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Application of the empirical discriminant function to regional geochemical data from the United Kingdom

1976; Geological Society of America; Volume: 87; Issue: 11 Linguagem: Inglês

10.1130/0016-7606(1976)87 2.0.co;2

1943-2674

Rolando Castillo-Muñoz, Richard J. Howarth,

Atmospheric and Environmental Gas Dynamics

Research Article| November 01, 1976 Application of the empirical discriminant function to regional geochemical data from the United Kingdom ROLANDO CASTILLO-MUÑOZ; ROLANDO CASTILLO-MUÑOZ 1Directión de Geología, Minas y Petroleo and Escuela Centroamericana de Geología, Universidad de Costa Rica, San José, Costa Rica Search for other works by this author on: GSW Google Scholar RICHARD J. HOWARTH RICHARD J. HOWARTH 2Applied Geochemistry Research Group, Imperial College, London SW7 2BP, England Search for other works by this author on: GSW Google Scholar Author and Article Information ROLANDO CASTILLO-MUÑOZ 1Directión de Geología, Minas y Petroleo and Escuela Centroamericana de Geología, Universidad de Costa Rica, San José, Costa Rica RICHARD J. HOWARTH 2Applied Geochemistry Research Group, Imperial College, London SW7 2BP, England Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1976) 87 (11): 1567–1581. https://doi.org/10.1130/0016-7606(1976)87 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ROLANDO CASTILLO-MUÑOZ, RICHARD J. HOWARTH; Application of the empirical discriminant function to regional geochemical data from the United Kingdom. GSA Bulletin 1976;; 87 (11): 1567–1581. doi: https://doi.org/10.1130/0016-7606(1976)87 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The nonparametric empirical discriminant function was applied to stream-sediment geochemical data from the Derbyshire and Denbighshire areas in the United Kingdom in an attempt to predict both the stratigraphic affinity and occurrence of mineralization in the local bed rock. The discriminant functions were defined on the basis of small "training sets" of samples collected from the important geologic features of the two areas; we were successful in correctly assigning 63 and 56 percent of the stream sediments in both areas to their proper stratigraphic or mineralization class for the two areas. Log transformation of the geochemical data materially improved the classification rate. The technique seems clearly to be of use in efficiently recognizing (1) bedrock areas of geochemical similarity, despite the presence of mixed lithologies in the bedrock formations and the presence of extensive glacial overburden and (2) localized areas of unusual geochemistry due to manganese enhancement (scavenging?) in the secondary environment or to past mining and smelting activities. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.