Arctic Ocean Paleocene Mollusc Stable Isotope DataEntry ID: NOAA_NCDC_PALEO_2006-069
Abstract: The data consist of oxygen and carbon isotope measurement of carbonate samples
microdrilled from sequential growth increments of 2 specimens of the bivalve
Camptochlamys alaskensis. The samples were collected by L. Marincovich, Jr.,
from the Prince Creek Formation at Ocean Point, North Slope, Alaska, Lat.
70.0833N, Long. 151.3667W. At the time of publication (1996), the age of the
samples was ... estimated to be Danian.
Late Paleocene high-latitude (80 deg N) Arctic Ocean shallow-marine
temperatures are estimated from molluscan d18O time series. Sampling of
individual growth increments of two specimens of the bivalve Camptochlamys
alaskensis provides a high-resolution record of shell stable isotope
composition. The heavy carbon isotopic values of the specimens support a late
Paleocene age for the youngest marine beds of the Prince Creek Formation
exposed near Ocean Point, Alaska. The oxygen isotopic composition of regional
freshwater runoff is estimated from the mean d18O value of two freshwater
bivalves collected from approximately coeval fluviatile beds. Over a 30 - 340
range of salinity, values assumed to represent the tolerance of C. alaskensis,
the mean annual shallow-marine temperature recorded by these individuals is
between 11 deg and 22 deg C. These values could represent maximum estimates of
the mean annual temperature because of a possible warm-month bias imposed on
the average d18O value by slowing or cessation of growth in winter months. The
amplitude of the molluscan d18O time series probably records most of the
seasonality in shallow-marine temperature. The annual temperature range
indicated is approximately 6 deg C, suggesting very moderate high-latitude
marine temperature seasonality during the late Paleocene. Based on analogy
with modern Chlamys species, C. alaskensis probably inhabited water depths of
30-50 meters. The seasonal temperature range derived from d18O is therefore
likely to be damped relative to the full range of annual sea-surface
temperatures. High-resolution sampling of molluscan shell material across
inferred growth bands represents an important proxy record of seasonality of
marine and freshwater conditions applicable at any latitude. If applied to
other regions and time periods, the approach used here would contribute
substantially to the paleoclimate record of seasonality.
Data Set Citation
Dataset Originator/Creator: Bice, K.L., M.A. Arthur, and L. Marincovich, Jr.
Dataset Title: Arctic Ocean Paleocene Mollusc Stable Isotope Data
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-069
Dataset Release Date: 7/2006
Dataset Release Place: Boulder,CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2006-069
Other Citation Details: NOAA/NCDC Paleoclimatology ProgramOnline Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/bic...
Paleo Temporal Coverage
Paleo Start Date: 65.5 ma
Paleo Stop Date: 61.7 ma
ISO Topic Category
Data Set Progress
Distribution Media: ftp
Distribution Format: text, excel
Bice, K.L., M.A. Arthur, and L. Marincovich, Jr.. 1996. Late Paleocene Arctic
Ocean shallow-marine temperatures from mollusc stable isotopes.
Paleoceanography, vol. 11, No. 3, pp. 241-249.
Creation and Review Dates
DIF Creation Date: 2006-10-24
Last DIF Revision Date: 2006-11-10