Open AccessHalbquantitative, röntgendiffraktometrische Schwermineral‐analyse glazialer Ablagerungen SO‐Schonens (Schweden)
Author(s) -
VORTISCH WALTER
Publication year - 1977
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1111/j.1502-3885.1977.tb00295.x
Subject(s) - petrography , geology , ilmenite , zircon , apatite , mineralogy , geochemistry , heavy mineral , epidote , mineral , andalusite , amphibole , rutile , glacial period , metamorphic rock , geomorphology , paleontology , materials science , provenance , quartz , chlorite , metallurgy
For petrographic studies of glacial deposits, semi‐quantitative X‐ray diffraction analysis was tested as a time‐saving method. Reproducible mounts with random orientation were produced with an acetate cement as mounting medium. For simplicity the number of minerals was reduced through electromagnetic separation. Weichsel deposits in SE Scania were sampled. Anatase, andalusite, apatite, rutile, zircon (‘nonmagnetic fraction’) and amphibole, epidote, ilmenite (‘magnetic fraction’) were chosen for semi‐quantitative evaluation of diffraction patterns. Standard deviation was calculated for selected samples. With the method employed here, it is possible to distinguish or correlate samples of a group of glacial deposits from relatively similar heavy‐mineral associations. The Baltic tills and underlying glaciofluvial sands differ consistently from the NE tills, for example through a higher rutile and a lower apatite content. If there is no time or technical possibility for optical investigations, useful petrographic parameters may be rapidly recognized by the method described. Minerals usually not identified optically (c.g. ilmenite) may likewise be chosen for this analytical technique.