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Taphonomy of Bivalve Mollusks in Oolitic Limestones from Teresina Formation (Paraná Basin, Middle Permian, Prudentópolis, PR)

Jacqueline Peixoto Neves ; Rosemarie Rohn ; Marcello Guimarães Simões

Geologia USP. Série científica, 2010-10, Vol.10 (3), p.19-36 [Periódico revisado por pares]

Universidade de São Paulo

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  • Título:
    Taphonomy of Bivalve Mollusks in Oolitic Limestones from Teresina Formation (Paraná Basin, Middle Permian, Prudentópolis, PR)
  • Autor: Jacqueline Peixoto Neves ; Rosemarie Rohn ; Marcello Guimarães Simões
  • Assuntos: Limestone ; Paraná Basin ; Permian ; Taphonomy ; Teresina Formation
  • É parte de: Geologia USP. Série científica, 2010-10, Vol.10 (3), p.19-36
  • Descrição: Herein, it is presented the first detailed taphonomic study on bivalve mollusk shells preserved in the oolitic limestonesof the Teresina Formation (probably Kungurian-Roadian, Lower-Middle Permian) in the eastern margin of the Paranábasin. The selected beds are located in two quarries (informally named PRU 1 and PRU 2) in Prudentópolis municipality(Center-South Paraná State), and positioned approximately in the middle of the formation and probably in the Pinzonellaillusa Zone. The PRU 1 limestone (~30 cm thick), which is partially silicified and intercalated with predominantly peliticrocks, is classified as a bivalve oolitic grainstone. The basal contact is erosive and the top shows symmetrical ripple marks,which are draped by shale with mud cracks. There are two fining-upwards successions characterized by dense to dispersedpacking of the shells, which are usually disarticulated, randomly oriented (many nested/stacked) and mixed with some Formapeliticintraclasts. Microhummocky cross-stratification occurs a little below the top of the bed. The PRU2 bed is classified as ooidbivalverudstone (~5 cm thick), where all shells are disarticulated and fragmented, showing dense packing. The bivalves probablyinhabited a muddy substrate and were mixed (as parautochtonous and allochthonous bioclasts) with ooids during high-energy stormevents, including posterior shell displacement as a result of bioturbation. Thus, the calcareous beds represent amalgamated proximaltempestites with a complex taphonomic history, strong temporal/spatial mixing of bioclasts and limited paleoecological resolution. They are a typical example of shell beds generated in a huge epeiric sea, which was not necessarily connected to the ocean and where very low depositional-slope gradient, very slow subsidence and minimum sediment accommodation space caused frequent sedimentreworking by storm related processes.
  • Editor: Universidade de São Paulo
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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