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Facies

, Volume 51, Issue 1–4, pp 522–540 | Cite as

Taphonomy of Early Permian benthic assemblages (Carnic Alps, Austria): carbonate dissolution versus biogenic carbonate precipitation

  • Diethard SandersEmail author
  • Karl Krainer
Original Article

Abstract

During the Early Permian, in the area of the Carnic Alps, a quartz-gravelly beach fringed a mixed siliciclastic-carbonate lagoon with fleshy algal meadows and oncoids; seaward, an ooid shoal belt graded down dip to a low-energy carbonate inner shelf with phylloid algal meadows. In limestones, foraminiferal biomurae and bioclast preservation record tapholoss by rotting of non-calcified organisms (interpreted as fleshy algae) and by dissolution of aragonitic fossils. Carbonate loss by dissolution was counteracted and, locally, perhaps exceeded by carbonate precipitation of encrusting foraminifera and as oncoids. Sites of abrasion and carbonate dissolution (beach), sites with tapholoss by rotting and dissolution, but with microbialite/foraminiferal carbonate precipitation (lagoon, inner shelf), and sites only of carbonate precipitation (ooid shoals) co-existed on discrete shelf compartments. Compartmentalized, contemporaneous carbonate dissolution and precipitation, to total amounts yet difficult to quantify, impede straightforward estimates of ancient carbonate sediment budget.

Keywords

Permian Southern Alps Taphonomy Carbonate budget Calcium carbonate dissolution 

Notes

Acknowledgements

Paul Wright, Cardiff, and Oliver Weidlich, London, are thanked for constructive reviews

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Faculty of Geo- and Atmospheric SciencesUniversity of InnsbruckInnsbruckAustria

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