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Title

Isotopic fingerprints of Milankovitch cycles in Pennsylvanian carbonate platform-top deposits: the Valdorria record, Northern Spain

Authors
Merino-Tomé, Óscar
Fernández, Luis Pedro
Villa, Elisa
Published in Terra Nova. 2016, vol. 28, no. 5, p. 364-373
Abstract Sedimentary cyclic sequences deposited during the Late Palaeozoic Ice Age are widespread. Glacio-eustatic control of the cyclic patterns is commonly accepted, and the durations of the cyclothems generally match the short- and long-eccentricity Milankovitch orbital parameters. Nevertheless, geochemical fingerprints of orbital parameters are poorly documented in deep-time sedimentary records. Here, we report on well-exposed Bashkirian cyclothems of c. 123 ka and c. 400 ka durations from the Valdorria platform. The shorter-term cyclothems can be grouped into longer-term composite sequences that are consistent with generally accepted durations of c. 125 ka and c. 400 ka for Milankovitch eccentricity cycles. The stratigraphic pattern is mirrored by the isotope geochemical signals, which show distinct recurring trends. These trends are confirmed by statistical tests. Whereas intrinsic factors and/or subaerial exposure related to sea-level lowstands might have truncated cycle patterns in tectonically stable basins, rapid subsidence of the Valdorria platform’s foreland basin appears to have contributed to a faithful recording of cyclothems of different orders. The patterns and biostratigraphic constraint revealed in this study demonstrate the power of orbital forcing in imprinting sedimentary and geochemical signals in the rock record.
Keywords Milankovitch CyclesCarbonate PlatformsPennsylvanianCantabrian MountainsSpain
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Article (Published version) (19.8 MB) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://doi.wiley.com/10.1111/ter.12229
Structures
Research group Sedimentology, Biostratigraphy and Micropaleontology
Projects FNS: 200021_160019
Bourse A. Lombard, Bourse E. et L. Schmidheiny
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CHESNEL, Valentin et al. Isotopic fingerprints of Milankovitch cycles in Pennsylvanian carbonate platform-top deposits: the Valdorria record, Northern Spain. In: Terra Nova, 2016, vol. 28, n° 5, p. 364-373. https://archive-ouverte.unige.ch/unige:89856

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Deposited on : 2016-12-05

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