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Oxygen isotope calibration of the onset of ice-rafting and history of glaciation in the North Atlantic region

N. J. Shackleton; J. Backman; H. Zimmerman; Dennis V. Kent; M. A. Hall; D. G. Roberts; D. Schnitker; J. G. Baldauf; A. Desprairies; R. Homrighausen; P. Huddleston; J. B. Keene; A. J. Kaltenback; K. A. O. Krumsiek; A. C. Morton; J. W. Murray; J. Westberg-Smith

Title:
Oxygen isotope calibration of the onset of ice-rafting and history of glaciation in the North Atlantic region
Author(s):
Shackleton, N. J.
Backman, J.
Zimmerman, H.
Kent, Dennis V.
Hall, M. A.
Roberts, D. G.
Schnitker, D.
Baldauf, J. G.
Desprairies, A.
Homrighausen, R.
Huddleston, P.
Keene, J. B.
Kaltenback, A. J.
Krumsiek, K. A. O.
Morton, A. C.
Murray, J. W.
Westberg-Smith, J.
Date:
Type:
Articles
Department:
Lamont-Doherty Earth Observatory
Volume:
307
Permanent URL:
Book/Journal Title:
Nature
Abstract:
We report here that DSDP Site SS2A, cored with the hydraulic piston corer on the west flank of RockaU Bank, recovered an undisturbed sequence of alternating white deep-sea carbonate oozes and dark-coloured layers that are rich in glacial debris. Oxygen isotope analysis of the sequence together with detailed nannofossil and palaeomagnetic stratigraphy shows that the first major horizon of ice-rafting occurred at about 2.4 Myr, and was preceded by a minor pulse of ice-rafting at about 2.5 Myr. The carbon isotope record shows that the site has been bathed by a water mass of similar characteristics to present-day North Atlantic deep water at least since 3.5 Myr.
Subject(s):
Geology
Publisher DOI:
http://dx.doi.org/10.1038/307620a0
Item views:
453
Metadata:
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