scholarly journals Understanding the Effects of Dissolution on the Mg/Ca Paleothermometer in Planktic Foraminifera: Evidence From a Novel Individual Foraminifera Method

2017 ◽  
Vol 32 (12) ◽  
pp. 1386-1402 ◽  
Author(s):  
Brigitta L. Rongstad ◽  
Thomas M. Marchitto ◽  
Juan Carlos Herguera
Keyword(s):  
Planktic Foraminifera

MORPHOMETRIC AND STRATOPHENETIC STUDY OF THE ROTALIPORA LINEAGE (PLANKTIC FORAMINIFERA) DURING THE MIDDLE AND LATE CENOMANIAN

2016 ◽  
Author(s):  
Melanie Sorman ◽  
◽  
Andrew Jeffrey Fraass ◽  
Brian T. Huber ◽  
Beatrice Acha ◽  
...  
Keyword(s):  
Planktic Foraminifera

‘Bleaching’ of Photosymbionts in Planktic Foraminifera During the Middle Eocene Climatic Optimum

2014 ◽  
Vol 13 ◽  
pp. 141-141
Author(s):  
Kirsty M. Edgar ◽  
Stephen M. Bohaty ◽  
Samantha J. Gibbs ◽  
Philip F. Sexton ◽  
Richard D. Norris ◽  
...  
Keyword(s):  
Middle Eocene ◽  
Planktic Foraminifera ◽  
Climatic Optimum

scholarly journals Oceanographic parameters in continental margin of the State of Ceará (northeastern Brazil) deduced from C and O isotopes in foraminifers

2007 ◽  
Vol 79 (1) ◽  
pp. 129-139 ◽  
Author(s):  
Wanessa S. Marques ◽  
Eldemar de A. Menor ◽  
Alcides N. Sial ◽  
Valdir A.V. Manso ◽  
Satander S. Freire
Keyword(s):  
Continental Margin ◽  
Benthic Foraminifera ◽  
Linear Equations ◽  
The State ◽  
Northeastern Brazil ◽  
Oceanic Water ◽  
Ocean Water ◽  
Oxygen Utilization ◽  
Carbon And Oxygen Isotopes ◽  
Planktic Foraminifera

Specimens of Recent foraminifera of Amphistegina radiata, Peneroplis planatus and Globigerinoides ruber, from fifty samples of surface sediments of the continental margin of the State of Ceará, Brazil, have been analyzed for carbon and oxygen isotopes to investigate oceanographic parameters and determine the values of delta18O of the oceanic water. From a comparison between values of delta18O obtained for ocean water using the linear equations by (Craig and Gordon 1965) and the one by Wolff et al. (1998), it became evident that the former yielded a more reliable value (0.2‰ SMOW) than the latter. Lower values of delta18O for the ocean water in this continental margin resulted from continental water influence. Values of 18O (-0.3‰ to -1.5‰ PDB for benthic foraminifera and -0.6‰ to -2.4‰ PDB for planktic foraminifera), attest to a variation of temperatures of oceanic water masses, in average, between 20 to 22ºC in deep water and 24 to 27ºC, in surface water. Values of delta13C from +3.2‰ to -0.2‰ PDB (benthic foraminifera) reflect a variation in the apparent oxygen utilization (AOU) in the continental margin and indicate that the environments of bacteriological decomposition of organic matter are not continuous along the investigated area.

scholarly journals A record of Neogene seawater <i>δ</i><sup>11</sup>B reconstructed from paired <i>δ</i><sup>11</sup>B analyses on benthic and planktic foraminifera

2017 ◽  
Vol 13 (2) ◽  
pp. 149-170 ◽  
Author(s):  
Rosanna Greenop ◽  
Mathis P. Hain ◽  
Sindia M. Sosdian ◽  
Kevin I. C. Oliver ◽  
Philip Goodwin ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Middle Miocene ◽  
Isotope Composition ◽  
Boron Isotope ◽  
Mineral Formation ◽  
Secondary Mineral ◽  
Cycle Model ◽  
Planktic Foraminifera ◽  
Carbon Cycle Model ◽  
Secondary Mineral Formation

Abstract. The boron isotope composition (δ11B) of foraminiferal calcite reflects the pH and the boron isotope composition of the seawater the foraminifer grew in. For pH reconstructions, the δ11B of seawater must therefore be known, but information on this parameter is limited. Here we reconstruct Neogene seawater δ11B based on the δ11B difference between paired measurements of planktic and benthic foraminifera and an estimate of the coeval water column pH gradient from their δ13C values. Carbon cycle model simulations underscore that the ΔpH–Δδ13C relationship is relatively insensitive to ocean and carbon cycle changes, validating our approach. Our reconstructions suggest that δ11Bsw was  ∼  37.5 ‰ during the early and middle Miocene (roughly 23–12 Ma) and rapidly increased during the late Miocene (between 12 and 5 Ma) towards the modern value of 39.61 ‰. Strikingly, this pattern is similar to the evolution of the seawater isotope composition of Mg, Li and Ca, suggesting a common forcing mechanism. Based on the observed direction of change, we hypothesize that an increase in secondary mineral formation during continental weathering affected the isotope composition of riverine input to the ocean since 14 Ma.

Temperature sensitivity of planktic foraminifera and its influence on the oxygen isotope record

1998 ◽  
Vol 33 (3-4) ◽  
pp. 223-240 ◽  
Author(s):  
Stefan Mulitza ◽  
Tobias Wolff ◽  
Jürgen Pätzold ◽  
Walter Hale ◽  
Gerold Wefer
Keyword(s):  
Oxygen Isotope ◽  
Temperature Sensitivity ◽  
Planktic Foraminifera ◽  
Oxygen Isotope Record ◽  
Isotope Record
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