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Possible accumulation of authigenic, expandable-type clay minerals in the substructure of tuttle creek dam, Kansas, U.S.A. |
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| Authors: | DG Brookins |
| Institution: | aDepartment of Geology, University of New Mexico, Albuquerque, N.M. U.S.A. |
| Abstract: | A preliminary review of the literature indicates that the chemistry of the water from relief wells south of Tuttle Creek Dam (T.C.D.) is favorable for the formation of authigenic montmorillonitic and mixed-layer clays whereas the chemistry of the waters of Tuttle Creek Reservoir (T.C.R.) indicates only kaolinite as a possible authigenic phase. The montmorillonitic and mixed-layer clays are very undesirable in a dam's structure due to their ion exchange capacity and swellability-compressibility; both factors can possibly shorten the life of an earthfill dam. Further study indicates that the water chemistry of the relief wells is close to that for many of the wells in the Blue River Valley and Kansas River Valley from below the dam and that this criterion alone cannot be used to answer the critical question of authigenesis. Clay mineralogic study coupled with a Rb-Sr geochronologic study indicates that, despite some real differences in the types of clays found in both T.C.R. and T.C.D., an allogenic origin for the clays is probable. This refutes the idea that the dam is being weakened by authigenic clay deposition, but more chemical date are needed to confirm the Rb-Sr work. |
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