NDLI: Middle Triassic radiolarite pebbles in the Middle Jurassic Hallstatt Mélange of the Eastern Alps: implications for Triassic–Jurassic geodynamic and paleogeographic reconstructions of the western Tethyan realm

Content Provider	Springer Nature Link
Author	Gawlick, Hans Jürgen Missoni, Sigrid
Copyright Year	2015
Abstract	The microfacies and biostratigraphy of radiolarite and limestone components in mass-flow deposits from the upper Middle to lower Upper Jurassic Hallstatt Mélange were analyzed. The radiolarite components are of Late Anisian to early Late Ladinian age, the various colored limestone components are Late Triassic Hallstatt pelagics. All components are interpreted as derived from the continental slope towards the Neotethys Ocean (Meliata facies zone). A comparison with preserved successions from the Carpathians, the Pannonian realm, and the Dinarides is presented to strengthen this interpretation. Reworked oceanic crust is missing in the mass-flow deposits. The reconstructed Middle–Upper Triassic sedimentary succession documents the existence of Triassic radiolarites also in the distal passive margin setting of the Eastern Alps. The occurrence of Middle Triassic radiolarites can therefore no longer be used to attribute tectonically isolated units in the whole Circum-Pannonian realm to indicate either Alpine–Carpathian or Dinaride–Hellenide provenance. In addition, the occurrence of Middle Triassic radiolarites in the Jurassic mélanges is no proof for the existence of an ocean (e.g., Meliata Ocean). Middle Triassic radiolarites are a common sedimentary feature in the distal passive margin setting of the Neotethys. In contrast, Upper Triassic radiolarites are missing in the passive margin setting and were exclusively deposited on the ocean floor.
Starting Page	1
Ending Page	19
Page Count	19
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	61
Issue Number	3
e-ISSN	16124820
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-05-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Northern Calcareous Alps Mélange Neotethys Ocean Triassic radiolarians Conodonts Paleogeography Sedimentology Biogeosciences Geochemistry Paleontology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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