Seasonal climatic fluctuations in the Late Triassic tropics - high-resolution oxygen isotope records from aragonitic bivalve shells (Cassian Formation, Northern Italy)

Journal article
(Original article)


Publication Details

Author(s): Nuetzel A, Joachimski M, López Correa M
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology
Publisher: Elsevier
Publication year: 2010
Volume: 285
Pages range: 194-204
ISSN: 0031-0182
Language: English


Abstract


Three megalodontoid bivalves from the Upper Triassic Cassian Formation (N Italy, Dolomites) were sampled for δ13C and δ18O sclerochronology (n = 270). With more than 1000 described invertebrate species, the Cassian Formation has one of the best records of an Early Mesozoic tropical fauna. In addition, the Cassian Formation is one of the very few Triassic occurrences with original aragonite preservation, with all studied shells consisting of pristine aragonite. The presence of aragonite and crossed lamellar as well as fibrous prismatic shell microstructures shown for the first time for Triassic megalodontoids suggests absence or minimal impact of diagenetic alteration. The δ13C values range from 3.6 to 5.8‰ and show a distinct cyclicity in two studied shells whereas a third shell shows no obvious cyclicity. In one bivalve specimen, the cycles are somewhat offset from δ18O cycles and in the other specimen δ18O and δ13C curves are inversely correlated. Seasonal variation in freshwater runoff including nutrient input and subsequent changes in plankton productivity during dry and wet seasons may explain δ13C cyclicity. δ18O values show a pronounced cyclicity within each of the studied shells varying from - 3.6 to - 1.4‰. The variations in δ18O suggest a pronounced seasonality in Late Triassic tropical shallow waters of the western Tethys, with inferred seasonal temperature changes ranging from 24 to 32 °C. Influx of fresh water during the rainy seasons (mega-monsoon) or upwelling might also explain part of the variation in δ18O. The presented data suggest that the diverse Cassian fauna lived under conditions characterized by warm sea-surface waters with a pronounced seasonality. Similar conditions are reported for some modern tropical settings. © 2009 Elsevier B.V. All rights reserved.



FAU Authors / FAU Editors

Joachimski, Michael Prof. Dr.
Lehrstuhl für Geologie (Exogene Dynamik)
López Correa, Matthias
Lehrstuhl für Paläoumwelt


External institutions
Ludwig-Maximilians-Universität (LMU)


How to cite

APA:
Nuetzel, A., Joachimski, M., & López Correa, M. (2010). Seasonal climatic fluctuations in the Late Triassic tropics - high-resolution oxygen isotope records from aragonitic bivalve shells (Cassian Formation, Northern Italy). Palaeogeography, Palaeoclimatology, Palaeoecology, 285, 194-204. https://dx.doi.org/10.1016/j.palaeo.2009.11.011

MLA:
Nuetzel, A., Michael Joachimski, and Matthias López Correa. "Seasonal climatic fluctuations in the Late Triassic tropics - high-resolution oxygen isotope records from aragonitic bivalve shells (Cassian Formation, Northern Italy)." Palaeogeography, Palaeoclimatology, Palaeoecology 285 (2010): 194-204.

BibTeX: 

Last updated on 2018-09-08 at 15:08