending Page	4417
Page Count	11
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	5
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-05-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemical background Reference values High-density geochemical mapping Minas Gerais Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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