Abstract
Rock magnetic properties can be useful determining paleonvironmental changes. A dramatic climate change as occurred in the PETM modified the environment and hence the magnetic properties recorded in the sediments. New paleomagnetic data from the marine record of the PETM in the Southern Pyrenean Zone shows the variation on the magnetic parameters in four different sections. The magnetic signal reveals a positive excursion of magnetic values starting before the onset of the marly interval of La Faja de las Flores Mb (beginning of the PETM record, Ilerdian) in the Carriata section with a maximum value in the marly interval. A similar magnetic signal is observed in Bujaruelo section (~10 km south of Carriata at PETM times) directly related to the marly interval of Faja de las Flores Mb. However more to the south, the PETM interval does not appear in the sedimentary record, therefore in the southern Gallisue section no magnetic excursion occurs, and in the southernmost studied Entremon section a magnetic positive excursion occurs in a thin marly interval unrelated to the PETM, and in two lower intervals of the column. All sections were subjected to later deformation during the pyrenean orogeny and the three northernmost are in the regional cleavage front where pressure-solution and remagnetizations have been described. A postfolding remagnetization component is found in the three northern sections.
Highlights
The Paleocene-Eocene Thermal Maximum (PETM) has drawn the attention of investigators on global change over the last decades as it represents a good ∼56 Ma ago analog to the present-day dramatic warming related to massive carbon release into the ocean-atmosphere system (Kennett and Stott, 1991; Dickens, 1999; Norris and Röhl, 1999; Bowen et al, 2006; McInerney and Wing, 2011)
The goal of this paper is to provide new classical paleomagnetic data from shallow platform marine sediments of the PETM interval in the Southern Pyrenees
The carbonatic rocks studied in the Carriata section start with the Paleocene rocks overlying the Maastrichtian (Upper Cretaceous), which consists of ∼70 m of dolostones, limestones, and dolomitic limestones with algae laminations and scarce fossil content, which are known as Salarons dolostones Fm (Van de Velde, 1967)
Summary
The Paleocene-Eocene Thermal Maximum (PETM) has drawn the attention of investigators on global change over the last decades as it represents a good ∼56 Ma ago analog to the present-day dramatic warming related to massive carbon release into the ocean-atmosphere system (Kennett and Stott, 1991; Dickens, 1999; Norris and Röhl, 1999; Bowen et al, 2006; McInerney and Wing, 2011). Unpublished data from stable isotopes in the Carriata section show the PETM excursion, for δ18O (Rosales et al, in prep.). Archaic mammals were replaced by modern groups (Clyde and Gingerich, 1998; Bowen et al, 2002; Gingerich, 2003; Wing et al, 2005; Secord et al, 2012) and the floras experienced important changes (Jaramillo et al, 2006)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
