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Cathodoluminescence of heavy minerals – a new tool for provenance analysis as revealed for fluviatile sands of Miocene age of the Northern Alpine Foreland Molasse

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Cathodoluminescence investigations on medium-grained heavy mineral fractions (100-250 μm) from the Miocene siliciclastics in the vicinity of the Graupensandrinne and nearly time-equivalent units with Alpine derivation of the Northern Alpine Molasse show significant differences. Due to the distribution of kyanite types as well as the presence of topaz, the sediments in the area of the Graupensandrinne are interpreted to be derived from the western Bohemian Massif, whereas the crystalline material of Alpine provenance of time-equivalent Northern Alpine Molasse sediments derived largely from the central part of the Eastern Alps, especially the Ötztalkristallin. For the deposits of the Graupensandrinne area, no significant differences exist between the heavy mineral facies east and west of the Ries impact site. Therefore, it is concluded that the major part of the sediments in this area was derived from a conspicuous part of the Bohemian Massif, i.e. the Oberpfälzer Wald and the Fichtelgebirge.

German
Kathodolumineszenz-Untersuchungen an Schwermineralen mittelkörniger Fraktionen (100-250 μm) von miozänen Siliziklastika aus dem Umfeld der Graupensandrinne und nahezu zeitlich äquivalenter Einheiten mit alpiner Herkunft in der nordalpinen Molasse zeigen signifikante Unterschiede. Die Sedimente aus dem Bereich der Graupensandrinne stammen aufgrund von Disthen-Typenverteilung sowie Topasanteilen aus der westlichen Böhmischen Masse, während das Kristallin-Material der alpinen, zeitgleichen nordalpinen Molassesedimente hauptsächlich aus dem zentralen Teil der Ostalpen (besonders dem Ötztalkristallin) stammt. Bei den Füllungen im Umfeld der Graupensandrinne besteht kein signifikanter Unterschied zwischen den Ablagerungen östlich und westlich des Rieseinschlags. Daher stammt das Material aus einem bestimmten Bereich der Böhmischen Masse, nämlich dem Oberpfälzer Wald und dem Fichtelgebirge.
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Keywords: CATHODOLUMINESCENCE SPECTROSCOPY; GRAUPENSANDRINNE; HEAVY MINERAL ASSEMBLAGES; KYANITE; TOPAZ

Document Type: Research Article

Publication date: 2009-10-01

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