Onset of seawater87Sr/86Sr excursion prior to Cenomanian-Turonian Oceanic Anoxic Event 2? New late Cretaceous strontium isotope curve from the central Pacific Ocean

Atsushi Ando, Takanori Nakano, Kunio Kaiho, Toshinori Kobayashi, Emi Kokado, Boo Keun Khim

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A seawater Sr isotopic excursion toward lower values across the Cenomanian/Turonian boundary has been interpreted to indicate an episode of mantle plume volcanism that might have ultimately triggered Oceanic Anoxic Event (OAE) 2. However, the standard Sr isotope curve is not definitive enough to confirm the exact coincidence of the onset of the87Sr/86Sr excursion and the genesis of OAE 2, as revealed by the black shale deposition or positive δ13C excursion. New high-precision 87Sr/86Sr data from Upper Cretaceous chalks in a diagenetically well-constrained Pacific deep-sea section (Deep Sea Drilling Project Site 463), in conjunction with δ13C stratigraphy and revised planktonic foraminiferal zonation, show that the onset of the 87Sr/86Sr shift might have predated OAE 2, presumably by >0.6 m.y. Our results point to the possibility that the massive volcanism and associated Cenomanian-Turonian global change might have preconditioned the climatic and oceanic regimes for OAE 2, but not have actually triggered the event.

Original languageEnglish
Pages (from-to)322-334
Number of pages13
JournalJournal of Foraminiferal Research
Volume39
Issue number4
DOIs
Publication statusPublished - 2009 Oct 1

ASJC Scopus subject areas

  • Microbiology
  • Palaeontology

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