delta18O variations in the Halimeda of Virgin Islands sands: evidence of cool water in the northeast Caribbean, late Holocene
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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.
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |