Testing the impact of diagenesis on the delta O-18 and delta C-13 of benthic foraminiferal calcite from a sediment burial depth transect in the equatorial Pacific

Kirsty M. Edgar*, Heiko Paelike, Paul A. Wilson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

39 Citations (Scopus)
277 Downloads (Pure)

Abstract

Stable oxygen and carbon isotope (O-18 and C-13) values measured in foraminiferal calcite are one of the primary tools used in paleoceanography. Diagenetic recrystallization of foraminiferal calcite can act to reset primary isotopic values, but its effects are typically poorly quantified. Here we test the impact of early stage diagenesis on stable isotope records generated from a suite of drill sites in the equatorial Pacific Ocean recovered during Ocean Drilling Program Leg 199 and Integrated Ocean Drilling Program Expedition 320. Our selected sites form paleowater and burial depth transects, with excellent stratigraphic control allowing us to confidently correlate our records. We observe large intersite differences in the preservation state of benthic foraminiferal calcite, implying very different recrystallization histories, but negligible intersite offsets in benthic O-18 and C-13 values. We infer that diagenetic alteration of benthic foraminiferal calcite (in sedimentary oozes) must predominantly occur at shallow burial depths (

Original languageEnglish
Pages (from-to)468-480
Number of pages13
JournalPaleoceanography
Volume28
Issue number3
Early online date5 Sep 2013
DOIs
Publication statusPublished - 11 Oct 2013

Keywords

  • oligocene
  • benthic foraminifera
  • diagenesis
  • recrystallisation
  • stable isotopes
  • Integrated Ocean Drilling Program
  • SEA-SURFACE TEMPERATURES
  • PLANKTONIC-FORAMINIFERA
  • ISOTOPIC COMPOSITION
  • INTERSTITIAL WATERS
  • MARINE CARBONATE
  • OCEAN
  • EOCENE
  • OXYGEN
  • CHEMISTRY
  • OLIGOCENE

Cite this