Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..59...11l&link_type=abstract
Earth and Planetary Science Letters, Volume 59, Issue 1, p. 11-17.
Physics
31
Scientific paper
Oxygen isotopic analyses of planktonic foraminifera from an anoxic basin (Orca Basin) in the northwestern Gulf of Mexico record a negative isotopic anomaly 3.6% from 16,500 to 11,600 years before present, indicative of a discharge phase of glacial meltwater from the ablating Laurentide ice sheet in northern North America. The isotopic anomaly represents two major meltwater discharges of magnitudes 2.0% and 2.6% and each discharge shows evidence of several smaller isotopic pulses of magnitudes ranging from 0.7 to 1.4% The intermittent of these isotopic shifts implies that the southern margin of the Laurentide ice sheet experienced several retreats and advances before finally decaying to a northern position when most of the subsequent meltwater flowed to the east 11,600 years ago. The oxygen isotope record of the Gulf of Mexico is in good agreement with the reconstructed history of the Laurentide ice sheet based on continental evidence.
Kennett James P.
Leventer Amy
Williams Douglas F.
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