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GEOREF RECORD

delta (super 18) O variations in the Halimeda of Virgin Islands sands; evidence of cool water in the Northeast Caribbean, late Holocene

Charles W. Holmes
delta (super 18) O variations in the Halimeda of Virgin Islands sands; evidence of cool water in the Northeast Caribbean, late Holocene
Journal of Sedimentary Petrology (June 1983) 53 (2): 429-438

Abstract

Halimeda segments from carbonate sands on the Virgin Islands platform have delta (super 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 delta (super 18) 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. (super 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.--Modified journal abstract.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 53
Serial Issue: 2
Title: delta (super 18) O variations in the Halimeda of Virgin Islands sands; evidence of cool water in the Northeast Caribbean, late Holocene
Author(s): Holmes, Charles W.
Affiliation: U. S. Geol. Surv., Corpus Christi, TX, United States
Pages: 429-438
Published: 198306
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 41
Accession Number: 1983-051847
Categories: Isotope geochemistryOceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, 1 plate, sketch map
N18°15'00" - N18°25'00", W65°00'00" - W64°49'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1983
Program Name: USGSOPNon-USGS publications with USGS authors
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