Skip to main content
Article thumbnail
Location of Repository

Instability in tropical Pacific sea surface temperatures during the Early Aptian

By M. Dumitrescu, S.C. Brassell, S. Schouten, E.C. Hopmans and J.S. Sinninghe Damsté


The Cretaceous has long been recognized as a time when greenhouse conditions were fueled by elevated atmospheric CO2 and accompanied by perturbations of the global carbon cycle described as oceanic anoxic events (OAEs). Yet, the magnitude and frequency of temperature change during this interval of warm and equable climate are poorly constrained. Here we present a ighresolution record of sea-surface temperatures (SSTs) reconstructed using the TEX86 paleothermometer for a sequence of early Aptian organic-rich sediments deposited during the first Cretaceous OAE (OAE1a) at Shatsky Rise in the tropical Pacific. SSTs range from ~30 to ~36 0C and include two prominent cooling episodes of ~4 0C. The cooler temperatures reflect significant temperature instability in the tropics likely triggered by changes in carbon cycling induced by enhanced burial of organic matter. SST instability recorded during the early Aptian in the Pacific is comparable to that\ud reported for the late Albian–early Cenomanian in the Atlantic, suggesting\ud that such climate perturbations may have recurred during the Cretaceous with concomitant consequences for biota and the\ud marine environment

Topics: Aardwetenschappen, TEX86 index, oceanic anoxic events, Cretaceous sediments, carbon isotopes
Year: 2006
OAI identifier:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.