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- W2335281330 abstract "Abstract An in-depth analysis of seven samples from the Siple Dome (Antarctica) ice core, using optical microscopy and electron backscatter diffraction, illustrates rotational recrystallization or polygonization in the fine-grained region of the core between 700 and 800 m. Between 640 and 700 m, the microstructure is characterized by a bimodal grain-size distribution and a broken girdle fabric with evidence of polygonization. From 727 to 770 m, mean grain size decreases and a single-maximum fabric is found, and, by 790 m, mean grain size has again increased and a multiple-maxima fabric manifests itself. We compare grain-size distribution, c - and a -axis orientation, and misorientation between adjacent grains. We found that misorientations between adjacent grains in the 727–770 m region were predominantly low-angle and typically around a common a -axis, suggesting polygonization. This conclusion is supported by radar evidence of a physical disturbance at 757 m, which may be correlated with higher than usual strain in the 700–800 m range. Below 770 m, larger less regular misorientations and textural evidence show that migration recrystallization is the primary recrystallization mechanism." @default.
- W2335281330 created "2016-06-24" @default.
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- W2335281330 date "2011-01-01" @default.
- W2335281330 modified "2023-09-23" @default.
- W2335281330 title "Microstructural evolution in the fine-grained region of the Siple Dome (Antarctica) ice core" @default.
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- W2335281330 doi "https://doi.org/10.3189/002214311798843322" @default.
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