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High-resolution δ13C stratigraphy through the early Aptian 'Livello Selli' of the Alpine Tethys

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.

Publication metadata

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


DOI: 10.1029/98PA01793


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