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Lookup NU author(s): Dr Richard Tyson, Dr Paul Farrimond
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Very similar high-resolution δ13C(carb) and δ13C(org) curves are reported for the early Aptian 'Livello Selli' (LS, oceanic anoxic subevent 1a) at two pelagic successions of the Alpine Tethys: 'Roter Sattel' (Swiss Prealpes), deposited along the northwest margin, and 'Cismon' (southern Alps of northern Italy), deposited along the southeast margin. The δ13C(carb) and δ13C(org) curves are both divided into eight segments, six of which occur within the early Aptian Globigerinelloides blowi foraminiferal zone, indicating significant subzonal resolution. Most of the LS coincides with a chemostratigraphically defined 'Selli event': a period of constant isotopic values (mean values of δ13C(carb) and δ13C(org) ~+2.6‰ and -25‰ respectively) lasting 500 kyr to 1 Myr, rather than of positive excursion as previously supposed. This uniformity may reflect an equilibrium between C(org) burial and increased recycling rates of 12C and nutrient-rich intermediate water resulting from the intensification of oceanic thermohaline circulation.
Author(s): Menegatti A, Weissert H, Brown R, Tyson RV, Farrimond P, Strasser A, Caron M
Publication type: Article
Publication status: Published
Journal: Paleoceanography
Year: 1998
Volume: 13
Issue: 5
Pages: 530-545
Print publication date: 01/01/1998
ISSN (print): 0883-8305
ISSN (electronic): 1944-9186
Publisher: American Geophysical Union
URL: http://dx.doi.org/10.1029/98PA01793
DOI: 10.1029/98PA01793
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