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• W2128355989 abstract "156 abstract We present a study of the bulk-rock geochemistry including Nd and Pb isotopes of siliciclastic metasedimentary rocks of the Austroalpine basement south of the Tauern Window in combination with detrital zircon U-Pb-dating by LA-SF-ICP-MS. Source-area composition signals show a strong contrast of the granitoid-detritus dominated older pre-EarlyOrdovician metasediments against the younger Thurntaler Phyllite Group. The trace elements of the latter indicate various mafic and felsic, possibly volcanogenic admixtures to a very mature pelite background sedimentation that seems to be derived from an evolved source possibly with more mafic components than the former. A continental arc is clearly indicated by major and stable trace element characteristics for the tectonic setting of deposition of immature wacke-type metapsammites of the pre-Early-Ordovician units while the high maturity of the Thurntaler Group metapelites points to stable platform-type sedimentation In most meta-arenites of the pre-Early-Ordovician units older well-recycled crustal components with high average crustal residence ages near 2 Ga and lowest eNd(t) (-10) are predominant, while metapelites and many metawackes contain variable proportions of more juvenile components with lower model ages, ranging from 2.0 to 1.5 Ga, and less negative eNd(t) up to -4 . The Thurntaler Phyllite Group pelites are special in showing a very narrow spread of model ages around 1.85 Ga and a systematic trend of eNd(t) increasing from -10 to -7 with the 147Sm / 144Nd ratio, probably due to more juvenile admixtures. The narrow range of lead isotope ratios 207Pb / 204Pb and 208Pb / 204Pb against 206Pb / 204Pb indicates old cratonic reservoirs as sources for all the studied metasediments. According to the youngest detrital zircons observed in this study, and considering the Ordovician zircon protolithages of intercalated orthogneisses established earlier, the age of sedimentation of the Defereggen Group and Gailtal Metamorphic basement paragneisses may be bracketed between Early Cambrian and pre-Early Ordovician. The age distribution in detrital zircons is dominated by populations of 600 700 Ma, probably delivered from the eroding Avalonian-Cadomian Belt and/or the Pan-African orogens. A very prominent „Grenvillian age“ detrital zircon population (950 1050 Ma) is interpreted to have been supplied from Eastern Gondwanan source regions. The age gap between 1100 -1700 Ma indicates that Baltica can be almost ruled out as a source region. Following the conclusions from studies in other peri-Gondwanan units, the Saharan Metacraton/Trans-Saharan Basement and the West-African craton can be considered as the sources for Paleoproterozoic and Neoarchean sub-populations at 1700 2300 Ma, 2550 Ma and 2750 Ma in the Austroalpine metasediments. 1 Geoscience Centre of the Georg-August University Gottingen, Goldschmidtstr. 3, 37077, Gottingen, Germany 2 Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa 3 Institut fur Mineralogie, TU Bergakademie, Brennhausgasse 14, D-09596 Freiberg/Saxony, Germany." @default.
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• W2128355989 date "2013-01-01" @default.
• W2128355989 modified "2023-09-26" @default.
• W2128355989 title "Provenance signatures from whole-rock geochemistry and detrital zircon ages of metasediments from The Austroalpine Basement South of the Tauern Window(Eastern Tyrol, Austria)" @default.
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