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Book Chapter

Migration of Salt-Induced Structures

By
D. Sannemann
D. Sannemann
BEB, Hannover, Federal Republic of Germany
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Published:
January 01, 1983

Abstract

The deformation of sediments overlying a salt layer can result in the buildup of salt pillows, salt domes, and/or elongated salt walls. Depending on the event which triggers the deformation of the salt, different types of rim synclines on the flanks of the salt structures may occur. If the movement is purely halokinetic, the sedimentary cover over a saltpillow will be thinnest over the top, the thickening down the flanks resulting in a wedge-shaped primary rim syncline. in the piercing stage of the salt-dome a secondary rim syncline is formed with its thickest part toward the salt dome because of the salt withdrawal in the area surrounding the dome. If the salt movement is triggered by a tectonic event (e.g., by a displacement of the layers including the salt), usually no primary rim syncline is formed, since there is no salt pillow stage as the salt rises up along the faultplane.

In the Upper Permian Zechstein salt basin of northwest Germany the salt-induced deformation of the sediments is seen in a number of cases to start from a central "mother salt dome" and proceed outward in both directions. The seismic section shows one side of a salt dome "family," with the central salt dome at the righthand side of the profile. The rim synclines become progressively younger from right to left, showing an overlapping of the sediment wedges. The absence of a primary rim syncline points to a tectonic trigger for the generation of the "mother" salt dome.

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Contents

AAPG Studies in Geology

Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces

A. W. Bally
A. W. Bally
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American Association of Petroleum Geologists
Volume
15
ISBN electronic:
9781629810188
Publication date:
January 01, 1983

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