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The Schefferville area: multivariate analysis and variography used to enhance interpretation of lake sediment geochemical data

Authors
Journal
Journal of Geochemical Exploration
0375-6742
Publisher
Elsevier
Publication Date
Volume
38
Issue
3
Identifiers
DOI: 10.1016/0375-6742(90)90113-o
Disciplines
  • Chemistry
  • Earth Science

Abstract

Abstract The geochemistry of 3554 center-lake-bottom sediments was determined in 1983 in the Schefferville area by the “Ministère de l'Energie et des Ressources du Québec”. Thirty-eight elements were analyzed. This paper describes an attempt to filter out influences related to extraneous factors, other than mineralization, using two multivariate techniques, linear regression and principal-component analysis. In addition, variograms were used extensively as interpretive aids. A regression analysis involving metallic elements as dependent variables, and elements characteristics of the lithology as regressors, proved very successful in reducing the level of the background signal. Further enhancement was achieved through the use of principal-component analysis whereby regional factors were identified and filtered out. One of the main findings was a different map of anomalies for Ni where the influence of lithology and other regional factors seemed to be reduced. A clustering of Ni anomalies near Schefferville came to light following this statistical treatment.

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