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

Alberti M, Fürsich F, Abdelhady AA, Andersen N (2017)

Publication Language: English

Publication Type: Journal article

Publication year: 2017

Journal

Palaeogeography, Palaeoclimatology, Palaeoecology Elsevier

Publisher: Elsevier B.V.

Book Volume: 468

Pages Range: 301-313

DOI: 10.1016/j.palaeo.2016.11.052

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).

Authors with CRIS profile

Franz Fürsich

Involved external institutions

Christian-Albrechts-Universität zu Kiel DE Germany (DE) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN)

How to cite

APA:

Alberti, M., Fürsich, F., Abdelhady, A.A., & Andersen, N. (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, 301-313. https://dx.doi.org/10.1016/j.palaeo.2016.11.052

MLA:

Alberti, Matthias, et al. "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 (2017): 301-313.

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