Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola

Christopher Strganac, Louis L. Jacobs, Michael J. Polcyn, Kurt M. Ferguson, Octávio Mateus, António Olímpio Gonçalves, Maria Luísa Morais, Tatiana da Silva Tavares

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

ABSTRACT Stable oxygen isotope values of inoceramid marine bivalve shells recovered from Bentiaba, Angola, are utilised as a proxy for paleotemperatures during the Late Cretaceous development of the African margin of the South Atlantic Ocean. The δ18O values derived from inoceramids show a long-term increase from –3.2‰ in the Late Turonian to values between –0.8 and –1.8‰ in the Late Campanian. Assuming a constant oceanic δ18O value, an ∼2‰ increase may reflect cooling of the shallow marine environment at Bentiaba by approximately 10°. Bentiaba values are offset by about +1‰ from published records for bathyal Inoceramus at Walvis Ridge. This offset in δ18O values suggests a temperature difference of ∼5° between coastal and deeper water offshore Angola. Cooler temperatures implied by the δ18O curve at Bentiaba coincide with the stratigraphic distribution of diverse marine amniotes, including mosasaurs, at Bentiaba.
Original languageEnglish
Pages (from-to)137-143
Number of pages7
JournalNetherlands Journal Of Geosciences-Geologie En Mijnbouw
Volume94
Issue number1
DOIs
Publication statusPublished - Mar 2015

Keywords

  • Cretaceous
  • inoceramid
  • oxygen
  • paleotemperature
  • South Atlantic Ocean

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