Hostname: page-component-77c89778f8-fv566 Total loading time: 0 Render date: 2024-07-19T07:23:40.594Z Has data issue: false hasContentIssue false
  • English
  • Français

Anomalous High 14C Activity Found in Recent Corals from the Philippines∗

Published online by Cambridge University Press:  18 July 2016

Horst Willkomm
Horst Willkomm*
Affiliation:
14C Laboratory, Institut für Reine und Angewandte Kernphysik University of Kiel, 2300 Kiel 1, West Germany
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The carbonate skeletons of small living corals collected in Spring 1981 from Cebu Island, the Philippines, had 14C activities up to 147% of recent standard. Similarly high values were found in the carbonate structure of three large coral heads, where the 14C content of six penetrating cores was measured. In these corals the activity of the outer parts grown since 1960 reached values as high as 155% (corrected for δ13C = − 25‰) while the inner part grown from 1860 to 1950 had values of 106 to 110%. The 14C content of corals should be ca 116% due to the atomic bomb effect and 95% before 1955. The samples were taken from the shore, exposed to tidal waters, so that local contamination is improbable. Organic samples collected from the same region showed normal 14C activity.

Type
IV. Methods and Applications
Information
Radiocarbon , Volume 28 , Issue 2A , 1986 , pp. 486 - 494
Copyright
Copyright © The American Journal of Science 

References

Barker, D, Jull, A J T and Donahue, D J, in press, Excess C-14 abundances in uranium ores: possible evidence for emission from uranium-series isotopes: Geophys Research Letters.Google Scholar
Druffel, E M, 1980, Radiocarbon in annual coral rings of Belize and Florida, in Stuiver, M and Kra, R S, eds, Internatl 14C conf, 10th, Proc: Radiocarbon, v 22, no. 2, p 363–371.Google Scholar
Druffel, E M and Suess, H E, 1983, On the radiocarbon record in banded corals: Exchange parameters and net transport of 14CO2 between atmosphere and surface ocean: Tour Geophys Research, v 88, no. C2, p 1271–1280.CrossRefGoogle Scholar
Grobe, H, Wefer, G and Willkomm, H, in press, Internal structure of the double reef of North Bohol and the Olango Reef Flat (Philippines): Philippine Sci, v 21.Google Scholar
Linick, T W, 1980, Bomb-produced carbon-14 in the surface water of the Pacific Ocean, in Stuiver, M and Kra, R S, eds, Internatl 14C conf, 10th, Proc: Radiocarbon, v 22, no. 3, p 599–606.Google Scholar
Nozaki, Y, Rye, D M, Turekian, K K and Dodge, R E, 1978, A 200 year record of carbon-13 and carbon-14 variations in a bermuda coral: Geophys Research Letters, v 5, no. 10, p 825–828.CrossRefGoogle Scholar
Nydal, R, Lövseth, K and Skogseth, F H, 1980, Transfer of bomb 14C to the ocean surface, in Stuiver, M and Kra, R S, eds, Internatl 14C conf, 10th, Proc: Radiocarbon, v 22, no. 3, p 626–635.Google Scholar
Pätzold, J, 1984, Growth rhythms recorded in stable isotopes and density bands in the reef coral Porites lobata (Cebu, Philippines): Coral Reefs, v 3, p 87–90.CrossRefGoogle Scholar