Raitzsch, Markus and Hoenisch, Baerbel (2013): Cenozoic boron isotope variations in benthic foraminifers

Leg/Site/Hole:
ODP 199
ODP 199 1218
Identifier:
2013-035340
georefid
10.1130/G34031.1
doi
Creator:
Raitzsch, Markus
Columbia University, Department of Earth and Environmental Sciences, Palisades, NY, United States
author
Hoenisch, Baerbel
author
Identification:
Cenozoic boron isotope variations in benthic foraminifers
2013
Geology (Boulder)
Geological Society of America (GSA), Boulder, CO, United States
41
5
591-594
The boron isotopic composition of seawater (delta (super 11) B (sub sw) ) is a prerequisite for reliably estimating past variation of seawater pH from boron isotopes in marine carbonates (delta (super 11) B (sub c) ). Here we compose a 50 m.y. stack of delta (super 11) B (sub c) from Atlantic and Pacific Ocean deep-sea sediments, and discuss the potential effects of deep-sea pH and delta (super 11) B (sub sw) on our record. Using model-based Cenozoic pH values, the inferred delta (super 11) B (sub sw) values suggest an approximately 3 per mil increase since the Late Eocene, superimposed on oscillating variations with amplitudes of up to 2 per mil. Our estimates match existing reconstructions of delta (super 11) B (sub sw) , but call into question published fluid delta (super 11) B in halite as a recorder of delta (super 11) B (sub sw) .
English
Serial
Coverage:Geographic coordinates:
North:8.5300
West:-135.2200East: -135.2200
South:8.5300
Isotope geochemistry; Stratigraphy; Atlantic Ocean; B-11/B-10; benthic taxa; boron; carbonates; Cenozoic; chemostratigraphy; deep-sea environment; East Pacific; Eocene; Equatorial Pacific; Foraminifera; geochemistry; Invertebrata; isotopes; Leg 199; marine environment; microfossils; North Pacific; Northeast Pacific; Ocean Drilling Program; ODP Site 1218; Pacific Ocean; paleoclimatology; Paleogene; pH; Protista; sea water; stable isotopes; Tertiary;
.