Crystallinity of foraminifera shells: A proxy to reconstruct past bottom water CO(3)(=) changes?

The reconstruction of past changes in bottom water CO(3)(=) is central to evaluating competing oceanic scenarios that deal with long-term variations in atmospheric pCO(2). In search of a quantitative bottom water CO(3)(=) proxy, we analyzed the variations of calcite crystallinity of planktonic foram...

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Bibliographic Details
Published in:Geochemistry, Geophysics, Geosystems
Main Authors: Bassinot, Fc, Melieres, F, Gehlen, M, Levi, C, Labeyrie, L
Format: Text
Language:English
Published: Amer Geophysical Union 2004
Subjects:
envir
geo
Jaya
Pacific
Planktonic foraminifera
Online Access:https://doi.org/10.1029/2003GC000668
https://archimer.ifremer.fr/doc/00226/33716/32138.pdf
https://archimer.ifremer.fr/doc/00226/33716/
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Summary:The reconstruction of past changes in bottom water CO(3)(=) is central to evaluating competing oceanic scenarios that deal with long-term variations in atmospheric pCO(2). In search of a quantitative bottom water CO(3)(=) proxy, we analyzed the variations of calcite crystallinity of planktonic foraminifera Globigerinoides ruber shells picked from core top samples along three depth transects: Ontong Java Plateau and the northeast margin of Irian Jaya, in the western equatorial Pacific, and the Sierra Leone Rise, in the eastern tropical Atlantic. The strong empirical relationship between calcite crystallinity ( inferred from the full width at half maximum (FWHM) of calcite (104) X-ray diffraction peak) and bottom water saturation relative to calcite (DeltaCO(3)) shows that foraminifera calcite crystallinity could be a promising proxy for the reconstruction of upper Pleistocene bottom water carbonate ion concentration.

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