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• W928244078 abstract "In the aftermath of the Triassic-Jurassic extinction event, extant slopes of drowned alpine reef buildups were recolonized in patches by predominantly non-rigid sponges. Sponge faunas of presumably similar associations are known from adjacent basins, but only by isolated spicules of completely collapsed specimens. Thus, just a few localities in the Northern Calcareous Alps display autochthonous communities of these rarely in situ-preserved species and provide an insight into their taphonomy. The study on hand deals with sponge taxonomy and taphonomy from sediments of 21 localities in the Northern Calcareous Alps, emphasizing the documentation of autochthonous spiculites from the two outcrops Adnet/Rot-Grau-Schnöll Quarry and Steinplatte/Plattenkogel hill .The lower slope of the drowned Alpine Adnet Reef was recolonized in Hettangian time by sponge communities of hexactinellid (hexactinosid and lyssacinosid) taxa and a few demosponges. Special taphonomic processes caused an excellent preservation of these sponges. The preservation allows to define several growth forms and to study original spicule configurations of the mainly non-rigid skeletons. In Adnet the sponges are embedded in biodetrital limestones of the Schnöll Formation. Orientation and distribution of the sponges reflect autochthonous faunas that have been mixed with dislocated individuals by local water currents. The predominance of erect sponge types indicates intermediate sedimentation rates and/or occasional high-energy events. Sponge types and community structures are comparable with those from middle Paleozic mud mounds. Several hiatuses, mostly characterized by ferromanganese crusts have been kept free of sponge settlement. Carbon stable isotopes of the sponge-rich sequence show a small negative δ13Ccarb excursion that covers the period from Lower Hettangian to Lower Sinemurian.In a depression of the former Triassic reef surface at Steinplatte (Austria) lyssacinosid sponges formed spicular mats during starved Liassic sedimentation. They settled on detrital soft- or firmgrounds that were successively dominated by spicules of their own death predecessors and infiltrated sediments. Skeletal remains and adjacent micrites were partly fixed by microbially induced carbonate precipitation due to the decay of sponge organic matter. The irregular compaction of the sediment as well as volume reduction during microbialite formation resulted in syndiagenetic stromatactis cavities. Subjacent to the spiculite allochthonous sediments fill up sinkholes and crevices of the rough Triassic relief. In order to define the Lower Liassic paleoenvironment, the sediments and associated ferromanganese crusts were analysed by x-ray fluorescence and icp-mass spectrometry. The distribution pattern of major and trace elements show usual contents of hydrogenous Fe/Mn-precipitates. In contrast, the results of rare earth element analyses revealed a negative cerium anomaly within the crusts and the spiculite at Steinplatte locality. In Lower Liassic Fe/Mn crusts of the Northern Calcareous Alps such an anomaly has been proved for the first time. Most likely it is related to higher precipitation rates caused by bacterial mats or possibly by a small influence of hydrothermal fluids. Carbon and oxygen stable isotopes of the same sequence show primary signals of a small negative δ13Ccarb excursion that extends from Hettangian to Lower Sinemurian time." @default.
• W928244078 created "2016-06-24" @default.
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• W928244078 date "2022-02-20" @default.
• W928244078 modified "2023-09-23" @default.
• W928244078 title "Porifera-microbialites of the Lower Liassic (Northern Calcareous Alps) - Re-settlement strategies on submarine mounds of dead Rhaetian reefs by ancestral benthic communities" @default.
• W928244078 doi "https://doi.org/10.53846/goediss-2385" @default.
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