Crystallinity of foraminifera shells: A proxy to reconstruct past bottom water CO(3)(=) changes?
| Type | Article | ||||||||
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| Date | 2004-08-24 | ||||||||
| Language | English | ||||||||
| Author(s) | Bassinot Fc1, 2, Melieres F3, Gehlen M1, Levi C1, Labeyrie L1, 4 | ||||||||
| Affiliation(s) | 1 : IPSL, LSCE, Unite Mixte CEA CNRS, F-91190 Gif Sur Yvette, France. 2 : Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England. 3 : MNHN, Geol Lab, F-75005 Paris, France. 4 : Univ Versailles, Dept Phys, F-78000 Versailles, France. |
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| Source | Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2004-08-24 , Vol. 5 , N. 8 , P. 1-12 | ||||||||
| DOI | 10.1029/2003GC000668 | ||||||||
| WOS© Times Cited | 25 | ||||||||
| Keyword(s) | bottom water CO(3), calcite crystallinity, carbonate dissolution, foraminifers, paleoceanography, mineral physics : X ray, neutron, electron spectroscopy and diffraction | ||||||||
| Abstract | 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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