| Clay-rich products of hydrothermal alteration occur in much of the debris in and around vent areas on the upper slopes of Mount Baker, Washington. Similar material is also present at the base of the volcano in some of the deposits that resulted from large mass movements such as mudflows and avalanches. I undertook this reconnaissance study to assess the possibility that clay-forming processes, particularly hydrothermal alteration, can affect the source, magnitude, and frequency of large volcanic mudflows and avalanches. -- Frank, 1983 |
