新GRE阅读全真题：冰川沉积物.

　　新GRE考试非常人性的一点，对于考题出的很严格，经过多次锤炼之后，能考验出考生们的水平。考生们可以根据题库的题目复习新GRE考试，下面就将新GRE阅读理解真题进行解析，为考生们彻底分析在GRE阅读中出现的真题，帮助考生们复习。

　　14. 冰川沉积物

　　Tills are commonly classified according to the perceived process of deposition. However, it is increasingly recognised that this classification, which is mainly based on macroscopic field data, has severe limitations. At the same time the concept of the dorming 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 classification 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 dormational characteristics. Depositional properties are rare. Based on this new insight the process of subglacial till formation is discussed in terms of glacier/ice sheet basal velocity, clay, water and carbonate content and the variability of these properties in space and time. The end result of this discussion is: till, the dorming glacier bed. To distinguish subglacial till from depositional sediments the term ‘tectomict’ is proposed. Within the single framework of subglacial till as the dorming glacier bed, many textural, structural and geomorphological features of till beds can be more clearly and coherently explained and understood.

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