AMS-14C ages measured in deep sea cores from the Southern Ocean : implications for sedimentation rates during isotope stage 2

Auteurs :
BARD, E.
LABEYRIE, L.
ARNOLD, M.
LABRACHERIE, M.
PICHON, J. J.
DUPRAT, J.
DUPLESSY, J. C.

Description :
C14 dates obtained by accelerator mass spectrometry (AMS) on monospecific foraminiferal samples from two deep-sea sediment cores raised in the Indian sector of the southern Ocean have been corrected for the difference in C14 composition between atmosphere and sea surface by using a reconstruction of the latitudinal C14 gradient which existed in the Southern Ocean prior to 1962. The corrected AMS-C14 data show a reduced sedimentation rates in core MD 84-527 between 25,000 and 10,000 yr B.P. For core MD 84-551 the available data suggest that the sedimentation rate was higher during the Holocene than during the glacial period. These changes in sedimentation rates may be attributed to an increased opal dissolution during the last glacial maximum.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 1989, vol. 31, n°. 2, p. 309-317, Références bibliographiques : 41 réf.

Date :
1989

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier