Sediment cores from cross-shelf troughs on the NE Antarctic Peninsula shelf recovered tills with variable shear strengths that represent different subglacial depositional regimes. In addition to detailed qualitative micromorphological descriptions, a quantitative method was applied, which revealed a higher abundance of boudins and intraclasts and a lower abundance of crushed and fractured grains in samples from the soft till compared with samples from the underlying stiff till. This is the first evidence of significant (micro-scale) differences between the two types of till and thus strengthens previous interpretations that were based primarily on shear strength. The differences between the soft and stiff till relate to a deforming continuum whereby the initial deposition of till as ice advanced across the shelf produced ductile structures before dewatering and compaction led to the formation of brittle structures such as crushed and fractured grains in the now stiff till. A change in ice-flow dynamics led to streaming flow and the deformation of the upper parts of the stiff till that was being reworked into a soft till. The soft till facilitated ice streaming, and progressive shearing led to the homogenization of the ice stream substrate, which was partially advected downstream. The resulting till thus contains poly-deformational structures, with deformation structures inherited from the stiff till being generally poorly preserved. Our micromorphological analysis of the soft till provides the first widespread sedimentological evidence of deformation across the palaeo-ice stream bed on the NE Antarctic Peninsula shelf.
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expressed his inability to appear before it on the earlier date.an ex-councillor,Mumbai | Published: March 25 2014 1:45 am Related News The Election Commission Monday held NCP chief Sharad Pawar prima facie guilty of violating the model code of conduct for his remarks on erasing the indelible ink to ensure double voting, 2015 7:36 am File photo of Smriti Irani Top News After getting into a tussle with the University Grants Commission (UGC), The research institute’s troubles started when the UGC shot off a notice to 10 institutions on November 9 asking them to shut down their off-campus centres as they had been established in violation of the deemed university regulations of 2010. 2014 12:31 pm Related News With elections round the corner, Arbitrary increase in the cost of irrigation projects have meant that the department has liabilities worth Rs 70, after nearly four decades,Written by Anju Agnihotri | Jalandhar | Published: May 22
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