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Comparison of geochemical data derived from till and lake sediment samples, Labrador, Canada

A. N. Rencz, R. A. Klassen and A. Moore
Comparison of geochemical data derived from till and lake sediment samples, Labrador, Canada
Geochemistry - Exploration, Environment, Analysis (February 2001) 2, Part 1: 27-35

Abstract

Techniques for combining geochemical data from a till survey (2438 samples) and a lake sediment survey (17 447 samples) are assessed to determine a rigorous method for comparing the two sampling media. This study is based on five elements, (Cu, Ni, Fe, Pb and Zn) from overlapping geochemical surveys in Labrador, Canada. Two methods for comparing the till and lake sediment geochemical data are: (1) gridding and (2) nearest neighbor. Pearson correlation coefficients between media are low (<0.2) for Cu, Fe and Zn and only Ni has a correlation significant at the 95% confidence level (r (super 2) = 0.45). Results from gridding show slightly higher correlations. Differences are most evident at the extremes, as anomalously high element concentrations in one medium typically do not correlate with high values in the other medium. Correlations between media increase as distance decreases for Ni, Pb and Zn; however, no such trend is evident for Cu or Fe. The nearest neighbor method has several advantages: this procedure retains the original data and it permits calculation of statistics such as distance and direction between the points. The differences between the geochemical results from the two media highlight the synergistic value of multi-media geochemical sampling.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 2, Part 1
Title: Comparison of geochemical data derived from till and lake sediment samples, Labrador, Canada
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Pages: 27-35
Published: 200102
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 25
Accession Number: 2003-021798
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
N51°30'00" - N61°00'00", W67°30'00" - W55°30'00"
N46°30'00" - N51°40'00", W59°19'60" - W52°30'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200307
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