风化作用
石英
地质学
黄土
淤泥
碎屑岩
沉积岩
断裂(地质)
地球化学
粉碎
矿物学
地貌学
岩土工程
材料科学
古生物学
冶金
作者
Ian Smalley,David H. Krinsley,C. F. Moon,Stephen P. Bentley
出处
期刊:Elsevier eBooks
[Elsevier]
日期:1979-01-01
卷期号:: 119-127
被引量:2
标识
DOI:10.1016/b978-0-08-024258-3.50014-x
摘要
Quartz particles are released into the sedimentary system by the weathering and fracture of granitic rocks. These quartz particles contain micorfractures which influence their subsequent breakage. Few fractures means stronger particles which become sand - and then tend to resist fracture. Highly fractured particles break down to become silt and clay sized particles. Silt formation may be locally enhanced by glacial grinding and cold weathering during climatic cold periods - and increased amounts of clay sized material are also produced. Loess deposits tend to form as a result of Quaternary cold periods in which large amounts of source rock were fractured by cold weathering; loess particles are not formed by desert processes. It appears that very sensitive soils may owe their properties to a predominance of clay sized primary mineral particles (quartz making a considerable contribution) and that available processes of fracture are actually the critical controls which allow these quickclays and similar sediments to form. Fracture processes at very small sizes can produce plate shaped particles with virtually undeformed edges; some interesting cleavage processes appear to operate.
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