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Slope movements in the Cheshire Quartzite, southwestern Vermont

By
Fitzhugh T. Lee
Fitzhugh T. Lee
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Published:
January 01, 1989

Slope movements in the Lower Cambrian Cheshire Quartzite of the western Green Mountains in Vermont are characterized by block slides, rock falls, and more rarely, by toppling failures. Slides and falls occur on steep hillslopes underlain by massive quartzite, whereas topples are unique to thin-bedded, tectonically deformed quartzite containing interbeds of graphitic schist. Freeze-thaw mechanisms dominate displacements of massive blocks, while rainfall induces toppling displacements. Movement of massive blocks occurs primarily in early spring and late fall.

Bedrock discontinuities, including microfractures, joints, and bedding surfaces, are of primary importance in facilitating initial slope breakup and in controlling the subsequent mode of downslope rock-mass movement. The results of investigations at three sites in the Cheshire-Quartzite show that movement rates are controlled by structural conditions and slope-development patterns. A typical freeze cycle during testing of a physical block model in the laboratory produced a displacement of 0.13 mm, which agrees reasonably well with the 0.26 mm annual displacements measured at two cliff-edge blocks at a rock-fall site. Gravity-induced toppling movements in much less massive quartzite are more rapid.

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GSA Special Papers

Landslide processes of the eastern United States and Puerto Rico

Arthur P. Schultz
Arthur P. Schultz
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Randall W. Jibson
Randall W. Jibson
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Geological Society of America
Volume
236
ISBN print:
9780813722368
Publication date:
January 01, 1989

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