Location of Repository

Organic Carbon Burial following the Middle Eocene Climatic Optimum (MECO) in the central - western Tethys

By D.J.A. Spofforth, C. Agnini, H. Pälike, D. Rio, E. Fornaciari, L. Giusberti, V. Luciani, L. Lanci and G. Muttoni

Abstract

We present trace metal geochemistry and stable isotope records for the middle Eocene Alano di Piave section, NE Italy, deposited during magnetochron C18n in the marginal Tethys Ocean. We identify a $\sim$ 500 kyr long carbon isotope perturbation event we infer to be the middle Eocene Climatic Optimum (MECO) confirming the northern hemisphere expression and global occurrence of MECO. Interpreted peak climatic conditions are followed by the rapid deposition of two organic rich intervals ($\le$3\% TOC) and contemporaneous positive $\delta^{13}$C excursions. These two intervals are associated with increases in the concentration of sulphur and redox-sensitive trace metals, and low concentrations of Mn, as well as coupled with the occurrence of pyrite. Together these changes imply low, possibly dysoxic, bottom water O$_{2}$ conditions promoting increased organic carbon burial. We hypothesize that this rapid burial of organic carbon lowered global {\it p}CO$_{2}$ following the peak warming and returned the climate system to the general Eocene cooling trend

Topics: QE
Year: 2010
OAI identifier: oai:eprints.soton.ac.uk:69961
Provided by: e-Prints Soton

Suggested articles

Preview

Citations

  1. (1982). A revised magnetic polarity timescale for the cretaceous and Cainozoic, doi
  2. (2005). A revised tropical to subtropical paleogene planktonic foraminiferal zonation, doi
  3. (1979). Adria, the african promontory, in mesozoic mediterranean paleogeography,EarthScience Reviews, doi
  4. (1974). Alpine, Mediterranean and Central Atlantic Mesozoic Facies in relation to the early evolution of the Tethys, doi
  5. (1985). Cenozoic calcareous nannofossils, in Plankton Stratigraphy, doi
  6. (1976). Comparative thermal and alternating magnetic-field demagnetizations, in Transactions-American Geophysical Union,
  7. (2009). Coupled greenhouse warming and deep-sea acidification in the middle Eocene, doi
  8. (1971). Environmental influences on the chemical composition of shales and clays, doi
  9. (2006). From Middle Jurassic heating to Neogene cooling: The thermochronological evolution of the southern Alps, doi
  10. (1993). Geochemistry of Recent Oxic and Anoxic Marine-Sediments - Implications for the Geological Record, doi
  11. in press) 2010), Integrated Bio-magnetostratigaphy of the Alano di Piave section (NE Italy): A proposal and definition of the middle–late Eocene boundary,
  12. (2001). Integrated stratigraphy of the Kimmeridge Clay Formation (Upper Jurassic) based on exposures and boreholes in south Dorset, doi
  13. (1977). Late Cretaceous geomagnetic polarity sequence - detailed rock and paleomagnetic studies of Scaglia Rossa limestone at Gubbio, doi
  14. (1992). Paleomagnetic data from Umbria (Italy) - Implications for the rotation of Adria and Meozoic apparent polar wander paths., doi
  15. (2002). Pitfalls of normalization of marine geochemical data using a common divisor, doi
  16. (2007). Provenance and paleogeographic evolution in a multi-source foreland: The Cenozoic Venetian-Friulian Basin doi
  17. (1983). Quantitative biochronology of Pliocene and early Pleistocene calcareous nannofossils from the Atlantic, Indian and Pacific oceans., doi
  18. (1995). Revised Calibration of the Geomagnetic Polarity Timescale for the Late Cretaceous and Cenozoic, doi
  19. (1971). Standard Tertiary and Quaternary calcareous nannoplankton zonation, doi
  20. (1979). Stuijvernberg
  21. (1981). Subsidence and sedimentation on Jurassic passive continental-margin, doi
  22. (1980). The least-squares line and plane and the analysis of paleomagnetic data,Geophysical doi
  23. (2007). The middle Eocene climatic optimum event in the Contessa Highway section, Umbrian Apennines, Italy, doi
  24. (1990). u n doi
  25. Wade (2006a), The Heartbeat of the Oligocene Climate System, doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.