The Middle to Upper Jurassic stable isotope record of Madagascar: Linking temperature changes with plate tectonics during the break-up of Gondwana

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Alberti M, Arabas A, Fürsich F, Andersen N, Ziółkowski P
Zeitschrift: Gondwana Research
Jahr der Veröffentlichung: 2019
Band: 73
Seitenbereich: 1-15
ISSN: 1342-937X


Abstract


Stable isotope (δ
18
O, δ
13
C) analyses were performed on well preserved belemnites, oysters, and rhynchonellid brachiopods from the Middle to Upper Jurassic of the Morondava Basin in southern Madagascar. Both brachiopods and oysters indicate similar average temperatures of 18.7 to 19.3 °C in the Early Callovian, followed by a temperature decrease towards the Middle Oxfordian (13.9 °C) and a minimum in the Early Kimmeridgian (12.3 °C). In contrast, belemnites from the Oxfordian show lower average temperatures of 10.0 °C, which is likely caused by specific conditions for these organisms (e.g., different fractionation or life habits). Additionally, three oysters from the Upper Oxfordian and Lower Kimmeridgian were used for high-resolution stable isotope analyses. The data show seasonal fluctuations of >6 °C around averages between 14.4 and 14.7 °C. Latitudinal temperature gradients for the Callovian and Kimmeridgian are similar to today at the examined low latitudes of the southern hemisphere. The observed cooling of around 5 °C from the Callovian to the Oxfordian/Kimmeridgian can be attributed to a concurrent southward drift of Madagascar during the break-up of Gondwana. Thus, the study underlines the importance of considering palaeogeography in interpreting stable isotope data as well as the potential of detecting and timing palaeogeographic events by using stable isotope analyses.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Fürsich, Franz Prof. Dr.
Lehrstuhl für Paläontologie


Einrichtungen weiterer Autorinnen und Autoren

Christian-Albrechts-Universität zu Kiel
Institute of Geological Sciences, Polish Academy of Sciences
University of Warsaw / Uniwersytet Warszawski


Zitierweisen

APA:
Alberti, M., Arabas, A., Fürsich, F., Andersen, N., & Ziółkowski, P. (2019). The Middle to Upper Jurassic stable isotope record of Madagascar: Linking temperature changes with plate tectonics during the break-up of Gondwana. Gondwana Research, 73, 1-15. https://dx.doi.org/10.1016/j.gr.2019.03.012

MLA:
Alberti, Matthias, et al. "The Middle to Upper Jurassic stable isotope record of Madagascar: Linking temperature changes with plate tectonics during the break-up of Gondwana." Gondwana Research 73 (2019): 1-15.

BibTeX: 

Zuletzt aktualisiert 2019-24-05 um 05:08