Middle to Late Jurassic equatorial seawater temperatures and latitudinal temperature gradients based on stable isotopes of brachiopods and oysters from Gebel Maghara, Egypt.

Alberti, Matthias, Fürsich, Franz T., Abdelhady, Ahmed A. and Andersen, Nils (2017) Middle to Late Jurassic equatorial seawater temperatures and latitudinal temperature gradients based on stable isotopes of brachiopods and oysters from Gebel Maghara, Egypt. Palaeogeography Palaeoclimatology Palaeoecology, 468 . pp. 301-313. DOI 10.1016/j.palaeo.2016.11.052.

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Abstract

Stable isotope (δ18O, δ13C) analyses of brachiopod and oyster shells from the Gebel Maghara, Egypt, were used to reconstruct the first detailed dataset on peri-equatorial water temperatures during the Middle to Late Jurassic. Throughout this time interval, temperatures remained relatively constant around an average of 25.7 °C. Slightly warmer conditions existed in the Early Bathonian (~ 27.0 °C), while the Kimmeridgian shows the lowest temperatures (~ 24.3 °C). As expected for a tropical palaeolatitude, the seasonality was very low (< 2 °C) as reconstructed by high-resolution stable isotope analyses of two oyster shells. Latitudinal temperature gradients in the Middle Jurassic were much steeper than previously expected and comparable to today. During the Kimmeridgian (Late Jurassic), temperatures in Europe were generally warmer leading to weaker latitudinal gradients. On average, water temperatures reconstructed from stable isotopes for Jurassic localities above the thermocline are lower than Recent sea-surface temperatures (based on currently used estimates for the δ18O value of seawater).

Document Type: Article
Keywords: Jurassic, Palaeoclimate, Stable isotope analyses, Seasonality, Latitudinal temperature gradient, Egypt
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.palaeo.2016.11.052
ISSN: 0031-0182
Projects: Future Ocean
Date Deposited: 23 Feb 2018 09:54
Last Modified: 12 Apr 2019 16:09
URI: http://oceanrep.geomar.de/id/eprint/41997

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