Milankovitch Periodicities Recorded in Cretaceous Deep-Sea Sequences from the Southern Alps (Northern Italy)

  1. P. L. de Boer2 and
  2. D. G. Smith3
  1. M. Claps and
  2. D. Masetti

Published Online: 29 APR 2009

DOI: 10.1002/9781444304039.ch9

Orbital Forcing and Cyclic Sequences

Orbital Forcing and Cyclic Sequences

How to Cite

Claps, M. and Masetti, D. (1994) Milankovitch Periodicities Recorded in Cretaceous Deep-Sea Sequences from the Southern Alps (Northern Italy), in Orbital Forcing and Cyclic Sequences (eds P. L. de Boer and D. G. Smith), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304039.ch9

Editor Information

  1. 2

    Utrecht, The Netherlands

  2. 3

    London, UK

Author Information

  1. Dipartimento di Scienze Geologiche e Paleontologiche dell' Università di Ferrara, Corso Ercole I d'Este 32, 44100 Ferrara, Italy

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 28 JAN 1994

ISBN Information

Print ISBN: 9780632037360

Online ISBN: 9781444304039

SEARCH

Keywords:

  • Milankovitch periodicities - Southern Alps;
  • Cismon valley section analysis;
  • Scaglia Rossa formations;
  • eccentricity cycle;
  • spectral peaks

Summary

Power spectral analysis has been applied for the first time to Cretaceous pelagic and hemi-pelagic sections in the Southern Alps (Venetian Prealps and Dolomites), to look for orbital–climatic (Milankovitch) forcing cycles. At the Castagnè section (middle Cenomanian), bed thickness, bedding plane position and codified lithological-class time series have been analysed to obtain spectra showing periodicities in the range of the orbital eccentricity, obliquity and precession cycles. At the Ra Stua section (Barremian), a bed thickness time series has been investigated which shows variable main peak values relative to all the three Milankovitch cycles; the ichnogenera presence/absence time series shows a dominant frequency corresponding to the short eccentricity cycle. In the Cismon Valley section (late Cenomanian), analysis of bed thickness and calcimetric time series show main spectral peaks with wavelength ratios similar to those existing between the short eccentricity, obliquity and precession cycles (100, 41 and 21 ka). This allows us to propose a sedimentation rate (about twice the value estimated by the existing time scale), calculated by matching the three most significant ranges of peaks to these three cycle time values.