Newsletters on Stratigraphy, Vol. 50/2 (2017), 187–203 Article
Published online February 2017; published in print April 2017
Contribution to the magnetostratigraphy
of the Carnian: new magneto-biostratigraphic
constraints from Pignola-2 and Dibona marine
sections, Italy
Matteo Maron
1,2
, Giovanni Muttoni
2
, Mark J. Dekkers
3
, Michele Mazza
2
,
Guido Roghi
4
, Anna Breda
1
, Wout Krijgsman
3
, and Manuel Rigo
1,4
With 8 figures, 1 plate and 1 table
Abstract. In an effort to improve the calibration of the Late Triassic time scale, two stratigraphic succes-
sions in Italy were investigated for magnetostratigraphy: the Pignola-2 (Southern Apennines) and the Dibona
(Dolomites) sections. These sections reveal a sequence of biostratigraphically calibrated (conodonts and
palynomorphs) magnetic polarity zones encompassing the Julian/Tuvalian boundary (Carnian). A total of
63 samples have been collected from the Pignola-2 section that helped defining 3 magnetozones. These data
are constrained by a published radiometric U/Pb age of 230.91 0.33 Ma from the Aglianico ash-bed (Furin
et al. 2006). From the Dibona section, 81 samples have been collected, revealing 2 magnetozones in the
Heiligkreuz Fm. (lower part of the succession) and 2 magnetozones in the Travenanzes Fm. (upper part). The
Dibona section provided only few high-quality paleomagnetic data in spite of the sampling effort, so we con-
sidered only the Pignola-2 section as suitable for the correlation with other Carnian sections from the litera-
ture, in order to define the magnetostratigraphy around the Julian/Tuvalian boundary in the Tethys realm. The
correlation between the Pignola-2 and the Newark Astrochronological Polarity Time Scale (APTS) provides
independent insights on the age of the base of the Newark basin APTS. We found that the U-Pb zircon-dated
Pignola-2 level, magnetostratigraphically projected on the Newark APTS, falls within Chrons E5–E4 at
around 231 Ma, in agreement with the (extrapolated) astrochronological ages of the Newark APTS.
Key words. Late Triassic, Carnian, magnetostratigraphy, geochronology
© 2017 Gebrüder Borntraeger, Stuttgart, Germany
DOI: 10.1127/nos/2017/0291
www.borntraeger-cramer.de
0078-0421/2017/0291 $ 4.25
Authors’ addresses:
1
Department of Geosciences, University of Padova, via G. Gradenigo 6, 35131 Padova, Italy. matteo.maron.1@studenti.
unipd.it, anna.breda@unipd.it, manuel.rigo@unipd.it
2
Department of Earth Sciences “Ardito Desio”, University of Milano, via L. Mangiagalli 34, 20133 Milano, Italy. giovanni.
muttoni1@unimi.it, michele.mazza@unimi.it, matteo.maron@unimi.it
3
Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584
CD Utrecht, The Netherlands. M.J.Dekkers@uu.nl, W.Krijgsman@uu.nl
4
Institute of Geosciences and Earth Resources – CNR, Via G.Gradenigo 6, 35131 Padova, Italy. guido.roghi@igg.cnr.it,
manuel.rigo@unipd.it
* Corresponding author: matteo.maron.1@studenti.unipd.it, matteo.maron@unimi.it
eschweizerbart_xxx