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- W2046826743 abstract "Previous studies of the surface textures of glacially transported quartz sand grains have rarely distinguished between the influence which quartz grain microstructure and transport history independently exert on the appearance of grains. In this paper we identify two distinct categories of quartz sand grain, both of which can be found in subglacial and supraglacial debris. Translucent grains are derived from monocrystalline quartz which is largely free of dislocation structures, while opaque grains are derived from polycrystalline quartz which displays a wide range of dislocation structures. Whilst subglacially derived grains show no differences, in terms of their angularity, Fourier shape or surface texture, from supraglacially derived grains of the same category, translucent grains from both environments are consistently more angular and less rough than opaque grains and their surfaces are delimited primarily by planar fractures rather than blocky surfaces. These differences in the appearance of translucent and opaque grains appear to reflect the manner in which the process of brittle fracture operates on undeformed and deformed quartz. Microstructure may therefore exert a greater influence on the appearance of glacially transported quartz sand grains than their specific transport history." @default.
- W2046826743 created "2016-06-24" @default.
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- W2046826743 date "1988-05-01" @default.
- W2046826743 modified "2023-09-27" @default.
- W2046826743 title "Microstructural control of quartz sand grain shape and texture: Implications for the discrimination of debris transport pathways through glaciers" @default.
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- W2046826743 doi "https://doi.org/10.1016/0037-0738(88)90021-8" @default.
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