A climatic control on reorganization of ocean circulation during the mid-Cenomanian event and Cenomanian-Turonian oceanic anoxic event (OAE 2): Nd isotope evidence

Xin Yuan Zheng, Hugh C. Jenkyns, Andrew S. Gale, David J. Ward, Gideon M. Henderson

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17 Citations (Scopus)

Abstract

Although ocean circulation plays a vital role in the climate system, its response to major carbon-cycle perturbations during the mid-Cretaceous, including mid-Cenomanian event I (MCE I) and the Cenomanian-Turonian oceanic anoxic event (OAE 2), is poorly constrained. Here we present Nd isotope evidence for episodic increases in the influence of boreal seawater in the European epicontinental sea during MCE I. The start of this circulation reorganization lagged the onset of the d13C positive excursion defining MCE I. This sequence of change is similar to that observed during OAE 2 in the same area, showing a consistent response of regional circulation to changes in the global carbon cycle. Brief intervals of invasion of boreal fauna to mid-latitude seas, two during MCE I and one during OAE 2 (Plenus cold event), all started after the influence of boreal seawater was enhanced, implying a slower biological response to climate cooling rather than passive transport of fauna by boreal waters. The lack of an Nd isotope positive excursion in our record across MCE I supports a volcanic origin for prominent increases in seawater Nd isotope values found in the European epicontinental sea and the tropical Atlantic during OAE 2. The observed tight circulation-carbon cycle coupling may help the upper ocean replenish nutrients from deep waters and/or volcanic sources, providing a critical feedback allowing continuation of MCE I and OAE 2 over long durations.

Original languageEnglish (US)
Pages (from-to)151-154
Number of pages4
JournalGeology
Volume44
Issue number2
DOIs
StatePublished - Jan 1 2016
Externally publishedYes

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Turonian
isotope
carbon cycle
inland sea
seawater
fauna
climate
upper ocean
deep water
perturbation
ocean circulation
Cretaceous
cooling
nutrient
water

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A climatic control on reorganization of ocean circulation during the mid-Cenomanian event and Cenomanian-Turonian oceanic anoxic event (OAE 2) : Nd isotope evidence. / Zheng, Xin Yuan; Jenkyns, Hugh C.; Gale, Andrew S.; Ward, David J.; Henderson, Gideon M.

In: Geology, Vol. 44, No. 2, 01.01.2016, p. 151-154.

Research output: Contribution to journalArticle

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