delta18O variations in the Halimeda of Virgin Islands sands: evidence of cool water in the northeast Caribbean, late Holocene

Journal of Sedimentary Research
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Abstract

Halimeda segments from carbonate sands on the Virgin Islands platform have delta 18 O versus PDB isotopic values ranging from -0.3% to -1.3% (x = -0.9%). Modern Halimeda segments from the same area have a measured delta18 O ranging from -2.0% to -2.5% PDB (x = -2.15%), and the carbonate skeleton appears to have formed in isotopic equilibrium with the oceanic waters on the platform. Biologic and geochemical data indicate that the sand deposits have accumulated under physical and chemical conditions similar to the modern shelf environment. 14 C data suggest that the sand was deposited over an approximate 5800-year span, centering about 4000 years B.P. The average isotopic difference of 1.25% between the Holocene and modern carbonate indicates that the late Holocene Halimeda lived in waters approximately 4 degrees cooler than the present.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title delta18O variations in the Halimeda of Virgin Islands sands: evidence of cool water in the northeast Caribbean, late Holocene
Series title Journal of Sedimentary Research
DOI 10.1306/212F81FC-2B24-11D7-8648000102C1865D
Volume 53
Issue 2
Year Published 1983
Language English
Publisher American Geological Institute
Contributing office(s) Coastal and Marine Geology Program
Description 10 p.
First page 429
Last page 438
Country United States
Other Geospatial Virgin Islands
Online Only (Y/N) N
Additional Online Files (Y/N) N
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