Provenance of Palaeozoic sandstones from the Carnic Alps (Austria): petrographic and geochemical indicators |
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| Authors: | Email author" target="_blank">Dieter?MaderEmail author Franz?Neubauer |
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| Institution: | (1) Institut für Geologie und Paläontologie, Paris Lodron Universität Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria;(2) Present address: Institut für Geologische Wissenschaften, Universität Wien, Althanstrasse 14, 1090 Wien, Germany |
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| Abstract: | An integrated approach of petrographic analysis, whole rock geochemistry and microprobe analysis has been applied to obtain information on the geodynamic development and the provenance for Ordovician to Permian siliciclastic successions exposed within the Carnic Alps (Austria). Sandstone detrital mode and geochemical results refine previous geodynamic interpretations. Late Ordovician samples indicate a stable craton and recycled orogenic and, possible, extensional setting. The Early Carboniferous is interpreted to represent a compressional environment, followed by a Late Carboniferous molasse-type foreland basin, and a Permian extensional geodynamic setting. Contrasting geochemical patterns of post-Variscan and Permian sequences suggest a rift setting. Electron microprobe data of detrital white mica also indicate changes in the provenance. Compositional data reflect a shift from low- to medium-grade metamorphic (Ordovician) to high-grade metamorphic (Carboniferous) to low- to medium-grade metamorphic and plutonic source rocks (Permian). Additionally, our data show that various chemical discrimination diagrams do not include all possible ranges of sandstones, and that high contents of detrital mica and ultra-stable heavy minerals may cause misclassification. Consequently, we propose the use of multi-method approach for provenance studies, including the control of geochemical data by modal analysis and heavy mineral investigations. |
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| Keywords: | Detrital mica Detrital mode Palaeozoic Sandstones Southern Alps |
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