Organic carbon burial following the middle Eocene climatic optimum in the central western Tethys

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doi: 10.1029/2009PA001738
Author(s): Spofforth, D. J. A.; Agnini, C.; Palike, Heiko; Rio, D.; Fornaciari, E.; Giusberti, L.; Luciani, V.; Lanci, L.; Muttoni, G.
Author Affiliation(s): Primary:
University of Southampton, School of Ocean and Earth Science, Southampton, United Kingdom
Other:
University of Padua, Italy
University of Ferrara, Italy
University of Urbino, Italy
University of Milan, Italy
Volume Title: Paleoceanography
Source: Paleoceanography, 25(3). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 76 refs.; illus., incl. 1 table, geol. sketch map
Summary: 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 ∼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 (≤3% TOC) and contemporaneous positive δ13C 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 O2 conditions promoting increased organic carbon burial. We hypothesize that this rapid burial of organic carbon lowered global pCO2 following the peak warming and returned the climate system to the general Eocene cooling trend.
Year of Publication: 2010
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Alano di Piave Italy; Algae; Belluno Italy; Biostratigraphy; Biozones; Burial; C-13/C-12; Calcium carbonate; Carbon; Cenozoic; Chemostratigraphy; Depositional environment; Eocene; Europe; Foraminifera; Global change; Invertebrata; Isotope ratios; Isotopes; Italy; Lithostratigraphy; Magnetostratigraphy; Marine environment; Microfossils; Middle Eocene; Nannofossils; Northeastern Italy; O-18/O-16; Organic compounds; Oxygen; Paleoclimatology; Paleoenvironment; Paleogene; Plantae; Protista; Sedimentary rocks; Southern Europe; Stable isotopes; Tertiary; Tethys; Total organic carbon; Veneto Italy
Coordinates: N455450 N455450 E0115455 E0115455
Record ID: 2013034368
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