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Geochemical mapping of major and trace elements in soils from the Altiplano Potosino, Mexico; a multi-scale comparison

Jorge A. Chipres, J. C. Salinas, J. Castro Larragoitia and M. G. Monroy
Geochemical mapping of major and trace elements in soils from the Altiplano Potosino, Mexico; a multi-scale comparison
Geochemistry - Exploration, Environment, Analysis (November 2008) 8 (3-4): 279-290

Abstract

A geochemical survey of the Altiplano Potosino, Mexico, was conducted at three different scales (i.e. sample density). A study representing a national-scale geochemical mapping programme sampled 16 sites at a density of 1 site per 1600 km (super 2) within a 160X160 km cell. A second study representing regional-scale mapping sampled 100 sites at a density of 1 site per 16 km (super 2) within a 40X40 km cell selected from within the larger cell. A third study representing local-scale mapping sampled 100 sites at a density of 1 site per km (super 2) in a selected 10X10 km cell within the regional-scale 40X40 km cell. A comparison of four environmentally important elements (Ag, As, Cd and Hg) showed the widest range of concentrations at the local scale. This was attributed to the presence of soils developed on mineralized bedrock. The smallest range was observed for the low-density national-scale survey sampling. The extent of mineralized areas was very small with respect to this scale. Mercury showed a relatively large range of concentrations at the regional scale because the selected 40X40 km cell contained mercury-bearing mineral deposits. Geochemical mapping projects conducted at different scales generally complement each other. Very low sample density studies at a continental or national scale will outline the broad variations in the geochemistry of the sample medium caused by such factors as changes in rock type (soil parent material) or large-scale differences in climate. Studies at local scales are more likely to identify effects of human activity as well as natural processes affecting small areas of the Earth's surface. Based on data generated from such surveys, exploratory and spatial data analysis can be used to propose a range of values representing background concentrations of potentially toxic elements in soil.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 8
Serial Issue: 3-4
Title: Geochemical mapping of major and trace elements in soils from the Altiplano Potosino, Mexico; a multi-scale comparison
Affiliation: Universidad Autonoma de San Luis Potosi, Centro de Estudios, Asesoria y Servicios en Sistemas Ambientales, San Luis Potosi, Mexico
Pages: 279-290
Published: 200811
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 43
Accession Number: 2008-110284
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N22°00'00" - N23°30'00", W102°00'00" - W100°00'00"
Secondary Affiliation: Servicio Geologico Mexicano, MEX, Mexico
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, 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: 200840
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