Strontium isotope stratigraphy of Turonian-Campanian Gosau-type rudist formations in the Northern Calcareous and Central Alps (Austria and Germany)

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Abstract

Shells of hippuritid rudist bivalves from 16 localities of Upper Cretaceous rudist formations in Gosau-type sedimentary basins of the Eastern Alps (Northern Calcareous Alps and Austroalpine Units) have been analysed for 87Sr/86Sr values. The extent of diagenetic alteration of original isotopic compositions was assessed by analyses of concentrations of Sr, Mg, Fe and Mn, and proved to be minor in the samples investigated. A comparison of 87Sr/86Sr values of rudist shells with previously published variations of 87Sr/86Sr in Late Cretaceous sea water allows correlation with biostratigraphical standard zonations. Considerable stratigraphic revisions are the result for localities where previous biostratigraphical evidence was scarce or imprecise, while existing stratigraphical concepts are confirmed for many other localities where such evidence exists. A Late Turonian to earliest Coniacian age of several shells of Vaccinites inaequicostatus at localities in the environs of Lake St. Wolfgang is confirmed by similar isotopic ratios of shells of the same species in Greece and northern Italy. Previous identifications of hippuritids at the localities studied are discussed, and four characteristic associations are identified.

Original languageBritish English
Pages (from-to)429-441
Number of pages13
JournalCretaceous Research
Volume22
Issue number4
DOIs
StatePublished - 2001

Keywords

  • Austria
  • Germany
  • Gosau
  • Hippuritidae
  • Northern Calcareous Alps
  • Rudist bivalves
  • Strontium isotope stratigraphy
  • Upper Cretaceous

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