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Sökning: WFRF:(Fitzsimons D) > Naturvetenskap

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1.
  • Li, Z. X., et al. (författare)
  • How not to build a supercontinent: A reply to JDA Piper
  • 2009
  • Ingår i: Precambrian Research. - : Elsevier BV. - 0301-9268. ; 174:1-2, s. 208-214
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The hypothesized existence of a Neoproterozoic supercontinent called Rodinia is based on a series of geological and paleomagnetic observations, with details about the configuration and evolution of this supercontinent still a matter for debate. Regrettably, we found that the comment by Piper (this volume) lacks scientific objectiveness. The 'Palaeopangaea' that he promotes is, in our view, based on incorrect application of paleomagnetic data, and is not supported by geological evidence. (C) 2009 Elsevier B.V. All rights reserved.
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2.
  • Samyn, Denis, et al. (författare)
  • Rotating micro-structures in Antarctic cold basal ice : implications for glacier flow and its interpretation
  • 2010
  • Ingår i: International journal of earth sciences. - : Springer Science and Business Media LLC. - 1437-3254 .- 1437-3262. ; 99:8, s. 1849-1857
  • Tidskriftsartikel (refereegranskat)abstract
    • Structural analyses were conducted in the basal zone of an Antarctic glacier The studied basal ice sequence was retrieved from a 20-m-long subglacial tunnel dug at the margin of the glacier and is at the temperature of -17 degrees C For the first time, rotating clast systems embedded within debris-rich ice were thin-sectioned using specially designed cutting techniques The observed structures reflect the occurrence of pervasive shearing at the base of the glacier, and can be used as shear sense indicators In addition, some of these structures provide evidence for the presence of thin liquid films at the time of formation despite the marked freezing temperature of the ice It is showed here that cautious analysis of deformation structures present in debris-bearing ice may bring insights not only into the flow dynamics of the embedding matrix, but also Into the behaviour of the interstitial fluid network at the base of cold glaciers and ice sheets.
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