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Geology; September 2006; v. 34; no. 9; p. 773-776; DOI: 10.1130/G22685.1
© 2006 Geological Society of America
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Deep-water antipatharians: Proxies of environmental change

B. Williams*,1, M.J. Risk2, S.W. Ross*,3 and K.J. Sulak4

1 Centre de Recherché en Géochimie et en Géodynamique, Université du Québec à Montréal-McGill, CP 8888, Succursale Centre-Ville, Montreal, Quebec H3C 3P8, Canada
2 McMaster University, Department of Geography and Earth Sciences, 1280 Main Street West, Hamilton, Ontario L8S 4L8, Canada
3 Centre for Marine Science, University of North Carolina at Wilmington, 5600 Marvin Moss Lane, Wilmington, North Carolina 28409, USA
4 Center for Aquatic Resource Studies, U.S. Geological Survey, 7920 NW 71st Street, Gainesville, Florida 32653, USA

Deep-water (307–697 m) antipatharian (black coral) specimens were collected from the southeastern continental slope of the United States and the north-central Gulf of Mexico. The sclerochronology of the specimens indicates that skeletal growth takes place by formation of concentric coeval layers. We used 210Pb to estimate radial growth rate of two specimens, and to establish that they were several centuries old. Bands were delaminated in KOH and analyzed for carbon and nitrogen stable isotopes. Carbon values ranged from –16.4{per thousand} to –15.7{per thousand}; the oldest specimen displayed the largest range in values. Nitrogen values ranged from 7.7{per thousand} to 8.6{per thousand}. Two specimens from the same location and depth had similar 15N signatures, indicating good reproducibility between specimens.

Key Words: corals • nitrogen • carbon • stable isotopes • 210Pb dating






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