Reworked Calcareous Nannofossils in the Gulf of MexicoEntry ID: NOAA_NCDC_PALEO_2001-005
Abstract: The history of meltwater flow from the Laurentide Ice Sheet to the Gulf of
Mexico during the last deglaciation, which holds possible implications for the
cause of the Younger Dryas cold episode, is not well understood. We propose a
new chronology based on using the percentage of reworked calcareous
nannofossils in Orca Basin sediments as a proxy for erosion. The period of
greatest meltwater ... flow to the gulf was between 12.7 and 12.1 ka (during the
Bølling warm interval), and flow remained high until the beginning of the
Younger Dryas cold episode at 11.3 ka; this corresponds to meltwater pulse IA.
A sharp meltwater decrease at 12.2 ka may represent the Older Dryas glacial
readvance. Little or no meltwater is inferred to have flowed to the gulf from
~10 to 9 ka, which is the time of the second major meltwater pulse, IB.
Therefore, meltwater must have been permanently diverted away from the Gulf of
Mexico at the beginning of the Younger Dryas.
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Marchitto, T.M., and Wei, K.-Y.
Dataset Title: Reworked Calcareous Nannofossils in the Gulf of Mexico
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2001-005
Dataset Release Date: 1/2001
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2001-005
Other Citation Details: NOAA/NCDC Paleoclimatology ProgramOnline Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/mar...
Paleo Temporal Coverage
Paleo Start Date: 18 ka
Paleo Stop Date: 0 ka
ISO Topic Category
Data Set Progress
Distribution Media: ftp
Distribution Format: text
Marchitto, T. M., and Wei, K.-Y., 1995. History of Laurentide meltwater flow
to the Gulf of Mexico during the last deglaciation, as revealed by reworked
calcareous nannofossils. Geology, 23: 779-782.
Creation and Review Dates
DIF Creation Date: 2006-12-08
Last DIF Revision Date: 2007-01-30