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Paleoenvironmental reconstruction of the "Lo Hueco" fossil site (Upper Cretaceous, Cuenca, Spain); preliminary stable isotope analyses on crocodilians and dinosaurs

Laura Domingo, Fernando Barroso-Barcenilla and Oscar Cambra-Moo
Paleoenvironmental reconstruction of the "Lo Hueco" fossil site (Upper Cretaceous, Cuenca, Spain); preliminary stable isotope analyses on crocodilians and dinosaurs
Palaios (March 2013) 28 (3): 195-202

Abstract

Stable isotope analyses (delta (super 18) O (sub PO4) , delta (super 18) O (sub CO3) , and delta (super 13) C) are reported for the first time on crocodilian, theropod, and sauropod teeth from two stratigraphic levels (G1 and G2) from the late Campanian-early Maastrichtian "Lo Hueco" fossil site (Cuenca, Spain) in order to better understand paleoclimatic and paleoenvironmental conditions existing in the Iberian Peninsula during the Late Cretaceous. Diagenetic alteration was evaluated using three tests: (1) consistent differences in enamel and dentine delta (super 18) O (sub PO4) values, (2) crocodilian delta (super 18) O (sub PO4) values consistently lower than dinosaur delta (super 18) O (sub PO4) values in agreement with the proposed latitudinal distribution between ectotherms and endotherms, and (3) a Delta delta (super 18) O (sub CO3-PO4) value of 9.1 + or - 1.7 per mil for dinosaurs in accordance with the expected equilibrium fractionation between carbonate and phosphate in unaltered modern mammalian bioapatite. Calculated delta (super 18) O (sub H2O) values are slightly higher in crocodilians compared to dinosaurs since semiaquatic ectothermic taxa delta (super 18) O (sub H2O) represents local meteoric waters in a brief window of time when the conditions are favorable for apatite synthesis, whereas terrestrial endothermic taxa delta (super 18) O (sub H2O) records ingested water year-round. Mean air temperature calculated using crocodilian and dinosaur delta (super 18) O (sub H2O) values shows an increase between G1 and G2, which may be related to differences in the sedimentological setting and/or to a shift toward warmer conditions over time. Finally, the sauropod mean delta (super 13) C value (-11.1 + or - 0.2 per mil, VPDB) is in the predicted range for C (sub 3) vegetation.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 28
Serial Issue: 3
Title: Paleoenvironmental reconstruction of the "Lo Hueco" fossil site (Upper Cretaceous, Cuenca, Spain); preliminary stable isotope analyses on crocodilians and dinosaurs
Affiliation: University of California at Santa Cruz, Earth and Planetary Sciences Department, Santa Cruz, CA, United States
Pages: 195-202
Published: 201303
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 63
Accession Number: 2013-041391
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, sketch map
N39°57'00" - N39°57'00", W02°02'60" - W02°02'60"
Secondary Affiliation: Universidad de Alcala de Henares, ESP, SpainUniversidad Autonoma de Madrid, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201326
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