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GRE阅读高频机经原文：冰川沉积物
14. 冰川沉积物
Tills are commonly classi?ed according to the perceived process of deposition. However, it is increasingly recognised that this classi?cation, which is mainly based on macroscopic ?eld data, has severe limitations. At the same time the concept of the deforming glacier bed has become more realistic as a framework for discussing tills and their properties, and this (tectonic) concept is irreconcilable with the existing (depositional) till classi?cation scheme. Over the last 20 years large thin sections have been used to study tills, which has provided new insights into the textural and structural properties of tills. These results have revolutionised till sedimentology as they show that, in the main, subglacial tills possess deformational characteristics. Depositional properties are rare.
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