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Magnitude and profile of organic carbon isotope records from the Paleocene–Eocene Thermal Maximum: Evidence from northern Spain



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Manners, Hayley R. and Grimes, Stephen T. and Sutton, Paul A. and Domingo Martínez, Laura and Leng, Melanie J. and Twitchett, Richard J. and Hart, Malcolm B. and Jones, Tom Dunkley and Pancost, Richard D. and Duller, Robert and López Martínez, Nieves (2013) Magnitude and profile of organic carbon isotope records from the Paleocene–Eocene Thermal Maximum: Evidence from northern Spain. Earth and planetary science letters, 376 . pp. 220-230. ISSN 0012-821X

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Official URL: http://dx.doi.org/10.1016/j.epsl.2013.06.016


The Paleocene–Eocene Thermal Maximum (PETM), a hyperthermal event that occurred ca. 56 Ma, has been attributed to the release of substantial amounts of carbon, affecting the atmosphere, biosphere and the oceans. Current issues with respect to our understanding of the PETM include the amount of carbon released, the duration of carbon release, and the mechanism(s) of release, all of which are related to the magnitude and profile of the associated Carbon Isotope Excursion (CIE). High-resolution organic carbon profiles (δ13 C) of six PETM sections in northern Spain are presented that span a transect from continental to marine environments. These data represent the highest-resolution isotope records for these sections and allow a comparison of the magnitude of the excursion, the shape of the vertical δ13 C profile during the PETM episode, and the relative timing of the onset of the excursion across a linked sediment routing system. Previous studies using carbonate δ13 C data have suggested that the continental Claret Conglomerate, found in this region, formed synchronously with a marine clay-rich siliciclastic unit, with these key lithological changes interpreted to be driven by increased seasonal rainfall-runoff in the warmer PETM climate. Our data suggest that deposition of these units did not immediately follow the CIE onset, indicating that there may be a temporal lag between the onset of the PETM warming and the response of the depositional systems in northern Spain. No systematic variation in the magnitude of the CIE between different depositional environments was found; the marine CIE magnitudes are at the higher end of those previously described (3.7 ± 1.4‰), and the continental ranges are lower (3.1 ± 1.3‰).

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Received 5 April 2012 / Received in revised form 6 June 2013 / Accepted 11 June 2013 / Available online 5 July 2013
© 2013 Elsevier B.V. All rights reserved.

Uncontrolled Keywords:carbon isotopes; Paleocene–Eocene thermal maximum; CIE; Northern Spain
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Geochemistry
ID Code:70266
Deposited On:06 Apr 2022 06:14
Last Modified:06 Apr 2022 08:52

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