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Volumn 280, Issue 5364, 1998, Pages 725-728

Deep-sea coral evidence for rapid change in ventilation of the deep North Atlantic 15,400 years ago

Author keywords

[No Author keywords available]

Indexed keywords

CADMIUM; CALCIUM; CARBON 14;

EID: 0032076643     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5364.725     Document Type: Article
Times cited : (204)

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    • Samples were cleaned of exterior organic carbon and coatings of manganese/iron oxides with successive leaches in a 50:50 mixture of 30% peroxide and 1 M NaOH. A final short leach in a 50:50 mixture of peroxide and 1% perchloric acid was used to remove all remaining organic stains. These precleaning steps removed 15 to 25% of the original coral weight. Immediately before final dissolution and graphitization, corals were soaked in 10% HCl to remove an additional 7 to 30% of aragonite. This procedure overcomes contamination problems from modern carbon that result from storage and handling and organic carbon from polyp and crust material. Samples were carefully chosen to avoid secondary calcification from endolithic activity.
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    • We thank S. Griffin, C. Masiello, and B. Grant for laboratory assistance. Discussions with D. Sigman, W. S. Broecker, and A. L. van Geen helped improve the manuscript. Supported by the National Science Foundation. J.F.A. was supported by a NASA Global Change fellowship and a grant from Tokyo Electric and Power Company.


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