A Multidisciplinary Approach to Global Correlation and Geochronology. The Cretaceous Shallow-Water Carbonates of Southern Apennines, Italy
Published:January 01, 2004
Bruno D’Argenio, Vittoria Ferreri, Helmut Weissert, Sabrina Amodio, Francesco P. Buonocunto, Lukas Wissler, 2004. "A Multidisciplinary Approach to Global Correlation and Geochronology. The Cretaceous Shallow-Water Carbonates of Southern Apennines, Italy", Cyclostratigraphy: Approaches and Case Histories, Bruno D’Argenio, Alfred G. Fischer, Isabella Premoli Silva, Helmut Weissert, Vittoria Ferreri
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Detailed sedimentological and carbon-isotope data have allowed us to propose a high-resolution regional correlation between four Lower Cretaceous carbonate-platform successions, Early Aptian to Early Albian in age, cropping out in the southern Apennines. These successions, formed in open to restricted lagoonal and peritidal-supratidal settings, reveal a high-frequency cyclic recurrence of depositional and early meteoric (karstic and/or pedogenetic) features. The latter are normally superimposed on subtidal deposits, suggesting that the above cyclicity may be linked to sea-level changes. In the studied sections, elementary cycles are grouped into bundles, which in turn are grouped into superbundles. Although bundles and superbundles appear to be related to the Earth’s orbital short-eccentricity and long-eccentricity signal, respectively, elementary cycles seem to record either the precession or a combination of the precession and obliquity periodicity. Moreover, the stacking pattern of the orbitally controlled cycles suggests that they are superimposed on lower-frequency sea-level fluctuations (transgressive-regressive facies trends).
The δC curves, established throughout the sections, show the same carbon-isotope pattern as the time-equivalent pelagic strata (two positive carbon-isotope episodes separated by an interval with lower carbon-isotope values). On the basis of this correspondence, and integrating the cyclostratigraphy and the carbon-isotope stratigraphy with the sequence stratigraphy, we propose a high-precision regional correlation and a chronostratigraphic chart and suggest a duration of 7.8 My for the studied interval. Moreover, on the basis of sequence stratigraphy and isotope geochemical criteria, and using our orbital chronostratigraphy as a reference frame, a correlation with current global scales is here proposed.
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Cyclostratigraphy: Approaches and Case Histories
This volume is derived from an SEPM international workshop entitled Multidisciplinary Approach to Cyclostratigraphy, organized by the editors in May 2001 and held in Sorrento (Naples, Italy). In the Introduction we offer a brief history of how concepts of orbital cyclicity and its effects on the Earth evolved, an appraisal of the present state of research, and an overview of the papers in this volume. The main body of the volume consists of the contributed studies. These include a paper on conceptual and pragmatic approaches to stratification cycles by one of the pioneers of cyclostratigraphy, Walther Schwarzacher, who, in the 1940s, discovered the hierarchical expression of orbital cycles in rocks. The other contributions are specific studies of cyclic sequences, extending from the Quaternary back to the Triassic, covering the range from continental deposits to the deep sea, and employing a wide variety of techniques for extracting and processing the information.