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Litho-, chemo- and magnetostratigraphy of sections of the Werfen Formation at Passo Rolle (western Dolomites) and Rio Fuina (Carnic Alps) / von Federico Faoro
Weitere Titel
Litho-, Chemo- und Magnetostratigraphie der Werfen Fm
VerfasserFaoro, Federico
Betreuer / BetreuerinnenBrandner, Rainer
ErschienenInnsbruck, April 2018
UmfangVIII, 128 Blätter : Illustrationen, Diagramme, Karten
HochschulschriftUniversität Innsbruck, Masterarbeit, 2018
Datum der AbgabeApril 2018
Schlagwörter (DE)Werfen Formation / Indusium Olenekium Grenze / Smithium Spathium Grenze / Südalpin
Schlagwörter (EN)Werfen Fm / Induan-Olenekian Boundary / Smithian-Spathian Boundary / South Alpine Realm
URNurn:nbn:at:at-ubi:1-27166 Persistent Identifier (URN)
 Das Werk ist frei verfügbar
Litho-, chemo- and magnetostratigraphy of sections of the Werfen Formation at Passo Rolle (western Dolomites) and Rio Fuina (Carnic Alps) [17.28 mb]
Zusammenfassung (Englisch)

The Lower Triassic shelf sediments (Werfen Fm) at Passo Rolle (Section 1 - western Dolomites) and Rio Fuina (Section 2- Carnic Alps) show the typical well-known 13C stable isotope curve pattern in both sections, with the positive 13C excursion at the proposed and until now not ratified Induan-Olenekian Boundary (maximum value of 6,27 at Rio Fuina and 3,63 at Passo Rolle). Rapid positive shift of the 13C curve occurring at the Smithian-Spathian transition was observed along the Fuina section (4,23 ), while at Passo Rolle the boundary is not exposed. Besides the magnitude of the positive excursions, the 13C curves are well correlated. However, lateral facies and thickness changes between the sections are present. They can be interpreted as result of different subsidence rate in the Dolomites-Carnia Basin. Trace elements analysis (EPMA) evidenced high Fe content in the dolomites precipitated at the IOB and SSB, and a general Sr depletion in both sections. At the IOB and SSB 6 Microfacies-types were defined, occurring similarly in both sections. The juxtaposition of carbonate and siliciclastic storm controlled lithofacies provides the opportunity for interpretation of their cyclic nature. The proposed 4th and 5th order units have been represented along the profiles. However, no correlation of 5th order cycles was possible. Partial paleomagnetic measures, carried out on 57 samples from 8 sites along the Fuina section, demonstrated the presence of natural remanent magnetization (NRM). Therefore, the Rio Fuina section could be considered suitable in future for further high-resolution magnetostratigraphic investigations. The Fuina section shows generally poor fossil records, and no evidence of conodonts were found so far on selected samples.

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