The separation of multi-element spatial patterns in till geochemistry of southeastern Sweden combining GIS, principal component analysis and high-dimensional visualization
2007 (English)In: Geochemistry: Exploration, Environment, Analysis, ISSN 1467-7873, Vol. 7, no 4, 303-318 p.Article in journal (Refereed) Published
The chemical composition of glacial till is a product of parentrocks, glacial and post-glacial processes and reflects the geogenicvariation of chemical elements. Contrasting chemical compositionof rock types together with spatial variation in distributionpatterns of metals in the fine fraction of till in southeasternSweden assists in the identification of the signatures reflectingparent rocks in glacial till samples. The spatial patterns ofCu, Co, Ni, Pb, V and Zn in 1411 till samples were presentedby point symbol maps, followed by the extraction of multi-elementassociations by employing principal component analysis (PCA)and interactive high-dimensional visualization. The most influentialmulti-element spatial patterns in till data could be separatedusing either the numerical (PCA) or the visual approach. However,more information was extracted by combining the two techniques.In addition, interactive visualization provided an objectivepresentation of complex information in sparse lithogeochemicaldata. The study resulted in new knowledge about the naturalvariation of the levels of six elements in till, and a graphicalpresentation to convey information about and compare multi-elementgeochemical signatures.
Place, publisher, year, edition, pages
2007. Vol. 7, no 4, 303-318 p.
Multi-element spatial patterns, Southeastern Sweden, Till geochemistry, Visualization
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-5030DOI: 10.1144/1467-7873/06-117ISI: 000250859200003ScopusID: 2-s2.0-36148937858OAI: oai:DiVA.org:kth-5030DiVA: diva2:7637
QC 201006092005-04-182005-04-182011-11-03Bibliographically approved