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Stable Isotope Compositions of a Late Jurassic Ammonite Shell: a Record of Seasonal Surface Water Temperatures in the Southern Hemisphere? : Volume 1, Issue 1 (21/08/2006)

By Lécuyer, C.

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Book Id: WPLBN0004007102
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Stable Isotope Compositions of a Late Jurassic Ammonite Shell: a Record of Seasonal Surface Water Temperatures in the Southern Hemisphere? : Volume 1, Issue 1 (21/08/2006)  
Author: Lécuyer, C.
Volume: Vol. 1, Issue 1
Language: English
Subject: Science, Eearth
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description: Laboratory Paléoenvironnements & Paléobiosphère, UMR CNRS 5125 , Bâtiment Geode, Université Claude Bernard Lyon I et Institut Universitaire de France, 27–43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France. Exceptional preservation of aragonite secreted by ammonites offers an opportunity to determine the seasonal temperature variations of Mesozoic surface waters. Ontogenetic profiles of carbon and oxygen isotope compositions have been obtained from the nacreous layer of a well-preserved Late Jurassic (Oxfordian) ammonite (Perisphinctes) from Madagascar. A similar range of oxygen isotope compositions was also obtained from an associated benthic bivalve (Astarte) which suggests the absence of sampling bias. Late Jurassic seasonal variations in the southern hemisphere were close to 2.5°C and relatively weak when compared to the 2.5–6.5°C temperature range prevailing in the present-day Indian Ocean at a paleolatitude of 40±1° S. According to the hypothesis of an ice cap-free Late Jurassic Earth, average sea surface temperatures may have been up to 7°C higher than now.

Stable isotope compositions of a late Jurassic ammonite shell: a record of seasonal surface water temperatures in the southern hemisphere?

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