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Cyclostratigraphy and the Milankovitch Theory

Out of Print

Series: Developments in Sedimentology Volume: 52

By: W Schwarzacher


Hardback | Dec 1993 | #35611 | ISBN: 0444896236
Out of Print Details

About this book

Cyclostratigraphy is concerned primarily with measuring geological time, and the time units used in this approach are sedimentary cycles. Milankovitch cycles mark time intervals of tens of thousands to several millions of years. Several examples from the Carboniferous to the Cretaceous are given to show how cyclostratigraphy can be applied to current geological problems.


1. Introduction. Some of Vail's cycle orders overlap the Milankovitch cycles. Definition of cycles. The quantitative description of cycles. The complexity of cycles. The regularity of cycles. The origin of cycles. Conclusions. 2. Oscillating Systems. Linear systems. Non-linear systems. Stochastically driven oscillators. Examples of oscillating,- systems. Climatic oscillators: the Ghil oscillator. The Saltzman oscillator. Geological 'oscillators. Concluding- remarks. 3. The Milankovitch Theory. The planetary system. The precession. The frequency stability of the orbital elements. The insolation. Milankovitch cycles and climate. The Pleistocene climate. 4. Methods of Analysis. Stratigraphical sections as stochastic processes. The spectral analysis. The estimation of spectra. Cospectral analysis. Power spectra in stratigraphical analysis. The Walsh spectra. The Walsh spectrum in stratigraphy. The role of spectral analysis in cyclostratigraphy. The effects- of sections. The effects of non-stationarity. Complex demodulation. Conclusions. 5. The Relation between Time and Sediment Accumulation. The random walk model. The rate of sedimentation. The completeness of the record. Cycles with precise time periods Cycles with changing lithology. The effect of random variations on a periodic signal Bioturbation. Methods of finding a z,t mapping function. 6. Stratification and Stratification Cycles. Marl-limestone sedimentation. Stratification patterns. Stratification cycles. The numerical description of bedded sequences. Stratigraphic trends. The recognition of stratification cycle boundaries. 7. Examples from the Carboniferous. The Lower Carboniferous. The Carboniferous limestones of north-west Ireland. The Benbulbin shale and Glencar limestone. The Dartry, limestone. The cyclostratigraphic interpretation of the Silo sequence- The cyclicity of York-shire ,and North Wales. The Pennsylvanian (Upper Carboniferous) cycles. 8. Triassic: Carbonate Platforms. The Northern Calcareous Alps. The cyclicity of the Dachstein limestone. Quantative studies. The Trans-Danubain Central range. The Dolomites. Absolute time estimates. The similarity of cycles. Subsidence. Sea level fluctuations. The geometry of cylcle formation. The platform-basin interaction. Concluding remarks. 9. Some Jurassic Examples. The lower Jurassic in Bnitain. The Kimmeridge day. The German Upper Jurassic. Examples from Tethyan regions. 10. Examples from the Cretaceous. The Umbria and Marche region of Itlay. The Maiolica. The Scisti a Fucoidi. The Scaglia Bianca. The western Tethis and the Atlantic. - The epicontinental seas. The Cretaceous-Tertiary boundary. Concluding remarks. 11. Non-Carbonate Cycles. The Permian evaporites. Lacustrine environments: the Lokatong,, and Passaic formations. The Green River Formation. Shallow marine environments. Fluviatile environments. Prodelta turbidites. 12. Clostratigraphy and Milankovitch Cycles. Practical cyctostratigraphy The

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