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dc.contributorNational Science Foundation (U.S.). Office of Antarctic Programs.-
dc.contributor.authorGow, A. J. (Anthony Jack)-
dc.descriptionResearch Report-
dc.descriptionAbstract: Radical differences in the crystal structure and fabrics of glacier ice cores at Byrd Station and Little America V, Antarctica, are attributed to gross differences in the thermal and deformational histories of the ice at these two locations. At Byrd Station the mean size of crystals increased more than sixfold between 65 m and the bottom of the drill hole at 309 m. Crystal size was also found to increase linearly with the age of the ice, thus simulating isothermal grain growth in metals. However, this growth was not accompanied by any dimensional orientation of crystals or entrapped bubbles, or by any significant increase in the degree of preferred orientation of crystallographic c-axes. These observations imply that negligible shearing is occurring in the top 300 m of the thick grounded ice sheet at Byrd Station. By contrast very considerable deformation is indicated for the floating 258-m-thick Ross Ice Shelf at Little America. This deformation is characterized by the widespread occurrence of "strained" crystals below 65 m, the existence of elongated oriented bubbles between 95 m and 130 m and the attainment of pronounced crystal orientation (multiple-maxima fabrics) by 100-m depth. Exaggerated growth of crystals below 150 m is attributed to increasing temperatures in the ice shelf. The crystal structure of these cores clearly demonstrates that glacial ice only is present in the Ross Ice Shelf at Little America V.-
dc.publisherCold Regions Research and Engineering Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesResearch report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 282.-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans-
dc.subjectByrd Station-
dc.subjectLittle America V-
dc.subjectGlacier ice-
dc.subjectIce cores-
dc.subjectIce crystal growth-
dc.subjectIce crystal structure-
dc.subjectIce deformation-
dc.subjectIce fabrics-
dc.titleDeep core studies of the crystal structure and fabrics of Antarctic glacier ice-
Appears in Collections:Research Report

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