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Distinct responses of planktonic foraminiferal B/Ca to dissolution on seafloor

Dai, Yuhao LU ; Yu, Jimin and Johnstone, Heather J.H. (2016) In Geochemistry, Geophysics, Geosystems 17(4). p.1339-1348
Abstract

We have measured B/Ca in four core-top planktonic foraminiferal species (Globigerinoides ruber (white), Globigerinoides sacculifer (without final sac-like chamber), Neogloboquadrina dutertrei, and Pulleniatina obliquiloculata) from three depth transects (the Caribbean Sea, the southwestern Indian Ocean, and the Ontong Java Plateau) to evaluate the effect of dissolution on planktonic foraminiferal B/Ca. At each transect, G. ruber (w) and G. sacculifer (w/o sac) show decreasing B/Ca with increasing water depth. This decrease in B/Ca is accompanied with decreases in shell weights, Mg/Ca, and bottom water calcite saturation state. This indicates a postdepositional dissolution effect on B/Ca in these two species. The strong correlation... (More)

We have measured B/Ca in four core-top planktonic foraminiferal species (Globigerinoides ruber (white), Globigerinoides sacculifer (without final sac-like chamber), Neogloboquadrina dutertrei, and Pulleniatina obliquiloculata) from three depth transects (the Caribbean Sea, the southwestern Indian Ocean, and the Ontong Java Plateau) to evaluate the effect of dissolution on planktonic foraminiferal B/Ca. At each transect, G. ruber (w) and G. sacculifer (w/o sac) show decreasing B/Ca with increasing water depth. This decrease in B/Ca is accompanied with decreases in shell weights, Mg/Ca, and bottom water calcite saturation state. This indicates a postdepositional dissolution effect on B/Ca in these two species. The strong correlation observed between changes in B/Ca and bottom water calcite saturation state offers an approach to correcting for the dissolution bias. By contrast, B/Ca in N. dutertrei and P. obliquiloculata remains unchanged along depth transects, although shell weights and Mg/Ca display significant declines. Overall, our core-top results suggest species-specific dissolution effects on B/Ca in different planktonic foraminiferal species.

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type
Contribution to journal
publication status
published
subject
in
Geochemistry, Geophysics, Geosystems
volume
17
issue
4
pages
10 pages
publisher
American Geophysical Union (AGU)
external identifiers
  • scopus:84963623642
ISSN
1525-2027
DOI
10.1002/2015GC006199
language
English
LU publication?
no
id
e6f4b316-6cdc-4e84-96e7-09b4430f8ec5
date added to LUP
2019-10-29 10:52:04
date last changed
2022-04-18 18:56:23
@article{e6f4b316-6cdc-4e84-96e7-09b4430f8ec5,
  abstract     = {{<p>We have measured B/Ca in four core-top planktonic foraminiferal species (Globigerinoides ruber (white), Globigerinoides sacculifer (without final sac-like chamber), Neogloboquadrina dutertrei, and Pulleniatina obliquiloculata) from three depth transects (the Caribbean Sea, the southwestern Indian Ocean, and the Ontong Java Plateau) to evaluate the effect of dissolution on planktonic foraminiferal B/Ca. At each transect, G. ruber (w) and G. sacculifer (w/o sac) show decreasing B/Ca with increasing water depth. This decrease in B/Ca is accompanied with decreases in shell weights, Mg/Ca, and bottom water calcite saturation state. This indicates a postdepositional dissolution effect on B/Ca in these two species. The strong correlation observed between changes in B/Ca and bottom water calcite saturation state offers an approach to correcting for the dissolution bias. By contrast, B/Ca in N. dutertrei and P. obliquiloculata remains unchanged along depth transects, although shell weights and Mg/Ca display significant declines. Overall, our core-top results suggest species-specific dissolution effects on B/Ca in different planktonic foraminiferal species.</p>}},
  author       = {{Dai, Yuhao and Yu, Jimin and Johnstone, Heather J.H.}},
  issn         = {{1525-2027}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{4}},
  pages        = {{1339--1348}},
  publisher    = {{American Geophysical Union (AGU)}},
  series       = {{Geochemistry, Geophysics, Geosystems}},
  title        = {{Distinct responses of planktonic foraminiferal B/Ca to dissolution on seafloor}},
  url          = {{http://dx.doi.org/10.1002/2015GC006199}},
  doi          = {{10.1002/2015GC006199}},
  volume       = {{17}},
  year         = {{2016}},
}