Journal article

Third-order depositional sequences reflecting Milankovitch cyclicity

  • Strasser, André Geology and Paleontology Unit, Department of Geosciences, University of Fribourg, Switzerland
  • Hillgärtner, Heiko Geology and Paleontology Unit, Department of Geosciences, University of Fribourg, Switzerland
  • Hug, Wolfgang Geology and Paleontology Unit, Department of Geosciences, University of Fribourg, Switzerland
  • Pittet, Bernard Centre Sciences de la Terre, Université de Lyon I, Villeurbanne, France
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    19.01.2002
Published in:
  • Terra Nova. - 2000, vol. 12(6), no. 303
English The origin of third-order depositional sequences remains debatable, and in many cases it is not clear whether they were controlled by tectonic activity and/or by eustatic sea-level changes. In Oxfordian and Berriasian-Valanginian carbonate-dominated sections of Switzerland, France, Germany and Spain, high-resolution sequence-stratigraphic and cyclostratigraphic analyses show that the sedimentary record reflects Milankovitch cyclicity. Orbitally induced insolation changes translated into sea-level fluctuations, which in turn controlled accommodation changes. Beds and bedsets formed in rhythm with the precession and 100-kyr eccentricity cycles, whereas the 400-kyr eccentricity cycle contributed to the creation of major depositional sequences. Biostratigraphical data allow the correlation of many of the 400-kyr sequence boundaries with third-order sequence boundaries recognized in European basins. This implies that climatically controlled sea-level changes contributed to the formation of third-order sequences. Furthermore, this cyclostratigraphical approach improves the relative dating of stratigraphic intervals.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Geology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/299585
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