(Table 1) Age determination of sediment cores HU89038_8 and OCE326-GGC5

Models indicate that a complete shutdown of deep and intermediate water production is a possible consequence of extreme climate conditions in the northern North Atlantic, and the high ratio of 231Pa to 230Th on Bermuda Rise is evidence that this might have happened ∼17 ka during Heinrich event 1 (H1...

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Bibliographic Details
Main Authors: Keigwin, Lloyd D, Boyle, Edward A
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
Age
14C AMS
14C calibrated
dated
dated material
dated standard deviation
Bermuda Rise
Calendar age
standard deviation
DEPTH
sediment/rock
Event label
GC
GGC5
Gravity corer
HU89038_8
Laboratory code/label
North Atlantic
OCE326-GGC5
PC
Piston corer
Southern Ocean
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.832421
https://doi.org/10.1594/PANGAEA.832421
Description
Summary:Models indicate that a complete shutdown of deep and intermediate water production is a possible consequence of extreme climate conditions in the northern North Atlantic, and the high ratio of 231Pa to 230Th on Bermuda Rise is evidence that this might have happened ∼17 ka during Heinrich event 1 (H1). However, new radiocarbon data from bivalves that lived at ∼4.6 km on the Bermuda Rise during H1 lead to a different conclusion. The bivalve data do indeed indicate ventilation of the deep western North Atlantic was suppressed during H1 but not as much as it was during the last glacial maximum. We propose that high diatom flux to the Bermuda Rise during H1 is at least in part responsible for increased 231Pa/230Th at that time. Although we cannot say for sure why opal production was so high in a gyre center location at that time, increased leakage of silica rich waters from the Southern Ocean to the North Atlantic is one possibility.

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