“till”的概念、定义、翻译、参考文献-科学参考

till

Geology and Earth Sciences

Collective term for the group of sediments laid down by the direct action of glacial ice without the intervention of water. The sediments may be classified in terms of particle size (they range between clay-rich and clast-dominated types, according to source area and travel distance), or grouped by the basic process of debris release: subglacial melt gives rise to ‘lodgement till’; surface ablation gives ‘ablation till’, followed by flow till after further movement; and the general thaw of static ice produces ‘melt-out till’. See till fabric analysis.

Geography

The sediment deposited directly below a glacier, which exhibits a wide range of particle sizes, from fine clay to rock fragments and boulders. The rate of till flow beneath a glacier is thought to depend on basal shear stress and on the effective pressure, defined as the difference between overburden pressure and the interstitial pore water pressure within the sediments. See Evans et al. (2006) Earth Sci. Revs 78, 1–2. Where glaciers overlie soft sediments, deformation may rearrange and reorientate particles to form deformation till, and the examination of these tills can reveal structures that allow the strain history to be reconstructed. See Murray (2012) in J. Holden, ed., p. 490.

单词	till
释义	till Geology and Earth Sciences Collective term for the group of sediments laid down by the direct action of glacial ice without the intervention of water. The sediments may be classified in terms of particle size (they range between clay-rich and clast-dominated types, according to source area and travel distance), or grouped by the basic process of debris release: subglacial melt gives rise to ‘lodgement till’; surface ablation gives ‘ablation till’, followed by flow till after further movement; and the general thaw of static ice produces ‘melt-out till’. See till fabric analysis. Geography The sediment deposited directly below a glacier, which exhibits a wide range of particle sizes, from fine clay to rock fragments and boulders. The rate of till flow beneath a glacier is thought to depend on basal shear stress and on the effective pressure, defined as the difference between overburden pressure and the interstitial pore water pressure within the sediments. See Evans et al. (2006) Earth Sci. Revs 78, 1–2. Where glaciers overlie soft sediments, deformation may rearrange and reorientate particles to form deformation till, and the examination of these tills can reveal structures that allow the strain history to be reconstructed. See Murray (2012) in J. Holden, ed., p. 490.
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