Abstract
The oxygen and carbon composition of calcite has been determined for belemnites, ammonite aptychi and the matrix surrounding these fossils, from the Kimmeridgian-Tithonian of Mallorca. Petrography, cathodoluminescence and trace element analyses indicate that both ammonite aptychi and matrix has been diagenetically altered whereas the belemnites have been undergone minimal or no modification. The belemnites give the heaviest oxygen isotope values of +0.04 to −0.99% PDB and lighter values of −0.71 to −3.98% PDB come from the ammonite aptychi and matrix. The carbon isotopic compositions obtained from all the fossils are positive and are similar to those derived from modern marine shallow-water skeletons. Palaeotemperatures calculated on the basis of the oxygen isotopic composition of the belemnites give a range of values from 13.6° to 16°C. These results agree with Late Jurassic palaeotemperatures from similar palaeolatitudes.
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