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Book Chapter

Interpretation of Faults in Glaciofluvial Sediments

By
Barrie C. McDonald
Barrie C. McDonald
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;
William W. Shilts
William W. Shilts
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Published:
January 01, 1975

Abstract

Faults in glaciofluvial sediments are interpreted in the light of the experimental work of Sanford (1959). Internal displacements in the sedimentary sequence resulted from the melting of associated ice. Field examples are used to illustrate that (a) melting of a discrete buried ice mass will produce a downthrown block of sediment bounded by high-angle reverse faults that are convex upwards; (b) melting the ice walls that supported an esker of subglacial origin will result in high-angle reverse faults, concentrated in the flank of the esker, that strike parallel to the esker ridge and dip steeply in toward the esker axis; such walls probably were not vertical but, rather, dipped inward toward the esker axis; and (c) large normal faults may be related to deposition over a saucer-shaped ice base. Minor normal faults may complement high-angle reverse fault systems in (a) and (b). The scale, type, and distribution of faults, and the orientation of faults with respect to the sediment body and to paleocurrent directions can contribute to a reconstruction of the sedimentation environment. These data provide useful criteria for identification of fluvial sediments as glaciofluvial.

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SEPM Special Publication

Glaciofluvial and Glaciolacustrine Sedimentation

Alan V. Jopling
Alan V. Jopling
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;
Barrie C. McDonald
Barrie C. McDonald
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SEPM Society for Sedimentary Geology
Volume
23
ISBN electronic:
9781565761537
Publication date:
January 01, 1975

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