Daniel J. Frost
University of Montpellier
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Publication
Featured researches published by Daniel J. Frost.
Nature | 2005
David Mainprice; Andréa Tommasi; Hélène Couvy; Patrick Cordier; Daniel J. Frost
The mineral olivine dominates the composition of the Earths upper mantle and hence controls its mechanical behaviour and seismic anisotropy. Experiments at high temperature and moderate pressure, and extensive data on naturally deformed mantle rocks, have led to the conclusion that olivine at upper-mantle conditions deforms essentially by dislocation creep with dominant [100] slip. The resulting crystal preferred orientation has been used extensively to explain the strong seismic anisotropy observed down to 250u2009km depth. The rapid decrease of anisotropy below this depth has been interpreted as marking the transition from dislocation to diffusion creep in the upper mantle. But new high-pressure experiments suggest that dislocation creep also dominates in the lower part of the upper mantle, but with a different slip direction. Here we show that this high-pressure dislocation creep produces crystal preferred orientations resulting in extremely low seismic anisotropy, consistent with seismological observations below 250u2009km depth. These results raise new questions about the mechanical state of the lower part of the upper mantle and its coupling with layers both above and below.
Archive | 2010
David. C. Rubie; Daniel J. Frost; Francis Nimmo; David Patrick O'Brien; Ulrich Mann; H. Palme
Archive | 2007
Astrid Holzheid; Ph. Kegler; Daniel J. Frost; David. C. Rubie; H. Palme
Archive | 2007
David. C. Rubie; Ulrich Mann; Daniel J. Frost; Ph. Kegler; Astrid Holzheid; H. Palme
Archive | 2007
Ulrich Mann; Daniel J. Frost; Harry Becker; David. C. Rubie; Charles K. Shearer; Carl B. Agee
Archive | 2010
Ute Mann; Daniel J. Frost; Harold Becker; Andreas Audétat; David. C. Rubie
Archive | 2010
Alan B. Woodland; Klaus Schollenbruch; Daniel J. Frost; Falko Langenhorst
Archive | 2008
Murli H. Manghnani; Anwar Hushur; Joseph R. Smyth; Fabrizio Nestola; George Amulele; Vitali B. Prakapenka; Daniel J. Frost
Archive | 2011
David. C. Rubie; Daniel J. Frost; H. Palme
Archive | 2010
Yuji Nakajima; Daniel J. Frost; David. C. Rubie