Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by BHATTACHARYA, N Search for Related Content GeoRef GeoRef Citation

Weathering of Glacial Tills in Indiana I. Clay Minerals

Dept. Geology, Indiana University, Bloomington, Ind

X-ray diffraction data indicate that profiles developed on Wisconsin, Illinoian, and Kansan tills in Indiana differ from each other with respect to the stages attained in clay-mineral alteration. The post-Wisconsin weathering profile is distinctly different from the buried profiles on Illinoian and Kansan tills, but the differences are not quite so great between the weathering profiles developed during the Sangamon age on Illinoian tills and those of Yarmouth age on Kansan tills.

Hydration and ionic exchanges produce major changes in clay-mineral alteration, but oxidation, hydrolysis, polymerization, and recrystallization also play significant roles. The final alteration products of clay minerals are determined by the composition of the original clay and the duration of alteration.