High-latitude application of sup 87 Sr/ sup 86 Sr: Correlation of Nuwok beds on North Slope, Alaska, to standard Oligocene chronostratigraphy
- Geological Survey of Canada, Calgery, Alberta (Canada)
- Columbia Univ., Palisades, NY (USA)
Strontium isotope ratios ({sup 87}Sr/{sup 86}Sr) calculated from three samples of benthic forminifers and one mallusc indicate an age range from 23.8 to 27.0 Ma for the Nuwok Member of the Sagavanirktok Formation, eastern North Slope, Alaska. Previous correlations derived paleontologically (foraminifers, ostracodes, and molluscs) for the Nuwok beds have differed greatly (Oligocene to Pliocene), but strontium isotope ratios substantiate the late Oligocene age determined from benthic foraminifers. The results constitute an important test case, illustrating the effectiveness of the strontium isotope method in correlating high-latitude carbonate samples to the standard Oligocene chronostratigraphy. In addition, a sample from the Kugmallit sequence in the Beaufort Sea Edlok N-56 well provided a strontium isotope age estimate of 30.7 Ma. The Edlok sample was paleontologically correlated to just below the early/late Oligocene boundary (30.0 Ma).
- OSTI ID:
- 6357532
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 18:5; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580000* -- Geosciences
AGE ESTIMATION
ALASKA
ALASKAN NORTH SLOPE
ALKALINE EARTH ISOTOPES
ANIMALS
AQUATIC ORGANISMS
BETA DECAY RADIOISOTOPES
CENOZOIC ERA
CORRELATIONS
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FEDERAL REGION X
FORAMINIFERA
FOSSILS
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGY
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INVERTEBRATES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
MICROORGANISMS
MOLLUSCS
NORTH AMERICA
NUCLEI
PALEONTOLOGY
PLIOCENE EPOCH
PROTOZOA
RADIOISOTOPES
SARCODINA
STABLE ISOTOPES
STRATIGRAPHY
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
TERTIARY PERIOD
USA