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The Specific Surface Area Values For Iowa Tills, Keith E. Schilling, Brian L. Gedlinske
The Specific Surface Area Values For Iowa Tills, Keith E. Schilling, Brian L. Gedlinske
Journal of the Iowa Academy of Science: JIAS
Specific surface area is a property used by earth scientists to estimate the proportion of expandable clay minerals in soils. In this study, specific surface area method is shown to compare favorably with standard clay mineralogical techniques in determining gross differences in expandable clay mineral content in tills. The results of over 100 measurements on till samples from Iowa indicate undifferentiated pre-Illinoian tills from southern and southwestern Iowa have the highest specific surface area values of Iowa tills (ranging from nearly 100 to greater than 150 m2/g) and Wisconsinan Dows Formation tills have the lowest average specific surface …