Academic Commons

Articles

Planktic foraminifers as recorders of seawater Ba/Ca

Hoenisch, Baerbel; Allen, Katherine Ann; Russell, Ann D.; Eggins, Stephen M.; Bijma, Jelle; Spero, Howard J.; Lea, David W.; Yu, Jimin

Recent studies have used the Ba/Ca ratio of planktic foraminifer shells as a proxy for river run-off at oceanic sites near estuaries. Such studies assume that the Ba/Ca ratio in planktic foraminifer shells is primarily controlled by the Ba/Ca concentration of seawater and that other parameters such as salinity, temperature and pH do not compromise the primary Ba concentration relationship. Here we provide new insights from culture experiments and review published studies to confirm that environmental parameters including pH, temperature, salinity, and symbiont photosynthesis do not affect Ba substitution into planktic foraminiferal calcite. The partition coefficient for Ba in spinose planktic foraminifers is estimated as DBa = 0.15 ± 0.05 (95% confidence limits). The same factor also seems applicable to the non-spinose genus Neogloboquadrina but not to specimens of the non-spinose genus Globorotalia.

Files

  • thumnail for j.marmicro.2011.01.003.pdf j.marmicro.2011.01.003.pdf application/pdf 459 KB Download File

Also Published In

Title
Marine Micropaleontology
DOI
https://doi.org/10.1016/j.marmicro.2011.01.003

More About This Work

Academic Units
Lamont-Doherty Earth Observatory
Published Here
March 27, 2012
Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.