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Milankovitch-paced Termination II in a Nevada speleothem?

Shakun, Jeremy D., Burns, Stephen J., Clark, Peter U, Cheng, Hai and Edwards, R. Lawrence (2011) Milankovitch-paced Termination II in a Nevada speleothem? GEOPHYSICAL RESEARCH LETTERS, 38 . L18701. [Journal article]

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DOI: 10.1029/2011GL048560

Abstract

The Devils Hole (DH) calcite record from the Great Basin, Nevada, provided the first radiometrically dated time series of late-Pleistocene climate fluctuations,. In doing so, DH suggested that the penultimate deglaciation, Termination II (T-II), occurred at 142 ± 3 ka, which is ∼10 kyr before the associated rise in summer insolation, helping to launch the “causality problem” for Milankovitch. The interpretation of the DH record has been subject to considerable discussion ever since. We present the first attempt to reproduce the DH record of an early T-II in the Great Basin based on a stalagmite from Lehman Caves, Nevada, which is ∼400 km northeast of Devils Hole. Our speleothem records at least the latter part of T-II over its period of growth from ∼133–129 ka, which appears to disagree with the early timing of T-II in DH. DH also exhibits important differences from many other paleoclimate records over the past two deglaciations, though these are reduced somewhat after ice-volume correcting DH δ18O. We suggest that the climatic signal in the DH record remains to be fully explained.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute > Quaternary Environmental Change
Environmental Sciences Research Institute
ID Code:27120
Deposited By: Mrs Linda Allen
Deposited On:29 Sep 2013 08:26
Last Modified:29 Sep 2013 08:26

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